mirror of https://github.com/ipxe/ipxe.git
581 lines
15 KiB
C
581 lines
15 KiB
C
#ifndef _GPXE_DHCP_H
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#define _GPXE_DHCP_H
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/** @file
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*
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* Dynamic Host Configuration Protocol
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*
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*/
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#include <stdint.h>
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#include <gpxe/in.h>
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#include <gpxe/list.h>
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#include <gpxe/refcnt.h>
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#include <gpxe/tables.h>
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#include <gpxe/uuid.h>
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#include <gpxe/netdevice.h>
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struct job_interface;
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struct dhcp_options;
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struct dhcp_packet;
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/** BOOTP/DHCP server port */
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#define BOOTPS_PORT 67
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/** BOOTP/DHCP client port */
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#define BOOTPC_PORT 68
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/** PXE server port */
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#define PXE_PORT 4011
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/** Construct a tag value for an encapsulated option
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*
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* This tag value can be passed to Etherboot functions when searching
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* for DHCP options in order to search for a tag within an
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* encapsulated options block.
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*/
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#define DHCP_ENCAP_OPT( encapsulator, encapsulated ) \
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( ( (encapsulator) << 8 ) | (encapsulated) )
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/** Extract encapsulating option block tag from encapsulated tag value */
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#define DHCP_ENCAPSULATOR( encap_opt ) ( (encap_opt) >> 8 )
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/** Extract encapsulated option tag from encapsulated tag value */
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#define DHCP_ENCAPSULATED( encap_opt ) ( (encap_opt) & 0xff )
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/** Option is encapsulated */
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#define DHCP_IS_ENCAP_OPT( opt ) DHCP_ENCAPSULATOR( opt )
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/**
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* @defgroup dhcpopts DHCP option tags
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* @{
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*/
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/** Padding
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*
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* This tag does not have a length field; it is always only a single
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* byte in length.
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*/
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#define DHCP_PAD 0
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/** Minimum normal DHCP option */
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#define DHCP_MIN_OPTION 1
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/** Subnet mask */
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#define DHCP_SUBNET_MASK 1
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/** Routers */
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#define DHCP_ROUTERS 3
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/** DNS servers */
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#define DHCP_DNS_SERVERS 6
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/** Syslog servers */
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#define DHCP_LOG_SERVERS 7
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/** Host name */
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#define DHCP_HOST_NAME 12
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/** Domain name */
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#define DHCP_DOMAIN_NAME 15
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/** Root path */
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#define DHCP_ROOT_PATH 17
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/** Vendor encapsulated options */
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#define DHCP_VENDOR_ENCAP 43
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/** PXE boot server multicast address */
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#define DHCP_PXE_BOOT_SERVER_MCAST DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 7 )
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/** PXE boot menu */
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#define DHCP_PXE_BOOT_MENU DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 9 )
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/** PXE boot menu */
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struct dhcp_pxe_boot_menu {
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/** "Type" */
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uint16_t type;
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/** Description length */
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uint8_t desc_len;
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/** Description */
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char desc[0];
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} __attribute__ (( packed ));
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/** PXE boot menu prompt */
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#define DHCP_PXE_BOOT_MENU_PROMPT DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 10 )
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/** PXE boot menu prompt */
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struct dhcp_pxe_boot_menu_prompt {
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/** Timeout
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*
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* A value of 0 means "time out immediately and select first
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* boot item, without displaying the prompt". A value of 255
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* means "display menu immediately with no timeout". Any
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* other value means "display prompt, wait this many seconds
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* for keypress, if key is F8, display menu, otherwise select
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* first boot item".
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*/
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uint8_t timeout;
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/** Prompt to press F8 */
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char prompt[0];
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} __attribute__ (( packed ));
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/** PXE boot menu item */
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#define DHCP_PXE_BOOT_MENU_ITEM DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 71 )
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/** PXE boot menu item */
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struct dhcp_pxe_boot_menu_item {
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/** "Type"
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*
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* This field actually identifies the specific boot server (or
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* cluster of boot servers offering identical boot files).
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*/
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uint16_t type;
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/** "Layer"
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*
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* Just don't ask.
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*/
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uint16_t layer;
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} __attribute__ (( packed ));
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/** Requested IP address */
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#define DHCP_REQUESTED_ADDRESS 50
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/** Lease time */
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#define DHCP_LEASE_TIME 51
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/** Option overloading
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*
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* The value of this option is the bitwise-OR of zero or more
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* DHCP_OPTION_OVERLOAD_XXX constants.
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*/
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#define DHCP_OPTION_OVERLOAD 52
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/** The "file" field is overloaded to contain extra DHCP options */
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#define DHCP_OPTION_OVERLOAD_FILE 1
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/** The "sname" field is overloaded to contain extra DHCP options */
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#define DHCP_OPTION_OVERLOAD_SNAME 2
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/** DHCP message type */
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#define DHCP_MESSAGE_TYPE 53
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#define DHCPNONE 0
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#define DHCPDISCOVER 1
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#define DHCPOFFER 2
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#define DHCPREQUEST 3
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#define DHCPDECLINE 4
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#define DHCPACK 5
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#define DHCPNAK 6
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#define DHCPRELEASE 7
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#define DHCPINFORM 8
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/** DHCP server identifier */
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#define DHCP_SERVER_IDENTIFIER 54
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/** Parameter request list */
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#define DHCP_PARAMETER_REQUEST_LIST 55
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/** Maximum DHCP message size */
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#define DHCP_MAX_MESSAGE_SIZE 57
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/** Vendor class identifier */
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#define DHCP_VENDOR_CLASS_ID 60
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/** Client identifier */
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#define DHCP_CLIENT_ID 61
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/** Client identifier */
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struct dhcp_client_id {
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/** Link-layer protocol */
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uint8_t ll_proto;
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/** Link-layer address */
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uint8_t ll_addr[MAX_LL_ADDR_LEN];
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} __attribute__ (( packed ));
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/** TFTP server name
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*
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* This option replaces the fixed "sname" field, when that field is
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* used to contain overloaded options.
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*/
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#define DHCP_TFTP_SERVER_NAME 66
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/** Bootfile name
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*
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* This option replaces the fixed "file" field, when that field is
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* used to contain overloaded options.
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*/
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#define DHCP_BOOTFILE_NAME 67
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/** Client system architecture */
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#define DHCP_CLIENT_ARCHITECTURE 93
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/** Client network device interface */
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#define DHCP_CLIENT_NDI 94
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/** UUID client identifier */
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#define DHCP_CLIENT_UUID 97
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/** UUID client identifier */
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struct dhcp_client_uuid {
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/** Identifier type */
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uint8_t type;
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/** UUID */
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union uuid uuid;
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} __attribute__ (( packed ));
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#define DHCP_CLIENT_UUID_TYPE 0
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/** Etherboot-specific encapsulated options
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*
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* This encapsulated options field is used to contain all options
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* specific to Etherboot (i.e. not assigned by IANA or other standards
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* bodies).
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*/
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#define DHCP_EB_ENCAP 175
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/** Priority of this options block
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*
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* This is a signed 8-bit integer field indicating the priority of
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* this block of options. It can be used to specify the relative
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* priority of multiple option blocks (e.g. options from non-volatile
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* storage versus options from a DHCP server).
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*/
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#define DHCP_EB_PRIORITY DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x01 )
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/** "Your" IP address
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*
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* This option is used internally to contain the value of the "yiaddr"
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* field, in order to provide a consistent approach to storing and
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* processing options. It should never be present in a DHCP packet.
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*/
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#define DHCP_EB_YIADDR DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x02 )
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/** "Server" IP address
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*
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* This option is used internally to contain the value of the "siaddr"
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* field, in order to provide a consistent approach to storing and
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* processing options. It should never be present in a DHCP packet.
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*/
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#define DHCP_EB_SIADDR DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x03 )
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/** Keep SAN drive registered
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*
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* If set to a non-zero value, gPXE will not detach any SAN drive
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* after failing to boot from it. (This option is required in order
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* to perform a Windows Server 2008 installation direct to an iSCSI
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* target.)
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*/
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#define DHCP_EB_KEEP_SAN DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x08 )
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/*
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* Tags in the range 0x10-0x7f are reserved for feature markers
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*
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*/
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/** Skip PXE DHCP protocol extensions such as ProxyDHCP
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*
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* If set to a non-zero value, gPXE will not wait for ProxyDHCP offers
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* and will ignore any PXE-specific DHCP options that it receives.
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*/
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#define DHCP_EB_NO_PXEDHCP DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb0 )
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/** Network device descriptor
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*
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* Byte 0 is the bus type ID; remaining bytes depend on the bus type.
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*
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* PCI devices:
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* Byte 0 : 1 (PCI)
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* Byte 1 : PCI vendor ID MSB
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* Byte 2 : PCI vendor ID LSB
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* Byte 3 : PCI device ID MSB
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* Byte 4 : PCI device ID LSB
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*/
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#define DHCP_EB_BUS_ID DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb1 )
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/** Network device descriptor */
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struct dhcp_netdev_desc {
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/** Bus type ID */
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uint8_t type;
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/** Vendor ID */
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uint16_t vendor;
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/** Device ID */
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uint16_t device;
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} __attribute__ (( packed ));
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/** BIOS drive number
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*
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* This is the drive number for a drive emulated via INT 13. 0x80 is
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* the first hard disk, 0x81 is the second hard disk, etc.
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*/
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#define DHCP_EB_BIOS_DRIVE DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbd )
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/** Username
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*
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* This will be used as the username for any required authentication.
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* It is expected that this option's value will be held in
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* non-volatile storage, rather than transmitted as part of a DHCP
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* packet.
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*/
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#define DHCP_EB_USERNAME DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbe )
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/** Password
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*
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* This will be used as the password for any required authentication.
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* It is expected that this option's value will be held in
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* non-volatile storage, rather than transmitted as part of a DHCP
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* packet.
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*/
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#define DHCP_EB_PASSWORD DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbf )
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/** Reverse username
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*
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* This will be used as the reverse username (i.e. the username
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* provided by the server) for any required authentication. It is
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* expected that this option's value will be held in non-volatile
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* storage, rather than transmitted as part of a DHCP packet.
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*/
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#define DHCP_EB_REVERSE_USERNAME DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xc0 )
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/** Reverse password
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*
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* This will be used as the reverse password (i.e. the password
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* provided by the server) for any required authentication. It is
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* expected that this option's value will be held in non-volatile
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* storage, rather than transmitted as part of a DHCP packet.
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*/
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#define DHCP_EB_REVERSE_PASSWORD DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xc1 )
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/** gPXE version number */
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#define DHCP_EB_VERSION DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xeb )
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/** iSCSI primary target IQN */
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#define DHCP_ISCSI_PRIMARY_TARGET_IQN 201
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/** iSCSI secondary target IQN */
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#define DHCP_ISCSI_SECONDARY_TARGET_IQN 202
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/** iSCSI initiator IQN */
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#define DHCP_ISCSI_INITIATOR_IQN 203
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/** Maximum normal DHCP option */
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#define DHCP_MAX_OPTION 254
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/** End of options
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*
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* This tag does not have a length field; it is always only a single
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* byte in length.
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*/
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#define DHCP_END 255
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/** @} */
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/**
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* Count number of arguments to a variadic macro
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*
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* This rather neat, non-iterative solution is courtesy of Laurent
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* Deniau.
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*
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*/
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#define _VA_ARG_COUNT( _1, _2, _3, _4, _5, _6, _7, _8, \
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_9, _10, _11, _12, _13, _14, _15, _16, \
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_17, _18, _19, _20, _21, _22, _23, _24, \
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_25, _26, _27, _28, _29, _30, _31, _32, \
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_33, _34, _35, _36, _37, _38, _39, _40, \
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_41, _42, _43, _44, _45, _46, _47, _48, \
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_49, _50, _51, _52, _53, _54, _55, _56, \
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_57, _58, _59, _60, _61, _62, _63, N, ... ) N
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#define VA_ARG_COUNT( ... ) \
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_VA_ARG_COUNT ( __VA_ARGS__, \
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63, 62, 61, 60, 59, 58, 57, 56, \
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55, 54, 53, 52, 51, 50, 49, 48, \
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47, 46, 45, 44, 43, 42, 41, 40, \
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39, 38, 37, 36, 35, 34, 33, 32, \
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31, 30, 29, 28, 27, 26, 25, 24, \
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23, 22, 21, 20, 19, 18, 17, 16, \
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15, 14, 13, 12, 11, 10, 9, 8, \
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7, 6, 5, 4, 3, 2, 1, 0 )
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/** Construct a DHCP option from a list of bytes */
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#define DHCP_OPTION( ... ) VA_ARG_COUNT ( __VA_ARGS__ ), __VA_ARGS__
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/** Construct a DHCP option from a list of characters */
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#define DHCP_STRING( ... ) DHCP_OPTION ( __VA_ARGS__ )
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/** Construct a byte-valued DHCP option */
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#define DHCP_BYTE( value ) DHCP_OPTION ( value )
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/** Construct a word-valued DHCP option */
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#define DHCP_WORD( value ) DHCP_OPTION ( ( ( (value) >> 8 ) & 0xff ), \
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( ( (value) >> 0 ) & 0xff ) )
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/** Construct a dword-valued DHCP option */
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#define DHCP_DWORD( value ) DHCP_OPTION ( ( ( (value) >> 24 ) & 0xff ), \
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( ( (value) >> 16 ) & 0xff ), \
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( ( (value) >> 8 ) & 0xff ), \
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( ( (value) >> 0 ) & 0xff ) )
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/** Construct a DHCP encapsulated options field */
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#define DHCP_ENCAP( ... ) DHCP_OPTION ( __VA_ARGS__, DHCP_END )
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/**
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* A DHCP option
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*
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* DHCP options consist of a mandatory tag, a length field that is
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* mandatory for all options except @c DHCP_PAD and @c DHCP_END, and a
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* payload.
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*/
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struct dhcp_option {
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/** Tag
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*
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* Must be a @c DHCP_XXX value.
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*/
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uint8_t tag;
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/** Length
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*
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* This is the length of the data field (i.e. excluding the
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* tag and length fields). For the two tags @c DHCP_PAD and
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* @c DHCP_END, the length field is implicitly zero and is
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* also missing, i.e. these DHCP options are only a single
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* byte in length.
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*/
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uint8_t len;
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/** Option data */
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uint8_t data[0];
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} __attribute__ (( packed ));
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/**
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* Length of a DHCP option header
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*
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* The header is the portion excluding the data, i.e. the tag and the
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* length.
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*/
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#define DHCP_OPTION_HEADER_LEN ( offsetof ( struct dhcp_option, data ) )
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/** Maximum length for a single DHCP option */
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#define DHCP_MAX_LEN 0xff
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/**
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* A DHCP header
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*
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*/
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struct dhcphdr {
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/** Operation
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*
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* This must be either @c BOOTP_REQUEST or @c BOOTP_REPLY.
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*/
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uint8_t op;
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/** Hardware address type
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*
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* This is an ARPHRD_XXX constant. Note that ARPHRD_XXX
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* constants are nominally 16 bits wide; this could be
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* considered to be a bug in the BOOTP/DHCP specification.
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*/
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uint8_t htype;
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/** Hardware address length */
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uint8_t hlen;
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/** Number of hops from server */
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uint8_t hops;
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/** Transaction ID */
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uint32_t xid;
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/** Seconds since start of acquisition */
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uint16_t secs;
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/** Flags */
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uint16_t flags;
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/** "Client" IP address
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*
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* This is filled in if the client already has an IP address
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* assigned and can respond to ARP requests.
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*/
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struct in_addr ciaddr;
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/** "Your" IP address
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*
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* This is the IP address assigned by the server to the client.
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*/
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struct in_addr yiaddr;
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/** "Server" IP address
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*
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* This is the IP address of the next server to be used in the
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* boot process.
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*/
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struct in_addr siaddr;
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/** "Gateway" IP address
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*
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* This is the IP address of the DHCP relay agent, if any.
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*/
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struct in_addr giaddr;
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/** Client hardware address */
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uint8_t chaddr[16];
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/** Server host name (null terminated)
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*
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* This field may be overridden and contain DHCP options
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*/
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char sname[64];
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/** Boot file name (null terminated)
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*
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* This field may be overridden and contain DHCP options
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*/
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char file[128];
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/** DHCP magic cookie
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*
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* Must have the value @c DHCP_MAGIC_COOKIE.
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*/
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uint32_t magic;
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/** DHCP options
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*
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* Variable length; extends to the end of the packet. Minimum
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* length (for the sake of sanity) is 1, to allow for a single
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* @c DHCP_END tag.
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*/
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uint8_t options[0];
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};
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|
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/** Opcode for a request from client to server */
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#define BOOTP_REQUEST 1
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|
|
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/** Opcode for a reply from server to client */
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#define BOOTP_REPLY 2
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|
|
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/** BOOTP reply must be broadcast
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*
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* Clients that cannot accept unicast BOOTP replies must set this
|
|
* flag.
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|
*/
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#define BOOTP_FL_BROADCAST 0x8000
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|
|
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/** DHCP magic cookie */
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#define DHCP_MAGIC_COOKIE 0x63825363UL
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|
|
|
/** DHCP minimum packet length
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|
*
|
|
* This is the mandated minimum packet length that a DHCP participant
|
|
* must be prepared to receive.
|
|
*/
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|
#define DHCP_MIN_LEN 552
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|
|
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/** Timeouts for sending DHCP packets */
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|
#define DHCP_MIN_TIMEOUT ( 1 * TICKS_PER_SEC )
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|
#define DHCP_MAX_TIMEOUT ( 10 * TICKS_PER_SEC )
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|
|
|
/** Maximum time that we will wait for ProxyDHCP responses */
|
|
#define PROXYDHCP_MAX_TIMEOUT ( 2 * TICKS_PER_SEC )
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|
|
|
/** Settings block name used for DHCP responses */
|
|
#define DHCP_SETTINGS_NAME "dhcp"
|
|
|
|
/** Settings block name used for ProxyDHCP responses */
|
|
#define PROXYDHCP_SETTINGS_NAME "proxydhcp"
|
|
|
|
/** Setting block name used for BootServerDHCP responses */
|
|
#define PXEBS_SETTINGS_NAME "pxebs"
|
|
|
|
extern int dhcp_create_packet ( struct dhcp_packet *dhcppkt,
|
|
struct net_device *netdev, uint8_t msgtype,
|
|
const void *options, size_t options_len,
|
|
void *data, size_t max_len );
|
|
extern int dhcp_create_request ( struct dhcp_packet *dhcppkt,
|
|
struct net_device *netdev,
|
|
unsigned int msgtype, struct in_addr ciaddr,
|
|
void *data, size_t max_len );
|
|
extern int start_dhcp ( struct job_interface *job, struct net_device *netdev );
|
|
extern int start_pxebs ( struct job_interface *job, struct net_device *netdev,
|
|
struct in_addr pxe_server, unsigned int pxe_type );
|
|
|
|
#endif /* _GPXE_DHCP_H */
|