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dhcp.h 16KB

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  1. #ifndef _GPXE_DHCP_H
  2. #define _GPXE_DHCP_H
  3. /** @file
  4. *
  5. * Dynamic Host Configuration Protocol
  6. *
  7. */
  8. #include <stdint.h>
  9. #include <gpxe/in.h>
  10. #include <gpxe/list.h>
  11. #include <gpxe/refcnt.h>
  12. #include <gpxe/tables.h>
  13. #include <gpxe/uuid.h>
  14. #include <gpxe/netdevice.h>
  15. struct job_interface;
  16. struct dhcp_options;
  17. struct dhcp_packet;
  18. /** BOOTP/DHCP server port */
  19. #define BOOTPS_PORT 67
  20. /** BOOTP/DHCP client port */
  21. #define BOOTPC_PORT 68
  22. /** PXE server port */
  23. #define PXE_PORT 4011
  24. /** Construct a tag value for an encapsulated option
  25. *
  26. * This tag value can be passed to Etherboot functions when searching
  27. * for DHCP options in order to search for a tag within an
  28. * encapsulated options block.
  29. */
  30. #define DHCP_ENCAP_OPT( encapsulator, encapsulated ) \
  31. ( ( (encapsulator) << 8 ) | (encapsulated) )
  32. /** Extract encapsulating option block tag from encapsulated tag value */
  33. #define DHCP_ENCAPSULATOR( encap_opt ) ( (encap_opt) >> 8 )
  34. /** Extract encapsulated option tag from encapsulated tag value */
  35. #define DHCP_ENCAPSULATED( encap_opt ) ( (encap_opt) & 0xff )
  36. /** Option is encapsulated */
  37. #define DHCP_IS_ENCAP_OPT( opt ) DHCP_ENCAPSULATOR( opt )
  38. /**
  39. * @defgroup dhcpopts DHCP option tags
  40. * @{
  41. */
  42. /** Padding
  43. *
  44. * This tag does not have a length field; it is always only a single
  45. * byte in length.
  46. */
  47. #define DHCP_PAD 0
  48. /** Minimum normal DHCP option */
  49. #define DHCP_MIN_OPTION 1
  50. /** Subnet mask */
  51. #define DHCP_SUBNET_MASK 1
  52. /** Routers */
  53. #define DHCP_ROUTERS 3
  54. /** DNS servers */
  55. #define DHCP_DNS_SERVERS 6
  56. /** Syslog servers */
  57. #define DHCP_LOG_SERVERS 7
  58. /** Host name */
  59. #define DHCP_HOST_NAME 12
  60. /** Domain name */
  61. #define DHCP_DOMAIN_NAME 15
  62. /** Root path */
  63. #define DHCP_ROOT_PATH 17
  64. /** Vendor encapsulated options */
  65. #define DHCP_VENDOR_ENCAP 43
  66. /** PXE boot server discovery control */
  67. #define DHCP_PXE_DISCOVERY_CONTROL DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 6 )
  68. /** PXE boot server discovery control bits */
  69. enum dhcp_pxe_discovery_control {
  70. /** Inhibit broadcast discovery */
  71. PXEBS_NO_BROADCAST = 1,
  72. /** Inhibit multicast discovery */
  73. PXEBS_NO_MULTICAST = 2,
  74. /** Accept only servers in DHCP_PXE_BOOT_SERVERS list */
  75. PXEBS_NO_UNKNOWN_SERVERS = 4,
  76. /** Skip discovery if filename present */
  77. PXEBS_SKIP = 8,
  78. };
  79. /** PXE boot server multicast address */
  80. #define DHCP_PXE_BOOT_SERVER_MCAST DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 7 )
  81. /** PXE boot servers */
  82. #define DHCP_PXE_BOOT_SERVERS DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 8 )
  83. /** PXE boot server */
  84. struct dhcp_pxe_boot_server {
  85. /** "Type" */
  86. uint16_t type;
  87. /** Number of IPv4 addresses */
  88. uint8_t num_ip;
  89. /** IPv4 addresses */
  90. struct in_addr ip[0];
  91. } __attribute__ (( packed ));
  92. /** PXE boot menu */
  93. #define DHCP_PXE_BOOT_MENU DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 9 )
  94. /** PXE boot menu */
  95. struct dhcp_pxe_boot_menu {
  96. /** "Type" */
  97. uint16_t type;
  98. /** Description length */
  99. uint8_t desc_len;
  100. /** Description */
  101. char desc[0];
  102. } __attribute__ (( packed ));
  103. /** PXE boot menu prompt */
  104. #define DHCP_PXE_BOOT_MENU_PROMPT DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 10 )
  105. /** PXE boot menu prompt */
  106. struct dhcp_pxe_boot_menu_prompt {
  107. /** Timeout
  108. *
  109. * A value of 0 means "time out immediately and select first
  110. * boot item, without displaying the prompt". A value of 255
  111. * means "display menu immediately with no timeout". Any
  112. * other value means "display prompt, wait this many seconds
  113. * for keypress, if key is F8, display menu, otherwise select
  114. * first boot item".
  115. */
  116. uint8_t timeout;
  117. /** Prompt to press F8 */
  118. char prompt[0];
  119. } __attribute__ (( packed ));
  120. /** PXE boot menu item */
  121. #define DHCP_PXE_BOOT_MENU_ITEM DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 71 )
  122. /** PXE boot menu item */
  123. struct dhcp_pxe_boot_menu_item {
  124. /** "Type"
  125. *
  126. * This field actually identifies the specific boot server (or
  127. * cluster of boot servers offering identical boot files).
  128. */
  129. uint16_t type;
  130. /** "Layer"
  131. *
  132. * Just don't ask.
  133. */
  134. uint16_t layer;
  135. } __attribute__ (( packed ));
  136. /** Requested IP address */
  137. #define DHCP_REQUESTED_ADDRESS 50
  138. /** Lease time */
  139. #define DHCP_LEASE_TIME 51
  140. /** Option overloading
  141. *
  142. * The value of this option is the bitwise-OR of zero or more
  143. * DHCP_OPTION_OVERLOAD_XXX constants.
  144. */
  145. #define DHCP_OPTION_OVERLOAD 52
  146. /** The "file" field is overloaded to contain extra DHCP options */
  147. #define DHCP_OPTION_OVERLOAD_FILE 1
  148. /** The "sname" field is overloaded to contain extra DHCP options */
  149. #define DHCP_OPTION_OVERLOAD_SNAME 2
  150. /** DHCP message type */
  151. #define DHCP_MESSAGE_TYPE 53
  152. #define DHCPNONE 0
  153. #define DHCPDISCOVER 1
  154. #define DHCPOFFER 2
  155. #define DHCPREQUEST 3
  156. #define DHCPDECLINE 4
  157. #define DHCPACK 5
  158. #define DHCPNAK 6
  159. #define DHCPRELEASE 7
  160. #define DHCPINFORM 8
  161. /** DHCP server identifier */
  162. #define DHCP_SERVER_IDENTIFIER 54
  163. /** Parameter request list */
  164. #define DHCP_PARAMETER_REQUEST_LIST 55
  165. /** Maximum DHCP message size */
  166. #define DHCP_MAX_MESSAGE_SIZE 57
  167. /** Vendor class identifier */
  168. #define DHCP_VENDOR_CLASS_ID 60
  169. /** Client identifier */
  170. #define DHCP_CLIENT_ID 61
  171. /** Client identifier */
  172. struct dhcp_client_id {
  173. /** Link-layer protocol */
  174. uint8_t ll_proto;
  175. /** Link-layer address */
  176. uint8_t ll_addr[MAX_LL_ADDR_LEN];
  177. } __attribute__ (( packed ));
  178. /** TFTP server name
  179. *
  180. * This option replaces the fixed "sname" field, when that field is
  181. * used to contain overloaded options.
  182. */
  183. #define DHCP_TFTP_SERVER_NAME 66
  184. /** Bootfile name
  185. *
  186. * This option replaces the fixed "file" field, when that field is
  187. * used to contain overloaded options.
  188. */
  189. #define DHCP_BOOTFILE_NAME 67
  190. /** User class identifier */
  191. #define DHCP_USER_CLASS_ID 77
  192. /** Client system architecture */
  193. #define DHCP_CLIENT_ARCHITECTURE 93
  194. /** Client network device interface */
  195. #define DHCP_CLIENT_NDI 94
  196. /** UUID client identifier */
  197. #define DHCP_CLIENT_UUID 97
  198. /** UUID client identifier */
  199. struct dhcp_client_uuid {
  200. /** Identifier type */
  201. uint8_t type;
  202. /** UUID */
  203. union uuid uuid;
  204. } __attribute__ (( packed ));
  205. #define DHCP_CLIENT_UUID_TYPE 0
  206. /** Etherboot-specific encapsulated options
  207. *
  208. * This encapsulated options field is used to contain all options
  209. * specific to Etherboot (i.e. not assigned by IANA or other standards
  210. * bodies).
  211. */
  212. #define DHCP_EB_ENCAP 175
  213. /** Priority of this options block
  214. *
  215. * This is a signed 8-bit integer field indicating the priority of
  216. * this block of options. It can be used to specify the relative
  217. * priority of multiple option blocks (e.g. options from non-volatile
  218. * storage versus options from a DHCP server).
  219. */
  220. #define DHCP_EB_PRIORITY DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x01 )
  221. /** "Your" IP address
  222. *
  223. * This option is used internally to contain the value of the "yiaddr"
  224. * field, in order to provide a consistent approach to storing and
  225. * processing options. It should never be present in a DHCP packet.
  226. */
  227. #define DHCP_EB_YIADDR DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x02 )
  228. /** "Server" IP address
  229. *
  230. * This option is used internally to contain the value of the "siaddr"
  231. * field, in order to provide a consistent approach to storing and
  232. * processing options. It should never be present in a DHCP packet.
  233. */
  234. #define DHCP_EB_SIADDR DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x03 )
  235. /** Keep SAN drive registered
  236. *
  237. * If set to a non-zero value, gPXE will not detach any SAN drive
  238. * after failing to boot from it. (This option is required in order
  239. * to perform a Windows Server 2008 installation direct to an iSCSI
  240. * target.)
  241. */
  242. #define DHCP_EB_KEEP_SAN DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x08 )
  243. /*
  244. * Tags in the range 0x10-0x7f are reserved for feature markers
  245. *
  246. */
  247. /** Skip PXE DHCP protocol extensions such as ProxyDHCP
  248. *
  249. * If set to a non-zero value, gPXE will not wait for ProxyDHCP offers
  250. * and will ignore any PXE-specific DHCP options that it receives.
  251. */
  252. #define DHCP_EB_NO_PXEDHCP DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb0 )
  253. /** Network device descriptor
  254. *
  255. * Byte 0 is the bus type ID; remaining bytes depend on the bus type.
  256. *
  257. * PCI devices:
  258. * Byte 0 : 1 (PCI)
  259. * Byte 1 : PCI vendor ID MSB
  260. * Byte 2 : PCI vendor ID LSB
  261. * Byte 3 : PCI device ID MSB
  262. * Byte 4 : PCI device ID LSB
  263. */
  264. #define DHCP_EB_BUS_ID DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb1 )
  265. /** Network device descriptor */
  266. struct dhcp_netdev_desc {
  267. /** Bus type ID */
  268. uint8_t type;
  269. /** Vendor ID */
  270. uint16_t vendor;
  271. /** Device ID */
  272. uint16_t device;
  273. } __attribute__ (( packed ));
  274. /** BIOS drive number
  275. *
  276. * This is the drive number for a drive emulated via INT 13. 0x80 is
  277. * the first hard disk, 0x81 is the second hard disk, etc.
  278. */
  279. #define DHCP_EB_BIOS_DRIVE DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbd )
  280. /** Username
  281. *
  282. * This will be used as the username for any required authentication.
  283. * It is expected that this option's value will be held in
  284. * non-volatile storage, rather than transmitted as part of a DHCP
  285. * packet.
  286. */
  287. #define DHCP_EB_USERNAME DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbe )
  288. /** Password
  289. *
  290. * This will be used as the password for any required authentication.
  291. * It is expected that this option's value will be held in
  292. * non-volatile storage, rather than transmitted as part of a DHCP
  293. * packet.
  294. */
  295. #define DHCP_EB_PASSWORD DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbf )
  296. /** Reverse username
  297. *
  298. * This will be used as the reverse username (i.e. the username
  299. * provided by the server) for any required authentication. It is
  300. * expected that this option's value will be held in non-volatile
  301. * storage, rather than transmitted as part of a DHCP packet.
  302. */
  303. #define DHCP_EB_REVERSE_USERNAME DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xc0 )
  304. /** Reverse password
  305. *
  306. * This will be used as the reverse password (i.e. the password
  307. * provided by the server) for any required authentication. It is
  308. * expected that this option's value will be held in non-volatile
  309. * storage, rather than transmitted as part of a DHCP packet.
  310. */
  311. #define DHCP_EB_REVERSE_PASSWORD DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xc1 )
  312. /** gPXE version number */
  313. #define DHCP_EB_VERSION DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xeb )
  314. /** iSCSI primary target IQN */
  315. #define DHCP_ISCSI_PRIMARY_TARGET_IQN 201
  316. /** iSCSI secondary target IQN */
  317. #define DHCP_ISCSI_SECONDARY_TARGET_IQN 202
  318. /** iSCSI initiator IQN */
  319. #define DHCP_ISCSI_INITIATOR_IQN 203
  320. /** Maximum normal DHCP option */
  321. #define DHCP_MAX_OPTION 254
  322. /** End of options
  323. *
  324. * This tag does not have a length field; it is always only a single
  325. * byte in length.
  326. */
  327. #define DHCP_END 255
  328. /** @} */
  329. /**
  330. * Count number of arguments to a variadic macro
  331. *
  332. * This rather neat, non-iterative solution is courtesy of Laurent
  333. * Deniau.
  334. *
  335. */
  336. #define _VA_ARG_COUNT( _1, _2, _3, _4, _5, _6, _7, _8, \
  337. _9, _10, _11, _12, _13, _14, _15, _16, \
  338. _17, _18, _19, _20, _21, _22, _23, _24, \
  339. _25, _26, _27, _28, _29, _30, _31, _32, \
  340. _33, _34, _35, _36, _37, _38, _39, _40, \
  341. _41, _42, _43, _44, _45, _46, _47, _48, \
  342. _49, _50, _51, _52, _53, _54, _55, _56, \
  343. _57, _58, _59, _60, _61, _62, _63, N, ... ) N
  344. #define VA_ARG_COUNT( ... ) \
  345. _VA_ARG_COUNT ( __VA_ARGS__, \
  346. 63, 62, 61, 60, 59, 58, 57, 56, \
  347. 55, 54, 53, 52, 51, 50, 49, 48, \
  348. 47, 46, 45, 44, 43, 42, 41, 40, \
  349. 39, 38, 37, 36, 35, 34, 33, 32, \
  350. 31, 30, 29, 28, 27, 26, 25, 24, \
  351. 23, 22, 21, 20, 19, 18, 17, 16, \
  352. 15, 14, 13, 12, 11, 10, 9, 8, \
  353. 7, 6, 5, 4, 3, 2, 1, 0 )
  354. /** Construct a DHCP option from a list of bytes */
  355. #define DHCP_OPTION( ... ) VA_ARG_COUNT ( __VA_ARGS__ ), __VA_ARGS__
  356. /** Construct a DHCP option from a list of characters */
  357. #define DHCP_STRING( ... ) DHCP_OPTION ( __VA_ARGS__ )
  358. /** Construct a byte-valued DHCP option */
  359. #define DHCP_BYTE( value ) DHCP_OPTION ( value )
  360. /** Construct a word-valued DHCP option */
  361. #define DHCP_WORD( value ) DHCP_OPTION ( ( ( (value) >> 8 ) & 0xff ), \
  362. ( ( (value) >> 0 ) & 0xff ) )
  363. /** Construct a dword-valued DHCP option */
  364. #define DHCP_DWORD( value ) DHCP_OPTION ( ( ( (value) >> 24 ) & 0xff ), \
  365. ( ( (value) >> 16 ) & 0xff ), \
  366. ( ( (value) >> 8 ) & 0xff ), \
  367. ( ( (value) >> 0 ) & 0xff ) )
  368. /** Construct a DHCP encapsulated options field */
  369. #define DHCP_ENCAP( ... ) DHCP_OPTION ( __VA_ARGS__, DHCP_END )
  370. /**
  371. * A DHCP option
  372. *
  373. * DHCP options consist of a mandatory tag, a length field that is
  374. * mandatory for all options except @c DHCP_PAD and @c DHCP_END, and a
  375. * payload.
  376. */
  377. struct dhcp_option {
  378. /** Tag
  379. *
  380. * Must be a @c DHCP_XXX value.
  381. */
  382. uint8_t tag;
  383. /** Length
  384. *
  385. * This is the length of the data field (i.e. excluding the
  386. * tag and length fields). For the two tags @c DHCP_PAD and
  387. * @c DHCP_END, the length field is implicitly zero and is
  388. * also missing, i.e. these DHCP options are only a single
  389. * byte in length.
  390. */
  391. uint8_t len;
  392. /** Option data */
  393. uint8_t data[0];
  394. } __attribute__ (( packed ));
  395. /**
  396. * Length of a DHCP option header
  397. *
  398. * The header is the portion excluding the data, i.e. the tag and the
  399. * length.
  400. */
  401. #define DHCP_OPTION_HEADER_LEN ( offsetof ( struct dhcp_option, data ) )
  402. /** Maximum length for a single DHCP option */
  403. #define DHCP_MAX_LEN 0xff
  404. /**
  405. * A DHCP header
  406. *
  407. */
  408. struct dhcphdr {
  409. /** Operation
  410. *
  411. * This must be either @c BOOTP_REQUEST or @c BOOTP_REPLY.
  412. */
  413. uint8_t op;
  414. /** Hardware address type
  415. *
  416. * This is an ARPHRD_XXX constant. Note that ARPHRD_XXX
  417. * constants are nominally 16 bits wide; this could be
  418. * considered to be a bug in the BOOTP/DHCP specification.
  419. */
  420. uint8_t htype;
  421. /** Hardware address length */
  422. uint8_t hlen;
  423. /** Number of hops from server */
  424. uint8_t hops;
  425. /** Transaction ID */
  426. uint32_t xid;
  427. /** Seconds since start of acquisition */
  428. uint16_t secs;
  429. /** Flags */
  430. uint16_t flags;
  431. /** "Client" IP address
  432. *
  433. * This is filled in if the client already has an IP address
  434. * assigned and can respond to ARP requests.
  435. */
  436. struct in_addr ciaddr;
  437. /** "Your" IP address
  438. *
  439. * This is the IP address assigned by the server to the client.
  440. */
  441. struct in_addr yiaddr;
  442. /** "Server" IP address
  443. *
  444. * This is the IP address of the next server to be used in the
  445. * boot process.
  446. */
  447. struct in_addr siaddr;
  448. /** "Gateway" IP address
  449. *
  450. * This is the IP address of the DHCP relay agent, if any.
  451. */
  452. struct in_addr giaddr;
  453. /** Client hardware address */
  454. uint8_t chaddr[16];
  455. /** Server host name (null terminated)
  456. *
  457. * This field may be overridden and contain DHCP options
  458. */
  459. char sname[64];
  460. /** Boot file name (null terminated)
  461. *
  462. * This field may be overridden and contain DHCP options
  463. */
  464. char file[128];
  465. /** DHCP magic cookie
  466. *
  467. * Must have the value @c DHCP_MAGIC_COOKIE.
  468. */
  469. uint32_t magic;
  470. /** DHCP options
  471. *
  472. * Variable length; extends to the end of the packet. Minimum
  473. * length (for the sake of sanity) is 1, to allow for a single
  474. * @c DHCP_END tag.
  475. */
  476. uint8_t options[0];
  477. };
  478. /** Opcode for a request from client to server */
  479. #define BOOTP_REQUEST 1
  480. /** Opcode for a reply from server to client */
  481. #define BOOTP_REPLY 2
  482. /** BOOTP reply must be broadcast
  483. *
  484. * Clients that cannot accept unicast BOOTP replies must set this
  485. * flag.
  486. */
  487. #define BOOTP_FL_BROADCAST 0x8000
  488. /** DHCP magic cookie */
  489. #define DHCP_MAGIC_COOKIE 0x63825363UL
  490. /** DHCP minimum packet length
  491. *
  492. * This is the mandated minimum packet length that a DHCP participant
  493. * must be prepared to receive.
  494. */
  495. #define DHCP_MIN_LEN 552
  496. /** Timeouts for sending DHCP packets */
  497. #define DHCP_MIN_TIMEOUT ( 1 * TICKS_PER_SEC )
  498. #define DHCP_MAX_TIMEOUT ( 10 * TICKS_PER_SEC )
  499. /** Maximum time that we will wait for ProxyDHCP responses */
  500. #define PROXYDHCP_MAX_TIMEOUT ( 2 * TICKS_PER_SEC )
  501. /** Maximum time that we will wait for Boot Server responses */
  502. #define PXEBS_MAX_TIMEOUT ( 3 * TICKS_PER_SEC )
  503. /** Settings block name used for DHCP responses */
  504. #define DHCP_SETTINGS_NAME "dhcp"
  505. /** Settings block name used for ProxyDHCP responses */
  506. #define PROXYDHCP_SETTINGS_NAME "proxydhcp"
  507. /** Setting block name used for BootServerDHCP responses */
  508. #define PXEBS_SETTINGS_NAME "pxebs"
  509. extern int dhcp_create_packet ( struct dhcp_packet *dhcppkt,
  510. struct net_device *netdev, uint8_t msgtype,
  511. const void *options, size_t options_len,
  512. void *data, size_t max_len );
  513. extern int dhcp_create_request ( struct dhcp_packet *dhcppkt,
  514. struct net_device *netdev,
  515. unsigned int msgtype, struct in_addr ciaddr,
  516. void *data, size_t max_len );
  517. extern int start_dhcp ( struct job_interface *job, struct net_device *netdev );
  518. extern int start_pxebs ( struct job_interface *job, struct net_device *netdev,
  519. unsigned int pxe_type );
  520. #endif /* _GPXE_DHCP_H */