1 /* net/gen/dhcp.h - DHCP packet format Author: Kees J. Bot 2 * 1 Dec 2000 3 */ 4 5 #ifndef __NET__GEN__DHCP_H__ 6 #define __NET__GEN__DHCP_H__ 7 8 typedef struct dhcp { 9 u8_t op; /* Message opcode/type. */ 10 u8_t htype; /* Hardware address type. */ 11 u8_t hlen; /* Hardware address length. */ 12 u8_t hops; /* Hop count when relaying. */ 13 u32_t xid; /* Transaction ID. */ 14 u16_t secs; /* Seconds past since client began. */ 15 u16_t flags; /* Flags. */ 16 ipaddr_t ciaddr; /* Client IP address. */ 17 ipaddr_t yiaddr; /* "Your" IP address. */ 18 ipaddr_t siaddr; /* Boot server IP address. */ 19 ipaddr_t giaddr; /* Relay agent (gateway) IP address. */ 20 u8_t chaddr[16]; /* Client hardware address. */ 21 u8_t sname[64]; /* Server host name. */ 22 u8_t file[128]; /* Boot file. */ 23 u32_t magic; /* Magic number. */ 24 u8_t options[308]; /* Optional parameters. */ 25 } dhcp_t; 26 27 /* DHCP operations and stuff: */ 28 #define DHCP_BOOTREQUEST 1 /* Boot request message. */ 29 #define DHCP_BOOTREPLY 2 /* Boot reply message. */ 30 #define DHCP_HTYPE_ETH 1 /* Ethernet hardware type. */ 31 #define DHCP_HLEN_ETH 6 /* Ethernet hardware address length. */ 32 #define DHCP_FLAGS_BCAST 0x8000U /* Reply must be broadcast to client. */ 33 34 /* "Magic" first four option bytes. */ 35 #define DHCP_MAGIC htonl(0x63825363UL) 36 37 /* DHCP common tags: */ 38 #define DHCP_TAG_NETMASK 1 /* Netmask. */ 39 #define DHCP_TAG_GATEWAY 3 /* Gateway list. */ 40 #define DHCP_TAG_DNS 6 /* DNS Nameserver list. */ 41 #define DHCP_TAG_HOSTNAME 12 /* Host name. */ 42 #define DHCP_TAG_DOMAIN 15 /* Domain. */ 43 #define DHCP_TAG_IPMTU 26 /* Interface MTU. */ 44 45 /* DHCP protocol tags: */ 46 #define DHCP_TAG_REQIP 50 /* Request this IP. */ 47 #define DHCP_TAG_LEASE 51 /* Lease time requested/offered. */ 48 #define DHCP_TAG_OVERLOAD 52 /* Options continued in file/sname. */ 49 #define DHCP_TAG_TYPE 53 /* DHCP message (values below). */ 50 #define DHCP_TAG_SERVERID 54 /* Server identifier. */ 51 #define DHCP_TAG_REQPAR 55 /* Parameters requested. */ 52 #define DHCP_TAG_MESSAGE 56 /* Error message. */ 53 #define DHCP_TAG_MAXDHCP 57 /* Max DHCP packet size. */ 54 #define DHCP_TAG_RENEWAL 58 /* Time to go into renewal state. */ 55 #define DHCP_TAG_REBINDING 59 /* Time to go into rebinding state. */ 56 #define DHCP_TAG_CLASSID 60 /* Class identifier. */ 57 #define DHCP_TAG_CLIENTID 61 /* Client identifier. */ 58 59 /* DHCP messages: */ 60 #define DHCP_DISCOVER 1 /* Locate available servers. */ 61 #define DHCP_OFFER 2 /* Parameters offered to client. */ 62 #define DHCP_REQUEST 3 /* (Re)request offered parameters. */ 63 #define DHCP_DECLINE 4 /* Client declines offer. */ 64 #define DHCP_ACK 5 /* Server acknowlegdes request. */ 65 #define DHCP_NAK 6 /* Server denies request. */ 66 #define DHCP_RELEASE 7 /* Client relinguishes address. */ 67 #define DHCP_INFORM 8 /* Client requests just local config. */ 68 69 void dhcp_init(dhcp_t *_dp); 70 int dhcp_settag(dhcp_t *_dp, int _tag, void *_data, size_t _len); 71 int dhcp_gettag(dhcp_t *_dp, int _searchtag, u8_t **_pdata, size_t *_plen); 72 73 #endif /* __NET__GEN__DHCP_H__ */ 74