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