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Added DHCP client by Leon Woestenberg
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src/core/dhcp.c
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1317
src/core/dhcp.c
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src/include/lwip/dhcp.h
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src/include/lwip/dhcp.h
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/** @file
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*/
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#ifndef __LWIP_DHCP_H__
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#define __LWIP_DHCP_H__
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#include "udp.h"
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#include "lwip/netif.h"
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#include "lwipopts.h"
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// period (in seconds) of the application calling dhcp_coarse_tmr()
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#define DHCP_COARSE_TIMER_SECS 60
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// period (in milliseconds) of the application calling dhcp_fine_tmr()
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#define DHCP_FINE_TIMER_MSECS 500
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struct dhcp_state
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{
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struct dhcp_state *next; // for linked list purposes
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u8_t state; // current DHCP state (of DHCP state machine)
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u8_t tries; // retries of current request
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u32_t xid; // id of last sent request
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struct netif *netif; // interface to be configured
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struct udp_pcb *pcb; // our connection
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struct pbuf *p; // (first) pbuf of incoming msg
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struct dhcp_msg *msg_in; // incoming msg
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struct dhcp_msg *options_in; // incoming msg options
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u16_t options_in_len; // ingoing msg options length
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struct pbuf *p_out; // pbuf of outcoming msg
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struct dhcp_msg *msg_out; // outgoing msg
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u16_t options_out_len; // outgoing msg options length
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u16_t request_timeout; // #ticks with period DHCP_FINE_TIMER_SECS for request timeout
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u16_t t1_timeout; // #ticks with period DHCP_COARSE_TIMER_SECS for renewal time
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u16_t t2_timeout; // #ticks with period DHCP_COARSE_TIMER_SECS for rebind time
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struct ip_addr server_ip_addr; // dhcp server address that offered this lease
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struct ip_addr offered_ip_addr;
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struct ip_addr offered_sn_mask;
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struct ip_addr offered_gw_addr;
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struct ip_addr offered_bc_addr;
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u32_t offered_t0_lease; // lease period (in seconds)
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u32_t offered_t1_renew; // recommended renew time (usually 50% of lease period)
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u32_t offered_t2_rebind; // recommended rebind time (usually 66% of lease period)
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};
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// always present fields of any DHCP message
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struct dhcp_msg
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{
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u8_t op;
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u8_t htype;
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u8_t hlen;
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u8_t hops;
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u32_t xid;
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u16_t secs;
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u16_t flags;
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u32_t ciaddr;
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u32_t yiaddr;
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u32_t siaddr;
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u32_t giaddr;
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#define DHCP_CHADDR_LEN 16U
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u8_t chaddr[DHCP_CHADDR_LEN];
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#define DHCP_SNAME_LEN 64U
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u8_t sname[DHCP_SNAME_LEN];
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#define DHCP_FILE_LEN 128U
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u8_t file[DHCP_FILE_LEN];
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u32_t cookie;
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#define DHCP_MIN_OPTIONS_LEN 68U
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// allow this to be configured in lwipopts.h, but not too small
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#if ((!defined(DHCP_OPTIONS_LEN)) || (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
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// set this to be sufficient for your options in outgoing DHCP msgs
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# define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
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#endif
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u8_t options[DHCP_OPTIONS_LEN];
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};
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// initialize DHCP client
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void dhcp_init(void);
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// start DHCP configuration
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struct dhcp_state *dhcp_start(struct netif *netif);
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// stop DHCP configuration
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void dhcp_stop(struct dhcp_state *state);
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// enforce lease renewal
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err_t dhcp_renew(struct dhcp_state *state);
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// inform server of our IP address
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void dhcp_inform(struct netif *netif);
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// if enabled, check whether the offered IP address is not in use, using ARP
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#if DHCP_DOES_ARP_CHECK
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void dhcp_arp_reply(struct ip_addr *addr);
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#endif
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// to be called regularly
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#if (DHCP_TIMER_CALLBACKS == 0)
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// to be called every minute
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void dhcp_coarse_tmr(void);
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// to be called every half second
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void dhcp_fine_tmr(void);
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#endif
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// DHCP message item offsets and length
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#define DHCP_MSG_OFS (UDP_DATA_OFS)
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#define DHCP_OP_OFS (DHCP_MSG_OFS + 0)
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#define DHCP_HTYPE_OFS (DHCP_MSG_OFS + 1)
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#define DHCP_HLEN_OFS (DHCP_MSG_OFS + 2)
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#define DHCP_HOPS_OFS (DHCP_MSG_OFS + 3)
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#define DHCP_XID_OFS (DHCP_MSG_OFS + 4)
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#define DHCP_SECS_OFS (DHCP_MSG_OFS + 8)
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#define DHCP_FLAGS_OFS (DHCP_MSG_OFS + 10)
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#define DHCP_CIADDR_OFS (DHCP_MSG_OFS + 12)
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#define DHCP_YIADDR_OFS (DHCP_MSG_OFS + 16)
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#define DHCP_SIADDR_OFS (DHCP_MSG_OFS + 20)
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#define DHCP_GIADDR_OFS (DHCP_MSG_OFS + 24)
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#define DHCP_CHADDR_OFS (DHCP_MSG_OFS + 28)
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#define DHCP_SNAME_OFS (DHCP_MSG_OFS + 44)
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#define DHCP_FILE_OFS (DHCP_MSG_OFS + 108)
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#define DHCP_MSG_LEN 236
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#define DHCP_COOKIE_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN)
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#define DHCP_OPTIONS_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN + 4)
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#define DHCP_CLIENT_PORT 68
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#define DHCP_SERVER_PORT 67
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// DHCP client states
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#define DHCP_REQUESTING 1
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#define DHCP_INIT 2
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#define DHCP_REBOOTING 3
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#define DHCP_REBINDING 4
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#define DHCP_RENEWING 5
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#define DHCP_SELECTING 6
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#define DHCP_INFORMING 7
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#define DHCP_CHECKING 8
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#define DHCP_PERMANENT 9
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#define DHCP_BOUND 10
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#define DHCP_BACKING_OFF 11
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#define DHCP_OFF 12
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#define DHCP_BOOTREQUEST 1
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#define DHCP_BOOTREPLY 2
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#define DHCP_DISCOVER 1
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#define DHCP_OFFER 2
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#define DHCP_REQUEST 3
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#define DHCP_DECLINE 4
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#define DHCP_ACK 5
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#define DHCP_NAK 6
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#define DHCP_RELEASE 7
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#define DHCP_INFORM 8
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#define DHCP_HTYPE_ETH 1
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#define DHCP_HLEN_ETH 6
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#define DHCP_BROADCAST_FLAG 15
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#define DHCP_BROADCAST_MASK (1 << DHCP_FLAG_BROADCAST)
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// BootP options
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#define DHCP_OPTION_PAD 0
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#define DHCP_OPTION_SUBNET_MASK 1 // RFC 2132 3.3
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#define DHCP_OPTION_ROUTER 3
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#define DHCP_OPTION_HOSTNAME 12
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#define DHCP_OPTION_IP_TTL 23
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#define DHCP_OPTION_MTU 26
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#define DHCP_OPTION_BROADCAST 28
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#define DHCP_OPTION_TCP_TTL 37
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#define DHCP_OPTION_END 255
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// DHCP options
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#define DHCP_OPTION_REQUESTED_IP 50 // RFC 2132 9.1, requested IP address
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#define DHCP_OPTION_LEASE_TIME 51 // RFC 2132 9.2, time in seconds, in 4 bytes
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#define DHCP_OPTION_OVERLOAD 52 // RFC2132 9.3, use file and/or sname field for options
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#define DHCP_OPTION_MESSAGE_TYPE 53 // RFC 2132 9.6, important for DHCP
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#define DHCP_OPTION_MESSAGE_TYPE_LEN 1
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#define DHCP_OPTION_SERVER_ID 54 // RFC 2131 9.7, server IP address
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#define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 // RFC 2131 9.8, requested option types
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#define DHCP_OPTION_MAX_MSG_SIZE 57 // RFC 2131 9.10, message size accepted >= 576
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#define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
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#define DHCP_OPTION_T1 58 // T1 renewal time
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#define DHCP_OPTION_T2 59 // T2 rebinding time
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#define DHCP_OPTION_CLIENT_ID 61
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#define DHCP_OPTION_TFTP_SERVERNAME 66
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#define DHCP_OPTION_BOOTFILE 67
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// possible combinations of overloading the file and sname fields with options
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#define DHCP_OVERLOAD_NONE 0
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#define DHCP_OVERLOAD_FILE 1
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#define DHCP_OVERLOAD_SNAME 2
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#define DHCP_OVERLOAD_SNAME_FILE 3
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#endif //__LWIP_DHCP_H__
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