240 lines
7.4 KiB
C
240 lines
7.4 KiB
C
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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 "lwip/opt.h"
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#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/netif.h"
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#include "lwip/udp.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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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_coarse_tmr() */
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#define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)
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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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#define DHCP_CHADDR_LEN 16U
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#define DHCP_SNAME_LEN 64U
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#define DHCP_FILE_LEN 128U
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struct dhcp
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{
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/** transaction identifier of last sent request */
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u32_t xid;
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/** our connection to the DHCP server */
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struct udp_pcb *pcb;
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/** incoming msg */
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struct dhcp_msg *msg_in;
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/** current DHCP state machine state */
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u8_t state;
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/** retries of current request */
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u8_t tries;
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#if LWIP_DHCP_AUTOIP_COOP
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u8_t autoip_coop_state;
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#endif
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u8_t subnet_mask_given;
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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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ip_addr_t server_ip_addr; /* dhcp server address that offered this lease */
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ip_addr_t offered_ip_addr;
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ip_addr_t offered_sn_mask;
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ip_addr_t offered_gw_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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/* @todo: LWIP_DHCP_BOOTP_FILE configuration option?
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integrate with possible TFTP-client for booting? */
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#if LWIP_DHCP_BOOTP_FILE
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ip_addr_t offered_si_addr;
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char boot_file_name[DHCP_FILE_LEN];
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#endif /* LWIP_DHCP_BOOTPFILE */
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};
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/* MUST be compiled with "pack structs" or equivalent! */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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/** minimum set of fields of any DHCP message */
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struct dhcp_msg
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{
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PACK_STRUCT_FIELD(u8_t op);
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PACK_STRUCT_FIELD(u8_t htype);
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PACK_STRUCT_FIELD(u8_t hlen);
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PACK_STRUCT_FIELD(u8_t hops);
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PACK_STRUCT_FIELD(u32_t xid);
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PACK_STRUCT_FIELD(u16_t secs);
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PACK_STRUCT_FIELD(u16_t flags);
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PACK_STRUCT_FIELD(ip_addr_p_t ciaddr);
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PACK_STRUCT_FIELD(ip_addr_p_t yiaddr);
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PACK_STRUCT_FIELD(ip_addr_p_t siaddr);
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PACK_STRUCT_FIELD(ip_addr_p_t giaddr);
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PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);
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PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);
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PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);
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PACK_STRUCT_FIELD(u32_t cookie);
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#define DHCP_MIN_OPTIONS_LEN 68U
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/** make sure user does not configure this too small */
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#if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
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# undef DHCP_OPTIONS_LEN
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#endif
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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))
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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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PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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void dhcp_set_struct(struct netif *netif, struct dhcp *dhcp);
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/** start DHCP configuration */
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err_t dhcp_start(struct netif *netif);
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/** enforce early lease renewal (not needed normally)*/
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err_t dhcp_renew(struct netif *netif);
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/** release the DHCP lease, usually called before dhcp_stop()*/
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err_t dhcp_release(struct netif *netif);
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/** stop DHCP configuration */
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void dhcp_stop(struct netif *netif);
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/** inform server of our manual IP address */
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void dhcp_inform(struct netif *netif);
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/** Handle a possible change in the network configuration */
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void dhcp_network_changed(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 netif *netif, ip_addr_t *addr);
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#endif
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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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/** DHCP message item offsets and length */
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#define DHCP_OP_OFS 0
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#define DHCP_HTYPE_OFS 1
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#define DHCP_HLEN_OFS 2
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#define DHCP_HOPS_OFS 3
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#define DHCP_XID_OFS 4
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#define DHCP_SECS_OFS 8
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#define DHCP_FLAGS_OFS 10
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#define DHCP_CIADDR_OFS 12
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#define DHCP_YIADDR_OFS 16
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#define DHCP_SIADDR_OFS 20
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#define DHCP_GIADDR_OFS 24
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#define DHCP_CHADDR_OFS 28
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#define DHCP_SNAME_OFS 44
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#define DHCP_FILE_OFS 108
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#define DHCP_MSG_LEN 236
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#define DHCP_COOKIE_OFS DHCP_MSG_LEN
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#define DHCP_OPTIONS_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_OFF 0
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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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/** not yet implemented #define DHCP_RELEASING 11 */
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#define DHCP_BACKING_OFF 12
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/** AUTOIP cooperatation flags */
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#define DHCP_AUTOIP_COOP_STATE_OFF 0
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#define DHCP_AUTOIP_COOP_STATE_ON 1
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#define DHCP_BOOTREQUEST 1
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#define DHCP_BOOTREPLY 2
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/** DHCP message types */
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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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/** DHCP hardware type, currently only ethernet is supported */
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#define DHCP_HTYPE_ETH 1
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#define DHCP_MAGIC_COOKIE 0x63825363UL
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/* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */
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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_DNS_SERVER 6
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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 2132 9.7, server IP address */
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#define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
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#define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 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_US 60
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_DHCP */
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#endif /*__LWIP_DHCP_H__*/
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