[164] | 1 | /** @file
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| 2 | */
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| 3 |
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| 4 | #ifndef __LWIP_DHCP_H__
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| 5 | #define __LWIP_DHCP_H__
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| 6 |
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| 7 | #include "lwip/opt.h"
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| 8 |
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| 9 | #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
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| 10 |
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| 11 | #include "lwip/netif.h"
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| 12 | #include "lwip/udp.h"
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| 13 |
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| 14 | #ifdef __cplusplus
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| 15 | extern "C" {
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| 16 | #endif
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| 17 |
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| 18 | /** period (in seconds) of the application calling dhcp_coarse_tmr() */
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| 19 | #define DHCP_COARSE_TIMER_SECS 60
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| 20 | /** period (in milliseconds) of the application calling dhcp_coarse_tmr() */
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| 21 | #define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)
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| 22 | /** period (in milliseconds) of the application calling dhcp_fine_tmr() */
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| 23 | #define DHCP_FINE_TIMER_MSECS 500
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| 24 |
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| 25 | #define DHCP_CHADDR_LEN 16U
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| 26 | #define DHCP_SNAME_LEN 64U
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| 27 | #define DHCP_FILE_LEN 128U
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| 28 |
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| 29 | struct dhcp
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| 30 | {
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| 31 | /** transaction identifier of last sent request */
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| 32 | u32_t xid;
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| 33 | /** our connection to the DHCP server */
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| 34 | struct udp_pcb *pcb;
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| 35 | /** incoming msg */
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| 36 | struct dhcp_msg *msg_in;
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| 37 | /** current DHCP state machine state */
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| 38 | u8_t state;
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| 39 | /** retries of current request */
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| 40 | u8_t tries;
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| 41 | #if LWIP_DHCP_AUTOIP_COOP
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| 42 | u8_t autoip_coop_state;
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| 43 | #endif
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| 44 | u8_t subnet_mask_given;
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| 45 |
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| 46 | struct pbuf *p_out; /* pbuf of outcoming msg */
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| 47 | struct dhcp_msg *msg_out; /* outgoing msg */
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| 48 | u16_t options_out_len; /* outgoing msg options length */
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| 49 | u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */
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| 50 | u16_t t1_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */
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| 51 | u16_t t2_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */
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| 52 | ip_addr_t server_ip_addr; /* dhcp server address that offered this lease */
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| 53 | ip_addr_t offered_ip_addr;
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| 54 | ip_addr_t offered_sn_mask;
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| 55 | ip_addr_t offered_gw_addr;
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| 56 |
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| 57 | u32_t offered_t0_lease; /* lease period (in seconds) */
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| 58 | u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
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| 59 | u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period) */
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| 60 | /* @todo: LWIP_DHCP_BOOTP_FILE configuration option?
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| 61 | integrate with possible TFTP-client for booting? */
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| 62 | #if LWIP_DHCP_BOOTP_FILE
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| 63 | ip_addr_t offered_si_addr;
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| 64 | char boot_file_name[DHCP_FILE_LEN];
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| 65 | #endif /* LWIP_DHCP_BOOTPFILE */
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| 66 | };
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| 67 |
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| 68 | /* MUST be compiled with "pack structs" or equivalent! */
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| 69 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 70 | # include "arch/bpstruct.h"
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| 71 | #endif
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| 72 | PACK_STRUCT_BEGIN
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| 73 | /** minimum set of fields of any DHCP message */
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| 74 | struct dhcp_msg
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| 75 | {
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| 76 | PACK_STRUCT_FIELD(u8_t op);
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| 77 | PACK_STRUCT_FIELD(u8_t htype);
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| 78 | PACK_STRUCT_FIELD(u8_t hlen);
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| 79 | PACK_STRUCT_FIELD(u8_t hops);
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| 80 | PACK_STRUCT_FIELD(u32_t xid);
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| 81 | PACK_STRUCT_FIELD(u16_t secs);
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| 82 | PACK_STRUCT_FIELD(u16_t flags);
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| 83 | PACK_STRUCT_FIELD(ip_addr_p_t ciaddr);
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| 84 | PACK_STRUCT_FIELD(ip_addr_p_t yiaddr);
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| 85 | PACK_STRUCT_FIELD(ip_addr_p_t siaddr);
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| 86 | PACK_STRUCT_FIELD(ip_addr_p_t giaddr);
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| 87 | PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);
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| 88 | PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);
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| 89 | PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);
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| 90 | PACK_STRUCT_FIELD(u32_t cookie);
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| 91 | #define DHCP_MIN_OPTIONS_LEN 68U
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| 92 | /** make sure user does not configure this too small */
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| 93 | #if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
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| 94 | # undef DHCP_OPTIONS_LEN
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| 95 | #endif
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| 96 | /** allow this to be configured in lwipopts.h, but not too small */
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| 97 | #if (!defined(DHCP_OPTIONS_LEN))
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| 98 | /** set this to be sufficient for your options in outgoing DHCP msgs */
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| 99 | # define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
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| 100 | #endif
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| 101 | PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);
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| 102 | } PACK_STRUCT_STRUCT;
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| 103 | PACK_STRUCT_END
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| 104 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 105 | # include "arch/epstruct.h"
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| 106 | #endif
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| 107 |
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| 108 | void dhcp_set_struct(struct netif *netif, struct dhcp *dhcp);
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| 109 | /** Remove a struct dhcp previously set to the netif using dhcp_set_struct() */
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| 110 | #define dhcp_remove_struct(netif) do { (netif)->dhcp = NULL; } while(0)
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| 111 | void dhcp_cleanup(struct netif *netif);
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| 112 | /** start DHCP configuration */
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| 113 | err_t dhcp_start(struct netif *netif);
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| 114 | /** enforce early lease renewal (not needed normally)*/
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| 115 | err_t dhcp_renew(struct netif *netif);
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| 116 | /** release the DHCP lease, usually called before dhcp_stop()*/
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| 117 | err_t dhcp_release(struct netif *netif);
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| 118 | /** stop DHCP configuration */
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| 119 | void dhcp_stop(struct netif *netif);
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| 120 | /** inform server of our manual IP address */
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| 121 | void dhcp_inform(struct netif *netif);
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| 122 | /** Handle a possible change in the network configuration */
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| 123 | void dhcp_network_changed(struct netif *netif);
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| 124 |
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| 125 | /** if enabled, check whether the offered IP address is not in use, using ARP */
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| 126 | #if DHCP_DOES_ARP_CHECK
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| 127 | void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr);
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| 128 | #endif
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| 129 |
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| 130 | /** to be called every minute */
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| 131 | void dhcp_coarse_tmr(void);
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| 132 | /** to be called every half second */
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| 133 | void dhcp_fine_tmr(void);
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| 134 |
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| 135 | /** DHCP message item offsets and length */
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| 136 | #define DHCP_OP_OFS 0
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| 137 | #define DHCP_HTYPE_OFS 1
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| 138 | #define DHCP_HLEN_OFS 2
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| 139 | #define DHCP_HOPS_OFS 3
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| 140 | #define DHCP_XID_OFS 4
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| 141 | #define DHCP_SECS_OFS 8
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| 142 | #define DHCP_FLAGS_OFS 10
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| 143 | #define DHCP_CIADDR_OFS 12
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| 144 | #define DHCP_YIADDR_OFS 16
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| 145 | #define DHCP_SIADDR_OFS 20
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| 146 | #define DHCP_GIADDR_OFS 24
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| 147 | #define DHCP_CHADDR_OFS 28
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| 148 | #define DHCP_SNAME_OFS 44
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| 149 | #define DHCP_FILE_OFS 108
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| 150 | #define DHCP_MSG_LEN 236
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| 151 |
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| 152 | #define DHCP_COOKIE_OFS DHCP_MSG_LEN
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| 153 | #define DHCP_OPTIONS_OFS (DHCP_MSG_LEN + 4)
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| 154 |
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| 155 | #define DHCP_CLIENT_PORT 68
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| 156 | #define DHCP_SERVER_PORT 67
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| 157 |
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| 158 | /** DHCP client states */
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| 159 | #define DHCP_OFF 0
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| 160 | #define DHCP_REQUESTING 1
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| 161 | #define DHCP_INIT 2
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| 162 | #define DHCP_REBOOTING 3
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| 163 | #define DHCP_REBINDING 4
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| 164 | #define DHCP_RENEWING 5
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| 165 | #define DHCP_SELECTING 6
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| 166 | #define DHCP_INFORMING 7
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| 167 | #define DHCP_CHECKING 8
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| 168 | #define DHCP_PERMANENT 9
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| 169 | #define DHCP_BOUND 10
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| 170 | /** not yet implemented #define DHCP_RELEASING 11 */
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| 171 | #define DHCP_BACKING_OFF 12
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| 172 |
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| 173 | /** AUTOIP cooperatation flags */
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| 174 | #define DHCP_AUTOIP_COOP_STATE_OFF 0
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| 175 | #define DHCP_AUTOIP_COOP_STATE_ON 1
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| 176 |
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| 177 | #define DHCP_BOOTREQUEST 1
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| 178 | #define DHCP_BOOTREPLY 2
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| 179 |
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| 180 | /** DHCP message types */
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| 181 | #define DHCP_DISCOVER 1
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| 182 | #define DHCP_OFFER 2
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| 183 | #define DHCP_REQUEST 3
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| 184 | #define DHCP_DECLINE 4
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| 185 | #define DHCP_ACK 5
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| 186 | #define DHCP_NAK 6
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| 187 | #define DHCP_RELEASE 7
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| 188 | #define DHCP_INFORM 8
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| 189 |
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| 190 | /** DHCP hardware type, currently only ethernet is supported */
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| 191 | #define DHCP_HTYPE_ETH 1
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| 192 |
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| 193 | #define DHCP_MAGIC_COOKIE 0x63825363UL
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| 194 |
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| 195 | /* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */
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| 196 |
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| 197 | /** BootP options */
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| 198 | #define DHCP_OPTION_PAD 0
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| 199 | #define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
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| 200 | #define DHCP_OPTION_ROUTER 3
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| 201 | #define DHCP_OPTION_DNS_SERVER 6
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| 202 | #define DHCP_OPTION_HOSTNAME 12
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| 203 | #define DHCP_OPTION_IP_TTL 23
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| 204 | #define DHCP_OPTION_MTU 26
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| 205 | #define DHCP_OPTION_BROADCAST 28
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| 206 | #define DHCP_OPTION_TCP_TTL 37
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| 207 | #define DHCP_OPTION_END 255
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| 208 |
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| 209 | /** DHCP options */
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| 210 | #define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */
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| 211 | #define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
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| 212 | #define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */
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| 213 |
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| 214 | #define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */
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| 215 | #define DHCP_OPTION_MESSAGE_TYPE_LEN 1
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| 216 |
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| 217 | #define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */
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| 218 | #define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
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| 219 |
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| 220 | #define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */
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| 221 | #define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
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| 222 |
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| 223 | #define DHCP_OPTION_T1 58 /* T1 renewal time */
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| 224 | #define DHCP_OPTION_T2 59 /* T2 rebinding time */
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| 225 | #define DHCP_OPTION_US 60
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| 226 | #define DHCP_OPTION_CLIENT_ID 61
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| 227 | #define DHCP_OPTION_TFTP_SERVERNAME 66
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| 228 | #define DHCP_OPTION_BOOTFILE 67
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| 229 |
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| 230 | /** possible combinations of overloading the file and sname fields with options */
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| 231 | #define DHCP_OVERLOAD_NONE 0
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| 232 | #define DHCP_OVERLOAD_FILE 1
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| 233 | #define DHCP_OVERLOAD_SNAME 2
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| 234 | #define DHCP_OVERLOAD_SNAME_FILE 3
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| 235 |
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| 236 | #ifdef __cplusplus
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| 237 | }
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| 238 | #endif
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| 239 |
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| 240 | #endif /* LWIP_DHCP */
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| 241 |
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| 242 | #endif /*__LWIP_DHCP_H__*/
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