FreeRTOS/Common/ethernet/lwIP_130/src/include/lwip/dhcp.h

   1 /** @file
   2  */
   3
   4 #ifndef __LWIP_DHCP_H__
   5 #define __LWIP_DHCP_H__
   6
   7 #include "lwip/opt.h"
   8
   9 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
  10
  11 #include "lwip/netif.h"
  12 #include "lwip/udp.h"
  13
  14 #ifdef __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 /** period (in seconds) of the application calling dhcp_coarse_tmr() */
  19 #define DHCP_COARSE_TIMER_SECS 60
  20 /** period (in milliseconds) of the application calling dhcp_coarse_tmr() */
  21 #define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS*1000)
  22 /** period (in milliseconds) of the application calling dhcp_fine_tmr() */
  23 #define DHCP_FINE_TIMER_MSECS 500
  24
  25 struct dhcp
  26 {
  27   /** current DHCP state machine state */
  28   u8_t state;
  29   /** retries of current request */
  30   u8_t tries;
  31   /** transaction identifier of last sent request */
  32   u32_t xid;
  33   /** our connection to the DHCP server */
  34   struct udp_pcb *pcb;
  35   /** (first) pbuf of incoming msg */
  36   struct pbuf *p;
  37   /** incoming msg */
  38   struct dhcp_msg *msg_in;
  39   /** incoming msg options */
  40   struct dhcp_msg *options_in;
  41   /** ingoing msg options length */
  42   u16_t options_in_len;
  43
  44   struct pbuf *p_out; /* pbuf of outcoming msg */
  45   struct dhcp_msg *msg_out; /* outgoing msg */
  46   u16_t options_out_len; /* outgoing msg options length */
  47   u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */
  48   u16_t t1_timeout;  /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */
  49   u16_t t2_timeout;  /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */
  50   struct ip_addr server_ip_addr; /* dhcp server address that offered this lease */
  51   struct ip_addr offered_ip_addr;
  52   struct ip_addr offered_sn_mask;
  53   struct ip_addr offered_gw_addr;
  54   struct ip_addr offered_bc_addr;
  55 #define DHCP_MAX_DNS 2
  56   u32_t dns_count; /* actual number of DNS servers obtained */
  57   struct ip_addr offered_dns_addr[DHCP_MAX_DNS]; /* DNS server addresses */
  58
  59   u32_t offered_t0_lease; /* lease period (in seconds) */
  60   u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
  61   u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period)  */
  62 #if LWIP_DHCP_AUTOIP_COOP
  63   u8_t autoip_coop_state;
  64 #endif
  65 /** Patch #1308
  66  *  TODO: See dhcp.c "TODO"s
  67  */
  68 #if 0
  69   struct ip_addr offered_si_addr;
  70   u8_t *boot_file_name;
  71 #endif
  72 };
  73
  74 /* MUST be compiled with "pack structs" or equivalent! */
  75 #ifdef PACK_STRUCT_USE_INCLUDES
  76 #  include "arch/bpstruct.h"
  77 #endif
  78 PACK_STRUCT_BEGIN
  79 #if (defined(__MWERKS__)  || defined(__CWCC__))
  80         #pragma options align= packed
  81 #endif
  82 /** minimum set of fields of any DHCP message */
  83 struct dhcp_msg
  84 {
  85   PACK_STRUCT_FIELD(u8_t op);
  86   PACK_STRUCT_FIELD(u8_t htype);
  87   PACK_STRUCT_FIELD(u8_t hlen);
  88   PACK_STRUCT_FIELD(u8_t hops);
  89   PACK_STRUCT_FIELD(u32_t xid);
  90   PACK_STRUCT_FIELD(u16_t secs);
  91   PACK_STRUCT_FIELD(u16_t flags);
  92   PACK_STRUCT_FIELD(struct ip_addr ciaddr);
  93   PACK_STRUCT_FIELD(struct ip_addr yiaddr);
  94   PACK_STRUCT_FIELD(struct ip_addr siaddr);
  95   PACK_STRUCT_FIELD(struct ip_addr giaddr);
  96 #define DHCP_CHADDR_LEN 16U
  97   PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);
  98 #define DHCP_SNAME_LEN 64U
  99   PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);
 100 #define DHCP_FILE_LEN 128U
 101   PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);
 102   PACK_STRUCT_FIELD(u32_t cookie);
 103 #define DHCP_MIN_OPTIONS_LEN 68U
 104 /** make sure user does not configure this too small */
 105 #if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
 106 #  undef DHCP_OPTIONS_LEN
 107 #endif
 108 /** allow this to be configured in lwipopts.h, but not too small */
 109 #if (!defined(DHCP_OPTIONS_LEN))
 110 /** set this to be sufficient for your options in outgoing DHCP msgs */
 111 #  define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
 112 #endif
 113   PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);
 114 } PACK_STRUCT_STRUCT;
 115 PACK_STRUCT_END
 116 #ifdef PACK_STRUCT_USE_INCLUDES
 117 #  include "arch/epstruct.h"
 118 #endif
 119
 120 /** start DHCP configuration */
 121 err_t dhcp_start(struct netif *netif);
 122 /** enforce early lease renewal (not needed normally)*/
 123 err_t dhcp_renew(struct netif *netif);
 124 /** release the DHCP lease, usually called before dhcp_stop()*/
 125 err_t dhcp_release(struct netif *netif);
 126 /** stop DHCP configuration */
 127 void dhcp_stop(struct netif *netif);
 128 /** inform server of our manual IP address */
 129 void dhcp_inform(struct netif *netif);
 130
 131 /** if enabled, check whether the offered IP address is not in use, using ARP */
 132 #if DHCP_DOES_ARP_CHECK
 133 void dhcp_arp_reply(struct netif *netif, struct ip_addr *addr);
 134 #endif
 135
 136 /** to be called every minute */
 137 void dhcp_coarse_tmr(void);
 138 /** to be called every half second */
 139 void dhcp_fine_tmr(void);
 140
 141 /** DHCP message item offsets and length */
 142 #define DHCP_MSG_OFS (UDP_DATA_OFS)
 143   #define DHCP_OP_OFS (DHCP_MSG_OFS + 0)
 144   #define DHCP_HTYPE_OFS (DHCP_MSG_OFS + 1)
 145   #define DHCP_HLEN_OFS (DHCP_MSG_OFS + 2)
 146   #define DHCP_HOPS_OFS (DHCP_MSG_OFS + 3)
 147   #define DHCP_XID_OFS (DHCP_MSG_OFS + 4)
 148   #define DHCP_SECS_OFS (DHCP_MSG_OFS + 8)
 149   #define DHCP_FLAGS_OFS (DHCP_MSG_OFS + 10)
 150   #define DHCP_CIADDR_OFS (DHCP_MSG_OFS + 12)
 151   #define DHCP_YIADDR_OFS (DHCP_MSG_OFS + 16)
 152   #define DHCP_SIADDR_OFS (DHCP_MSG_OFS + 20)
 153   #define DHCP_GIADDR_OFS (DHCP_MSG_OFS + 24)
 154   #define DHCP_CHADDR_OFS (DHCP_MSG_OFS + 28)
 155   #define DHCP_SNAME_OFS (DHCP_MSG_OFS + 44)
 156   #define DHCP_FILE_OFS (DHCP_MSG_OFS + 108)
 157 #define DHCP_MSG_LEN 236
 158
 159 #define DHCP_COOKIE_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN)
 160 #define DHCP_OPTIONS_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN + 4)
 161
 162 #define DHCP_CLIENT_PORT 68
 163 #define DHCP_SERVER_PORT 67
 164
 165 /** DHCP client states */
 166 #define DHCP_REQUESTING 1
 167 #define DHCP_INIT 2
 168 #define DHCP_REBOOTING 3
 169 #define DHCP_REBINDING 4
 170 #define DHCP_RENEWING 5
 171 #define DHCP_SELECTING 6
 172 #define DHCP_INFORMING 7
 173 #define DHCP_CHECKING 8
 174 #define DHCP_PERMANENT 9
 175 #define DHCP_BOUND 10
 176 /** not yet implemented #define DHCP_RELEASING 11 */
 177 #define DHCP_BACKING_OFF 12
 178 #define DHCP_OFF 13
 179
 180 /** AUTOIP cooperatation flags */
 181 #define DHCP_AUTOIP_COOP_STATE_OFF 0
 182 #define DHCP_AUTOIP_COOP_STATE_ON 1
 183
 184 #define DHCP_BOOTREQUEST 1
 185 #define DHCP_BOOTREPLY 2
 186
 187 #define DHCP_DISCOVER 1
 188 #define DHCP_OFFER 2
 189 #define DHCP_REQUEST 3
 190 #define DHCP_DECLINE 4
 191 #define DHCP_ACK 5
 192 #define DHCP_NAK 6
 193 #define DHCP_RELEASE 7
 194 #define DHCP_INFORM 8
 195
 196 #define DHCP_HTYPE_ETH 1
 197
 198 #define DHCP_HLEN_ETH 6
 199
 200 #define DHCP_BROADCAST_FLAG 15
 201 #define DHCP_BROADCAST_MASK (1 << DHCP_FLAG_BROADCAST)
 202
 203 /** BootP options */
 204 #define DHCP_OPTION_PAD 0
 205 #define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
 206 #define DHCP_OPTION_ROUTER 3
 207 #define DHCP_OPTION_DNS_SERVER 6
 208 #define DHCP_OPTION_HOSTNAME 12
 209 #define DHCP_OPTION_IP_TTL 23
 210 #define DHCP_OPTION_MTU 26
 211 #define DHCP_OPTION_BROADCAST 28
 212 #define DHCP_OPTION_TCP_TTL 37
 213 #define DHCP_OPTION_END 255
 214
 215 /** DHCP options */
 216 #define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */
 217 #define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
 218 #define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */
 219
 220 #define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */
 221 #define DHCP_OPTION_MESSAGE_TYPE_LEN 1
 222
 223
 224 #define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */
 225 #define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
 226
 227 #define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */
 228 #define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
 229
 230 #define DHCP_OPTION_T1 58 /* T1 renewal time */
 231 #define DHCP_OPTION_T2 59 /* T2 rebinding time */
 232 #define DHCP_OPTION_US 60
 233 #define DHCP_OPTION_CLIENT_ID 61
 234 #define DHCP_OPTION_TFTP_SERVERNAME 66
 235 #define DHCP_OPTION_BOOTFILE 67
 236
 237 /** possible combinations of overloading the file and sname fields with options */
 238 #define DHCP_OVERLOAD_NONE 0
 239 #define DHCP_OVERLOAD_FILE 1
 240 #define DHCP_OVERLOAD_SNAME  2
 241 #define DHCP_OVERLOAD_SNAME_FILE 3
 242
 243 #ifdef __cplusplus
 244 }
 245 #endif
 246
 247 #endif /* LWIP_DHCP */
 248
 249 #endif /*__LWIP_DHCP_H__*/