SAMV71 Xplained Ultra Software Package 1.4

dhcp.h

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00001  /** 
00002  @file
00003  */
00004 
00005 #ifndef __LWIP_DHCP_H__
00006 #define __LWIP_DHCP_H__
00007 
00008 #include "lwip/opt.h"
00009 
00010 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
00011 
00012 #include "lwip/netif.h"
00013 #include "lwip/udp.h"
00014 
00015 #ifdef __cplusplus
00016 extern "C" {
00017 #endif
00018 
00019 /** period (in seconds) of the application calling dhcp_coarse_tmr() */
00020 #define DHCP_COARSE_TIMER_SECS 60 
00021 /** period (in milliseconds) of the application calling dhcp_coarse_tmr() */
00022 #define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)
00023 /** period (in milliseconds) of the application calling dhcp_fine_tmr() */
00024 #define DHCP_FINE_TIMER_MSECS 500 
00025 
00026 struct dhcp
00027 {
00028   /** transaction identifier of last sent request */ 
00029   u32_t xid;
00030   /** our connection to the DHCP server */ 
00031   struct udp_pcb *pcb;
00032   /** incoming msg */
00033   struct dhcp_msg *msg_in;
00034   /** incoming msg options */
00035   void *options_in; 
00036   /** ingoing msg options length */
00037   u16_t options_in_len;
00038   /** current DHCP state machine state */
00039   u8_t state;
00040   /** retries of current request */
00041   u8_t tries;
00042 
00043   struct pbuf *p_out; /* pbuf of outcoming msg */
00044   struct dhcp_msg *msg_out; /* outgoing msg */
00045   u16_t options_out_len; /* outgoing msg options length */
00046   u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */
00047   u16_t t1_timeout;  /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */
00048   u16_t t2_timeout;  /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */
00049   struct ip_addr server_ip_addr; /* dhcp server address that offered this lease */
00050   struct ip_addr offered_ip_addr;
00051   struct ip_addr offered_sn_mask;
00052   struct ip_addr offered_gw_addr;
00053   struct ip_addr offered_bc_addr;
00054 #define DHCP_MAX_DNS 2
00055   u32_t dns_count; /* actual number of DNS servers obtained */
00056   struct ip_addr offered_dns_addr[DHCP_MAX_DNS]; /* DNS server addresses */
00057  
00058   u32_t offered_t0_lease; /* lease period (in seconds) */
00059   u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
00060   u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period)  */
00061 #if LWIP_DHCP_AUTOIP_COOP
00062   u8_t autoip_coop_state;
00063 #endif
00064 /** Patch #1308
00065  *  TODO: See dhcp.c "TODO"s
00066  */
00067 #if 0
00068   struct ip_addr offered_si_addr;
00069   u8_t *boot_file_name;
00070 #endif
00071 };
00072 
00073 /* MUST be compiled with "pack structs" or equivalent! */
00074 #ifdef PACK_STRUCT_USE_INCLUDES
00075 #  include "arch/bpstruct.h"
00076 #endif
00077 PACK_STRUCT_BEGIN
00078 /** minimum set of fields of any DHCP message */
00079 struct dhcp_msg
00080 {
00081   PACK_STRUCT_FIELD(u8_t op);
00082   PACK_STRUCT_FIELD(u8_t htype);
00083   PACK_STRUCT_FIELD(u8_t hlen);
00084   PACK_STRUCT_FIELD(u8_t hops);
00085   PACK_STRUCT_FIELD(u32_t xid);
00086   PACK_STRUCT_FIELD(u16_t secs);
00087   PACK_STRUCT_FIELD(u16_t flags);
00088   PACK_STRUCT_FIELD(struct ip_addr ciaddr);
00089   PACK_STRUCT_FIELD(struct ip_addr yiaddr);
00090   PACK_STRUCT_FIELD(struct ip_addr siaddr);
00091   PACK_STRUCT_FIELD(struct ip_addr giaddr);
00092 #define DHCP_CHADDR_LEN 16U
00093   PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);
00094 #define DHCP_SNAME_LEN 64U
00095   PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);
00096 #define DHCP_FILE_LEN 128U
00097   PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);
00098   PACK_STRUCT_FIELD(u32_t cookie);
00099 #define DHCP_MIN_OPTIONS_LEN 68U
00100 /** make sure user does not configure this too small */
00101 #if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
00102 #  undef DHCP_OPTIONS_LEN
00103 #endif
00104 /** allow this to be configured in lwipopts.h, but not too small */
00105 #if (!defined(DHCP_OPTIONS_LEN))
00106 /** set this to be sufficient for your options in outgoing DHCP msgs */
00107 #  define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
00108 #endif
00109   PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);
00110 } PACK_STRUCT_STRUCT;
00111 PACK_STRUCT_END
00112 #ifdef PACK_STRUCT_USE_INCLUDES
00113 #  include "arch/epstruct.h"
00114 #endif
00115 
00116 /** start DHCP configuration */
00117 err_t dhcp_start(struct netif *netif);
00118 /** enforce early lease renewal (not needed normally)*/
00119 err_t dhcp_renew(struct netif *netif);
00120 /** release the DHCP lease, usually called before dhcp_stop()*/
00121 err_t dhcp_release(struct netif *netif);
00122 /** stop DHCP configuration */
00123 void dhcp_stop(struct netif *netif);
00124 /** inform server of our manual IP address */
00125 void dhcp_inform(struct netif *netif);
00126 /** Handle a possible change in the network configuration */
00127 void dhcp_network_changed(struct netif *netif);
00128 
00129 /** if enabled, check whether the offered IP address is not in use, using ARP */
00130 #if DHCP_DOES_ARP_CHECK
00131 void dhcp_arp_reply(struct netif *netif, struct ip_addr *addr);
00132 #endif
00133 
00134 /** to be called every minute */
00135 void dhcp_coarse_tmr(void);
00136 /** to be called every half second */
00137 void dhcp_fine_tmr(void);
00138  
00139 /** DHCP message item offsets and length */
00140 #define DHCP_MSG_OFS (UDP_DATA_OFS)  
00141   #define DHCP_OP_OFS (DHCP_MSG_OFS + 0)
00142   #define DHCP_HTYPE_OFS (DHCP_MSG_OFS + 1)
00143   #define DHCP_HLEN_OFS (DHCP_MSG_OFS + 2)
00144   #define DHCP_HOPS_OFS (DHCP_MSG_OFS + 3)
00145   #define DHCP_XID_OFS (DHCP_MSG_OFS + 4)
00146   #define DHCP_SECS_OFS (DHCP_MSG_OFS + 8)
00147   #define DHCP_FLAGS_OFS (DHCP_MSG_OFS + 10)
00148   #define DHCP_CIADDR_OFS (DHCP_MSG_OFS + 12)
00149   #define DHCP_YIADDR_OFS (DHCP_MSG_OFS + 16)
00150   #define DHCP_SIADDR_OFS (DHCP_MSG_OFS + 20)
00151   #define DHCP_GIADDR_OFS (DHCP_MSG_OFS + 24)
00152   #define DHCP_CHADDR_OFS (DHCP_MSG_OFS + 28)
00153   #define DHCP_SNAME_OFS (DHCP_MSG_OFS + 44)
00154   #define DHCP_FILE_OFS (DHCP_MSG_OFS + 108)
00155 #define DHCP_MSG_LEN 236
00156 
00157 #define DHCP_COOKIE_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN)
00158 #define DHCP_OPTIONS_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN + 4)
00159 
00160 #define DHCP_CLIENT_PORT 68  
00161 #define DHCP_SERVER_PORT 67
00162 
00163 /** DHCP client states */
00164 #define DHCP_REQUESTING 1
00165 #define DHCP_INIT 2
00166 #define DHCP_REBOOTING 3
00167 #define DHCP_REBINDING 4
00168 #define DHCP_RENEWING 5
00169 #define DHCP_SELECTING 6
00170 #define DHCP_INFORMING 7
00171 #define DHCP_CHECKING 8
00172 #define DHCP_PERMANENT 9
00173 #define DHCP_BOUND 10
00174 /** not yet implemented #define DHCP_RELEASING 11 */
00175 #define DHCP_BACKING_OFF 12
00176 #define DHCP_OFF 13
00177 
00178 /** AUTOIP cooperatation flags */
00179 #define DHCP_AUTOIP_COOP_STATE_OFF 0
00180 #define DHCP_AUTOIP_COOP_STATE_ON 1
00181  
00182 #define DHCP_BOOTREQUEST 1
00183 #define DHCP_BOOTREPLY 2
00184 
00185 #define DHCP_DISCOVER 1
00186 #define DHCP_OFFER 2
00187 #define DHCP_REQUEST 3
00188 #define DHCP_DECLINE 4
00189 #define DHCP_ACK 5
00190 #define DHCP_NAK 6
00191 #define DHCP_RELEASE 7
00192 #define DHCP_INFORM 8
00193 
00194 #define DHCP_HTYPE_ETH 1
00195 
00196 #define DHCP_HLEN_ETH 6
00197 
00198 #define DHCP_BROADCAST_FLAG 15
00199 #define DHCP_BROADCAST_MASK (1 << DHCP_FLAG_BROADCAST)
00200 
00201 /** BootP options */
00202 #define DHCP_OPTION_PAD 0
00203 #define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
00204 #define DHCP_OPTION_ROUTER 3
00205 #define DHCP_OPTION_DNS_SERVER 6 
00206 #define DHCP_OPTION_HOSTNAME 12
00207 #define DHCP_OPTION_IP_TTL 23
00208 #define DHCP_OPTION_MTU 26
00209 #define DHCP_OPTION_BROADCAST 28
00210 #define DHCP_OPTION_TCP_TTL 37
00211 #define DHCP_OPTION_END 255
00212 
00213 /** DHCP options */
00214 #define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */
00215 #define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
00216 #define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */
00217 
00218 #define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */
00219 #define DHCP_OPTION_MESSAGE_TYPE_LEN 1
00220 
00221 
00222 #define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */
00223 #define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
00224 
00225 #define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */
00226 #define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
00227 
00228 #define DHCP_OPTION_T1 58 /* T1 renewal time */
00229 #define DHCP_OPTION_T2 59 /* T2 rebinding time */
00230 #define DHCP_OPTION_US 60
00231 #define DHCP_OPTION_CLIENT_ID 61
00232 #define DHCP_OPTION_TFTP_SERVERNAME 66
00233 #define DHCP_OPTION_BOOTFILE 67
00234 
00235 /** possible combinations of overloading the file and sname fields with options */
00236 #define DHCP_OVERLOAD_NONE 0
00237 #define DHCP_OVERLOAD_FILE 1
00238 #define DHCP_OVERLOAD_SNAME  2
00239 #define DHCP_OVERLOAD_SNAME_FILE 3
00240 
00241 #ifdef __cplusplus
00242 }
00243 #endif
00244 
00245 #endif /* LWIP_DHCP */
00246 
00247 #endif /*__LWIP_DHCP_H__*/
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