LXR busybox/networking/udhcp/options.h

   1/* vi: set sw=4 ts=4: */
   2/* options.h */
   3#ifndef UDHCP_OPTIONS_H
   4#define UDHCP_OPTIONS_H 1
   5
   6PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
   7
   8#define TYPE_MASK       0x0F
   9
  10enum {
  11        OPTION_IP = 1,
  12        OPTION_IP_PAIR,
  13        OPTION_STRING,
  14#if ENABLE_FEATURE_UDHCP_RFC3397
  15        OPTION_STR1035, /* RFC1035 compressed domain name list */
  16#endif
  17        OPTION_BOOLEAN,
  18        OPTION_U8,
  19        OPTION_U16,
  20        OPTION_S16,
  21        OPTION_U32,
  22        OPTION_S32
  23};
  24
  25#define OPTION_REQ      0x10 /* have the client request this option */
  26#define OPTION_LIST     0x20 /* There can be a list of 1 or more of these */
  27
  28/*****************************************************************/
  29/* Do not modify below here unless you know what you are doing!! */
  30/*****************************************************************/
  31
  32/* DHCP protocol -- see RFC 2131 */
  33#define DHCP_MAGIC              0x63825363
  34
  35/* DHCP option codes (partial list) */
  36#define DHCP_PADDING            0x00
  37#define DHCP_SUBNET             0x01
  38#define DHCP_TIME_OFFSET        0x02
  39#define DHCP_ROUTER             0x03
  40#define DHCP_TIME_SERVER        0x04
  41#define DHCP_NAME_SERVER        0x05
  42#define DHCP_DNS_SERVER         0x06
  43#define DHCP_LOG_SERVER         0x07
  44#define DHCP_COOKIE_SERVER      0x08
  45#define DHCP_LPR_SERVER         0x09
  46#define DHCP_HOST_NAME          0x0c
  47#define DHCP_BOOT_SIZE          0x0d
  48#define DHCP_DOMAIN_NAME        0x0f
  49#define DHCP_SWAP_SERVER        0x10
  50#define DHCP_ROOT_PATH          0x11
  51#define DHCP_IP_TTL             0x17
  52#define DHCP_MTU                0x1a
  53#define DHCP_BROADCAST          0x1c
  54#define DHCP_NTP_SERVER         0x2a
  55#define DHCP_WINS_SERVER        0x2c
  56#define DHCP_REQUESTED_IP       0x32
  57#define DHCP_LEASE_TIME         0x33
  58#define DHCP_OPTION_OVERLOAD    0x34
  59#define DHCP_MESSAGE_TYPE       0x35
  60#define DHCP_SERVER_ID          0x36
  61#define DHCP_PARAM_REQ          0x37
  62#define DHCP_MESSAGE            0x38
  63#define DHCP_MAX_SIZE           0x39
  64#define DHCP_T1                 0x3a
  65#define DHCP_T2                 0x3b
  66#define DHCP_VENDOR             0x3c
  67#define DHCP_CLIENT_ID          0x3d
  68#define DHCP_FQDN               0x51
  69#define DHCP_END                0xFF
  70/* Offsets in option byte sequence */
  71#define OPT_CODE                0
  72#define OPT_LEN                 1
  73#define OPT_DATA                2
  74/* Bits in "overload" option */
  75#define OPTION_FIELD            0
  76#define FILE_FIELD              1
  77#define SNAME_FIELD             2
  78
  79#define BOOTREQUEST             1
  80#define BOOTREPLY               2
  81
  82#define ETH_10MB                1
  83#define ETH_10MB_LEN            6
  84
  85#define DHCPDISCOVER            1 /* client -> server */
  86#define DHCPOFFER               2 /* client <- server */
  87#define DHCPREQUEST             3 /* client -> server */
  88#define DHCPDECLINE             4 /* client -> server */
  89#define DHCPACK                 5 /* client <- server */
  90#define DHCPNAK                 6 /* client <- server */
  91#define DHCPRELEASE             7 /* client -> server */
  92#define DHCPINFORM              8 /* client -> server */
  93
  94struct dhcp_option {
  95        uint8_t flags;
  96        uint8_t code;
  97};
  98
  99extern const struct dhcp_option dhcp_options[];
 100extern const char dhcp_option_strings[];
 101extern const uint8_t dhcp_option_lengths[];
 102
 103uint8_t *get_option(struct dhcpMessage *packet, int code) FAST_FUNC;
 104int end_option(uint8_t *optionptr) FAST_FUNC;
 105int add_option_string(uint8_t *optionptr, uint8_t *string) FAST_FUNC;
 106int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC;
 107#if ENABLE_FEATURE_UDHCP_RFC3397
 108char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
 109uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
 110#endif
 111
 112POP_SAVED_FUNCTION_VISIBILITY
 113
 114#endif
 115