release/src/router/busybox/networking/udhcp/common.h

   1 /* vi: set sw=4 ts=4: */
   2 /* common.h
   3  *
   4  * Russ Dill <Russ.Dill@asu.edu> September 2001
   5  * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8  */
   9 #ifndef UDHCP_COMMON_H
  10 #define UDHCP_COMMON_H 1
  11
  12 #include "libbb.h"
  13 #include <netinet/udp.h>
  14 #include <netinet/ip.h>
  15
  16 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
  17
  18 #define DEFAULT_SCRIPT   CONFIG_UDHCPC_DEFAULT_SCRIPT
  19
  20 extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
  21
  22 /*** packet.h ***/
  23
  24 #define DHCP_OPTIONS_BUFSIZE  308
  25
  26 struct dhcpMessage {
  27         uint8_t op;      /* 1 = BOOTREQUEST, 2 = BOOTREPLY */
  28         uint8_t htype;   /* hardware address type. 1 = 10mb ethernet */
  29         uint8_t hlen;    /* hardware address length */
  30         uint8_t hops;    /* used by relay agents only */
  31         uint32_t xid;    /* unique id */
  32         uint16_t secs;   /* elapsed since client began acquisition/renewal */
  33         uint16_t flags;  /* only one flag so far: */
  34 #define BROADCAST_FLAG 0x8000 /* "I need broadcast replies" */
  35         uint32_t ciaddr; /* client IP (if client is in BOUND, RENEW or REBINDING state) */
  36         uint32_t yiaddr; /* 'your' (client) IP address */
  37         uint32_t siaddr; /* IP address of next server to use in bootstrap,
  38                           * returned in DHCPOFFER, DHCPACK by server */
  39         uint32_t giaddr; /* relay agent IP address */
  40         uint8_t chaddr[16];/* link-layer client hardware address (MAC) */
  41         uint8_t sname[64]; /* server host name (ASCIZ) */
  42         uint8_t file[128]; /* boot file name (ASCIZ) */
  43         uint32_t cookie;   /* fixed first four option bytes (99,130,83,99 dec) */
  44         uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
  45 } PACKED;
  46
  47 struct udp_dhcp_packet {
  48         struct iphdr ip;
  49         struct udphdr udp;
  50         struct dhcpMessage data;
  51 } PACKED;
  52
  53 /* Let's see whether compiler understood us right */
  54 struct BUG_bad_sizeof_struct_udp_dhcp_packet {
  55         char BUG_bad_sizeof_struct_udp_dhcp_packet
  56                 [(sizeof(struct udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
  57 };
  58
  59 uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
  60
  61 void udhcp_init_header(struct dhcpMessage *packet, char type) FAST_FUNC;
  62
  63 /*int udhcp_recv_raw_packet(struct dhcpMessage *payload, int fd); - in dhcpc.h */
  64 int udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd) FAST_FUNC;
  65
  66 int udhcp_send_raw_packet(struct dhcpMessage *payload,
  67                 uint32_t source_ip, int source_port,
  68                 uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
  69                 int ifindex) FAST_FUNC;
  70
  71 int udhcp_send_kernel_packet(struct dhcpMessage *payload,
  72                 uint32_t source_ip, int source_port,
  73                 uint32_t dest_ip, int dest_port) FAST_FUNC;
  74
  75 extern int minpkt;      // zzz
  76
  77 /**/
  78
  79 void udhcp_run_script(struct dhcpMessage *packet, const char *name) FAST_FUNC;
  80
  81 // Still need to clean these up...
  82
  83 /* from options.h */
  84 #define get_option              udhcp_get_option
  85 #define end_option              udhcp_end_option
  86 #define add_option_string       udhcp_add_option_string
  87 #define add_simple_option       udhcp_add_simple_option
  88
  89 void udhcp_sp_setup(void) FAST_FUNC;
  90 int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
  91 int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
  92 int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp) FAST_FUNC;
  93 int udhcp_raw_socket(int ifindex) FAST_FUNC;
  94 int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC;
  95 /* Returns 1 if no reply received */
  96 int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *interface) FAST_FUNC;
  97
  98 #if ENABLE_UDHCP_DEBUG
  99 # define DEBUG(str, args...) bb_info_msg("### " str, ## args)
 100 #else
 101 # define DEBUG(str, args...) do {;} while (0)
 102 #endif
 103
 104 POP_SAVED_FUNCTION_VISIBILITY
 105
 106 #endif