usr/src/grub/grub-0.97/netboot/tftp.h

   1 #ifndef _TFTP_H
   2 #define _TFTP_H
   3
   4 #include "if_ether.h"
   5 #include "ip.h"
   6 #include "udp.h"
   7
   8 #ifndef MAX_TFTP_RETRIES
   9 #define MAX_TFTP_RETRIES        20
  10 #endif
  11
  12 /* These settings have sense only if compiled with -DCONGESTED */
  13 /* total retransmission timeout in ticks */
  14 #define TFTP_TIMEOUT            (30*TICKS_PER_SEC)
  15 /* packet retransmission timeout in ticks */
  16 #define TFTP_REXMT              (3*TICKS_PER_SEC)
  17
  18 #define TFTP_PORT       69
  19 #define TFTP_DEFAULTSIZE_PACKET 512
  20 #define TFTP_MAX_PACKET         1432 /* 512 */
  21
  22 #define TFTP_RRQ        1
  23 #define TFTP_WRQ        2
  24 #define TFTP_DATA       3
  25 #define TFTP_ACK        4
  26 #define TFTP_ERROR      5
  27 #define TFTP_OACK       6
  28
  29 #define TFTP_CODE_EOF   1
  30 #define TFTP_CODE_MORE  2
  31 #define TFTP_CODE_ERROR 3
  32 #define TFTP_CODE_BOOT  4
  33 #define TFTP_CODE_CFG   5
  34
  35 struct tftp_t {
  36         struct iphdr ip;
  37         struct udphdr udp;
  38         uint16_t opcode;
  39         union {
  40                 uint8_t rrq[TFTP_DEFAULTSIZE_PACKET];
  41                 struct {
  42                         uint16_t block;
  43                         uint8_t  download[TFTP_MAX_PACKET];
  44                 } data;
  45                 struct {
  46                         uint16_t block;
  47                 } ack;
  48                 struct {
  49                         uint16_t errcode;
  50                         uint8_t  errmsg[TFTP_DEFAULTSIZE_PACKET];
  51                 } err;
  52                 struct {
  53                         uint8_t  data[TFTP_DEFAULTSIZE_PACKET+2];
  54                 } oack;
  55         } u;
  56 };
  57
  58 /* define a smaller tftp packet solely for making requests to conserve stack
  59    512 bytes should be enough */
  60 struct tftpreq_t {
  61         struct iphdr ip;
  62         struct udphdr udp;
  63         uint16_t opcode;
  64         union {
  65                 uint8_t rrq[512];
  66                 struct {
  67                         uint16_t block;
  68                 } ack;
  69                 struct {
  70                         uint16_t errcode;
  71                         uint8_t  errmsg[512-2];
  72                 } err;
  73         } u;
  74 };
  75
  76 #define TFTP_MIN_PACKET (sizeof(struct iphdr) + sizeof(struct udphdr) + 4)
  77
  78 typedef int (*read_actor_t)(unsigned char *, unsigned int, unsigned int, int);
  79
  80 int tftp_file_read(const char *name, read_actor_t);
  81
  82 #endif  /* _TFTP_H */