net/nfs.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Masami Komiya <mkomiya@sonare.it> 2004
   4  */
   5
   6 #ifndef __NFS_H__
   7 #define __NFS_H__
   8
   9 #define SUNRPC_PORT     111
  10
  11 #define PROG_PORTMAP    100000
  12 #define PROG_NFS        100003
  13 #define PROG_MOUNT      100005
  14
  15 #define MSG_CALL        0
  16 #define MSG_REPLY       1
  17
  18 #define PORTMAP_GETPORT 3
  19
  20 #define MOUNT_ADDENTRY  1
  21 #define MOUNT_UMOUNTALL 4
  22
  23 #define NFS_LOOKUP      4
  24 #define NFS_READLINK    5
  25 #define NFS_READ        6
  26
  27 #define NFS3PROC_LOOKUP 3
  28
  29 #define NFS_FHSIZE      32
  30 #define NFS3_FHSIZE     64
  31
  32 #define NFSERR_PERM     1
  33 #define NFSERR_NOENT    2
  34 #define NFSERR_ACCES    13
  35 #define NFSERR_ISDIR    21
  36 #define NFSERR_INVAL    22
  37
  38 /*
  39  * Block size used for NFS read accesses.  A RPC reply packet (including  all
  40  * headers) must fit within a single Ethernet frame to avoid fragmentation.
  41  * However, if CONFIG_IP_DEFRAG is set, a bigger value could be used.  In any
  42  * case, most NFS servers are optimized for a power of 2.
  43  */
  44 #define NFS_READ_SIZE   1024    /* biggest power of two that fits Ether frame */
  45 #define NFS_MAX_ATTRS   26
  46
  47 /* Values for Accept State flag on RPC answers (See: rfc1831) */
  48 enum rpc_accept_stat {
  49         NFS_RPC_SUCCESS = 0,    /* RPC executed successfully */
  50         NFS_RPC_PROG_UNAVAIL = 1,       /* remote hasn't exported program */
  51         NFS_RPC_PROG_MISMATCH = 2,      /* remote can't support version # */
  52         NFS_RPC_PROC_UNAVAIL = 3,       /* program can't support procedure */
  53         NFS_RPC_GARBAGE_ARGS = 4,       /* procedure can't decode params */
  54         NFS_RPC_SYSTEM_ERR = 5  /* errors like memory allocation failure */
  55 };
  56
  57 struct rpc_t {
  58         union {
  59                 uint8_t data[NFS_READ_SIZE + (6 + NFS_MAX_ATTRS) *
  60                         sizeof(uint32_t)];
  61                 struct {
  62                         uint32_t id;
  63                         uint32_t type;
  64                         uint32_t rpcvers;
  65                         uint32_t prog;
  66                         uint32_t vers;
  67                         uint32_t proc;
  68                         uint32_t data[1];
  69                 } call;
  70                 struct {
  71                         uint32_t id;
  72                         uint32_t type;
  73                         uint32_t rstatus;
  74                         uint32_t verifier;
  75                         uint32_t v2;
  76                         uint32_t astatus;
  77                         uint32_t data[NFS_READ_SIZE / sizeof(uint32_t) +
  78                                 NFS_MAX_ATTRS];
  79                 } reply;
  80         } u;
  81 } __attribute__((packed));
  82 void nfs_start(void);   /* Begin NFS */
  83
  84
  85 /**********************************************************************/
  86
  87 #endif /* __NFS_H__ */