The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfsserver/nfs.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993, 1995
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)nfs.h       8.4 (Berkeley) 5/1/95
   35  * $FreeBSD: stable/12/sys/nfsserver/nfs.h 326023 2017-11-20 19:43:44Z pfg $
   36  */
   37 
   38 #ifndef _NFSSERVER_NFS_H_
   39 #define _NFSSERVER_NFS_H_
   40 
   41 #ifdef _KERNEL
   42 #include "opt_nfs.h"
   43 #endif
   44 
   45 #include <nfs/nfssvc.h>
   46 
   47 /*
   48  * Tunable constants for nfs
   49  */
   50 
   51 #define NFS_TICKINTVL   10              /* Desired time for a tick (msec) */
   52 #define NFS_HZ          (hz / nfs_ticks) /* Ticks/sec */
   53 #define NFS_TIMEO       (1 * NFS_HZ)    /* Default timeout = 1 second */
   54 #define NFS_MINTIMEO    (1 * NFS_HZ)    /* Min timeout to use */
   55 #define NFS_MAXTIMEO    (60 * NFS_HZ)   /* Max timeout to backoff to */
   56 #define NFS_MINIDEMTIMEO (5 * NFS_HZ)   /* Min timeout for non-idempotent ops*/
   57 #define NFS_MAXUIDHASH  64              /* Max. # of hashed uid entries/mp */
   58 #ifndef NFS_GATHERDELAY
   59 #define NFS_GATHERDELAY         10      /* Default write gather delay (msec) */
   60 #endif
   61 #ifdef _KERNEL
   62 #define DIRBLKSIZ       512             /* XXX we used to use ufs's DIRBLKSIZ */
   63 #endif
   64 
   65 /*
   66  * Oddballs
   67  */
   68 #define NFS_SRVMAXDATA(n) \
   69                 (((n)->nd_flag & ND_NFSV3) ? (((n)->nd_nam2) ? \
   70                  NFS_MAXDGRAMDATA : NFS_MAXDATA) : NFS_V2MAXDATA)
   71 
   72 /*
   73  * XXX
   74  * The B_INVAFTERWRITE flag should be set to whatever is required by the
   75  * buffer cache code to say "Invalidate the block after it is written back".
   76  */
   77 #define B_INVAFTERWRITE B_NOCACHE
   78 
   79 /*
   80  * The IO_METASYNC flag should be implemented for local filesystems.
   81  * (Until then, it is nothin at all.)
   82  */
   83 #ifndef IO_METASYNC
   84 #define IO_METASYNC     0
   85 #endif
   86 
   87 /* NFS state flags XXX -Wunused */
   88 #define NFSRV_SNDLOCK           0x01000000  /* Send socket lock */
   89 #define NFSRV_WANTSND           0x02000000  /* Want above */
   90 
   91 /*
   92  * Structures for the nfssvc(2) syscall.  Not that anyone but nfsd and
   93  * mount_nfs should ever try and use it.
   94  */
   95 
   96 /*
   97  * Add a socket to monitor for NFS requests.
   98  */
   99 struct nfsd_addsock_args {
  100         int     sock;           /* Socket to serve */
  101         caddr_t name;           /* Client addr for connection based sockets */
  102         int     namelen;        /* Length of name */
  103 };
  104 
  105 /*
  106  * Start processing requests.
  107  */
  108 struct nfsd_nfsd_args {
  109         const char *principal;  /* GSS-API service principal name */
  110         int     minthreads;     /* minimum service thread count */
  111         int     maxthreads;     /* maximum service thread count */
  112 };
  113 
  114 /*
  115  * XXX to allow amd to include nfs.h without nfsproto.h
  116  */
  117 #ifdef NFS_NPROCS
  118 #include <nfsserver/nfsrvstats.h>
  119 #endif
  120 
  121 /*
  122  * vfs.nfsrv sysctl(3) identifiers
  123  */
  124 #define NFS_NFSRVSTATS  1               /* struct: struct nfsrvstats */
  125 #define NFS_NFSPRIVPORT 2               /* int: prohibit nfs to resvports */
  126 
  127 #ifdef _KERNEL
  128 
  129 extern struct mtx nfsd_mtx;
  130 #define NFSD_LOCK_ASSERT()      mtx_assert(&nfsd_mtx, MA_OWNED)
  131 #define NFSD_UNLOCK_ASSERT()    mtx_assert(&nfsd_mtx, MA_NOTOWNED)
  132 #define NFSD_LOCK_DONTCARE()
  133 #define NFSD_LOCK()     mtx_lock(&nfsd_mtx)
  134 #define NFSD_UNLOCK()   mtx_unlock(&nfsd_mtx)
  135 
  136 #ifdef MALLOC_DECLARE
  137 MALLOC_DECLARE(M_NFSRVDESC);
  138 MALLOC_DECLARE(M_NFSD);
  139 #endif
  140 
  141 /* Forward declarations */
  142 struct nfssvc_sock;
  143 struct nfsrv_descript;
  144 struct uio;
  145 struct vattr;
  146 struct nameidata;
  147 
  148 extern struct callout nfsrv_callout;
  149 extern struct nfsrvstats nfsrvstats;
  150 
  151 extern int      nfsrv_ticks;
  152 extern int      nfsrvw_procrastinate;
  153 extern int      nfsrvw_procrastinate_v3;
  154 extern int      nfsrv_numnfsd;
  155 
  156 /* Various values converted to XDR form. */
  157 extern u_int32_t nfsrv_nfs_false, nfsrv_nfs_true, nfsrv_nfs_xdrneg1,
  158         nfsrv_nfs_prog;
  159 extern u_int32_t nfsrv_rpc_reply, nfsrv_rpc_msgdenied, nfsrv_rpc_mismatch,
  160         nfsrv_rpc_vers;
  161 extern u_int32_t nfsrv_rpc_auth_unix, nfsrv_rpc_msgaccepted, nfsrv_rpc_call,
  162         nfsrv_rpc_autherr;
  163 
  164 /* Procedure table data */
  165 extern const int        nfsrvv2_procid[NFS_NPROCS];
  166 extern const int        nfsrv_nfsv3_procid[NFS_NPROCS];
  167 extern int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
  168                     struct nfssvc_sock *slp, struct mbuf **mreqp);
  169 
  170 /*
  171  * A list of nfssvc_sock structures is maintained with all the sockets
  172  * that require service by the nfsd.
  173  */
  174 #ifndef NFS_WDELAYHASHSIZ
  175 #define NFS_WDELAYHASHSIZ 16    /* and with this */
  176 #endif
  177 #define NWDELAYHASH(sock, f) \
  178         (&(sock)->ns_wdelayhashtbl[(*((u_int32_t *)(f))) % NFS_WDELAYHASHSIZ])
  179 
  180 /*
  181  * This structure is used by the server for describing each request.
  182  */
  183 struct nfsrv_descript {
  184         struct mbuf             *nd_mrep;       /* Request mbuf list */
  185         struct mbuf             *nd_md;         /* Current dissect mbuf */
  186         struct mbuf             *nd_mreq;       /* Reply mbuf list */
  187         struct sockaddr         *nd_nam;        /* and socket addr */
  188         struct sockaddr         *nd_nam2;       /* return socket addr */
  189         caddr_t                 nd_dpos;        /* Current dissect pos */
  190         u_int32_t               nd_procnum;     /* RPC # */
  191         int                     nd_stable;      /* storage type */
  192         int                     nd_flag;        /* nd_flag */
  193         int                     nd_repstat;     /* Reply status */
  194         fhandle_t               nd_fh;          /* File handle */
  195         struct ucred            *nd_cr;         /* Credentials */
  196         int                     nd_credflavor;  /* Security flavor */
  197 };
  198 
  199 /* Bits for "nd_flag" */
  200 #define ND_NFSV3        0x08
  201 
  202 /*
  203  * Defines for WebNFS
  204  */
  205 
  206 #define WEBNFS_ESC_CHAR         '%'
  207 #define WEBNFS_SPECCHAR_START   0x80
  208 
  209 #define WEBNFS_NATIVE_CHAR      0x80
  210 /*
  211  * ..
  212  * Possibly more here in the future.
  213  */
  214 
  215 /*
  216  * Macro for converting escape characters in WebNFS pathnames.
  217  * Should really be in libkern.
  218  */
  219 
  220 #define HEXTOC(c) \
  221         ((c) >= 'a' ? ((c) - ('a' - 10)) : \
  222             ((c) >= 'A' ? ((c) - ('A' - 10)) : ((c) - '')))
  223 #define HEXSTRTOI(p) \
  224         ((HEXTOC(p[0]) << 4) + HEXTOC(p[1]))
  225 
  226 #ifdef NFS_DEBUG
  227 
  228 extern int nfs_debug;
  229 #define NFS_DEBUG_ASYNCIO       1 /* asynchronous i/o */
  230 #define NFS_DEBUG_WG            2 /* server write gathering */
  231 #define NFS_DEBUG_RC            4 /* server request caching */
  232 
  233 #define NFS_DPF(cat, args)                                      \
  234         do {                                                    \
  235                 if (nfs_debug & NFS_DEBUG_##cat) printf args;   \
  236         } while (0)
  237 
  238 #else
  239 
  240 #define NFS_DPF(cat, args)
  241 
  242 #endif
  243 
  244 /*
  245  * The following flags can be passed to nfsrv_fhtovp() function.
  246  */
  247 /* Leave file system busy on success. */
  248 #define NFSRV_FLAG_BUSY         0x01
  249 
  250 struct mbuf *nfs_rephead(int, struct nfsrv_descript *, int, struct mbuf **,
  251             caddr_t *);
  252 void    nfsm_srvfattr(struct nfsrv_descript *, struct vattr *,
  253             struct nfs_fattr *);
  254 void    nfsm_srvwcc(struct nfsrv_descript *, int, struct vattr *, int,
  255             struct vattr *, struct mbuf **, char **);
  256 void    nfsm_srvpostopattr(struct nfsrv_descript *, int, struct vattr *,
  257             struct mbuf **, char **);
  258 int     nfs_namei(struct nameidata *, struct nfsrv_descript *, fhandle_t *,
  259             int, struct nfssvc_sock *, struct sockaddr *, struct mbuf **,
  260             caddr_t *, struct vnode **, int, struct vattr *, int *, int);
  261 void    nfsm_adj(struct mbuf *, int, int);
  262 int     nfsm_mbuftouio(struct mbuf **, struct uio *, int, caddr_t *);
  263 void    nfsrv_init(int);
  264 int     nfsrv_errmap(struct nfsrv_descript *, int);
  265 void    nfsrvw_sort(gid_t *, int);
  266 
  267 int     nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  268             struct mbuf **mrq);
  269 int     nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  270             struct mbuf **mrq);
  271 int     nfsrv_create(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  272             struct mbuf **mrq);
  273 int     nfsrv_fhtovp(fhandle_t *, int, struct vnode **,
  274             struct nfsrv_descript *, struct nfssvc_sock *, struct sockaddr *,
  275             int *);
  276 int     nfsrv_setpublicfs(struct mount *, struct netexport *,
  277             struct export_args *);
  278 int     nfs_ispublicfh(fhandle_t *);
  279 int     nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  280             struct mbuf **mrq);
  281 int     nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  282             struct mbuf **mrq);
  283 int     nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  284             struct mbuf **mrq);
  285 int     nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  286             struct mbuf **mrq);
  287 int     nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  288             struct mbuf **mrq);
  289 int     nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  290             struct mbuf **mrq);
  291 int     nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  292             struct mbuf **mrq);
  293 int     nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  294             struct mbuf **mrq);
  295 int     nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  296             struct mbuf **mrq);
  297 int     nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  298             struct mbuf **mrq);
  299 int     nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  300             struct mbuf **mrq);
  301 int     nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  302             struct mbuf **mrq);
  303 int     nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  304             struct mbuf **mrq);
  305 int     nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  306             struct mbuf **mrq);
  307 int     nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  308             struct mbuf **mrq);
  309 int     nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  310             struct mbuf **mrq);
  311 int     nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  312             struct mbuf **mrq);
  313 int     nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  314             struct mbuf **mrq);
  315 int     nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  316             struct mbuf **mrq);
  317 int     nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
  318             struct mbuf **mrq);
  319 /*
  320  * #ifdef _SYS_SYSPROTO_H_ so that it is only defined when sysproto.h
  321  * has been included, so that "struct nfssvc_args" is defined.
  322  */
  323 #ifdef _SYS_SYSPROTO_H_
  324 int nfssvc_nfsserver(struct thread *, struct nfssvc_args *);
  325 #endif
  326 #endif  /* _KERNEL */
  327 
  328 #endif

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