FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_nfssvc.c

     /*-
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Rick Macklem at The University of Guelph.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.2/sys/nfs/nfs_nfssvc.c 331722 2018-03-29 02:50:57Z eadler $");
    
    #include "opt_nfs.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/kernel.h>
    #include <sys/sysctl.h>
    #include <sys/priv.h>
    #include <sys/proc.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/module.h>
    #include <sys/sysent.h>
    #include <sys/syscall.h>
    #include <sys/sysproto.h>
    
    #include <security/audit/audit.h>
    
    #include <nfs/nfssvc.h>
    
    static int nfssvc_offset = SYS_nfssvc;
    static struct sysent nfssvc_prev_sysent;
    MAKE_SYSENT(nfssvc);
    
    /*
     * This tiny module simply handles the nfssvc() system call. The other
     * nfs modules that use the system call register themselves by setting
     * the nfsd_call_xxx function pointers non-NULL.
     */
    
    int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL;
    int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL;
    int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL;
    int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL;
    
    /*
     * Nfs server pseudo system call for the nfsd's
     */
    int
    sys_nfssvc(struct thread *td, struct nfssvc_args *uap)
    {
            int error;
    
            KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
    
            AUDIT_ARG_CMD(uap->flag);
    
            /* Allow anyone to get the stats. */
            if ((uap->flag & ~NFSSVC_GETSTATS) != 0) {
                    error = priv_check(td, PRIV_NFS_DAEMON);
                    if (error != 0)
                            return (error);
            }
            error = EINVAL;
            if ((uap->flag & (NFSSVC_ADDSOCK | NFSSVC_OLDNFSD | NFSSVC_NFSD)) &&
                nfsd_call_nfsserver != NULL)
                    error = (*nfsd_call_nfsserver)(td, uap);
            else if ((uap->flag & (NFSSVC_CBADDSOCK | NFSSVC_NFSCBD |
                NFSSVC_DUMPMNTOPTS | NFSSVC_FORCEDISM)) && nfsd_call_nfscl != NULL)
                    error = (*nfsd_call_nfscl)(td, uap);
            else if ((uap->flag & (NFSSVC_IDNAME | NFSSVC_GETSTATS |
                NFSSVC_GSSDADDPORT | NFSSVC_GSSDADDFIRST | NFSSVC_GSSDDELETEALL |
                NFSSVC_NFSUSERDPORT | NFSSVC_NFSUSERDDELPORT)) &&
               nfsd_call_nfscommon != NULL)
                   error = (*nfsd_call_nfscommon)(td, uap);
           else if ((uap->flag & (NFSSVC_NFSDNFSD | NFSSVC_NFSDADDSOCK |
               NFSSVC_PUBLICFH | NFSSVC_V4ROOTEXPORT | NFSSVC_NOPUBLICFH |
               NFSSVC_STABLERESTART | NFSSVC_ADMINREVOKE |
               NFSSVC_DUMPCLIENTS | NFSSVC_DUMPLOCKS | NFSSVC_BACKUPSTABLE |
               NFSSVC_SUSPENDNFSD | NFSSVC_RESUMENFSD)) &&
               nfsd_call_nfsd != NULL)
                   error = (*nfsd_call_nfsd)(td, uap);
           if (error == EINTR || error == ERESTART)
                   error = 0;
           return (error);
   }
   
   /*
    * Called once to initialize data structures...
    */
   static int
   nfssvc_modevent(module_t mod, int type, void *data)
   {
           static int registered;
           int error = 0;
   
           switch (type) {
           case MOD_LOAD:
                   error = syscall_register(&nfssvc_offset, &nfssvc_sysent,
                       &nfssvc_prev_sysent, SY_THR_STATIC_KLD);
                   if (error)
                           break;
                   registered = 1;
                   break;
   
           case MOD_UNLOAD:
                   if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL
                       || nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) {
                           error = EBUSY;
                           break;
                   }
                   if (registered)
                           syscall_deregister(&nfssvc_offset, &nfssvc_prev_sysent);
                   registered = 0;
                   break;
           default:
                   error = EOPNOTSUPP;
                   break;
           }
           return error;
   }
   static moduledata_t nfssvc_mod = {
           "nfssvc",
           nfssvc_modevent,
           NULL,
   };
   DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY);
   
   /* So that loader and kldload(2) can find us, wherever we are.. */
   MODULE_VERSION(nfssvc, 1);
   

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