/*      $NetBSD: nfs_nfssvc.c,v 1.2 2016/12/13 22:41:46 pgoyette Exp $  */
/*-
* 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: head/sys/nfs/nfs_nfssvc.c 298788 2016-04-29 16:07:25Z pfg "); */
__RCSID("$NetBSD: nfs_nfssvc.c,v 1.2 2016/12/13 22:41:46 pgoyette Exp $");

#ifdef _KERNEL_OPT
#include "opt_newnfs.h"
#endif

#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 <security/audit/audit.h>

#include <fs/nfs/common/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)) && 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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