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e015b1ab0a
The kernel tracks syscall users so that modules can safely unregister them. But if the module is not unloadable or was compiled into the kernel, there is no need to do this. Achieve this by adding SY_THR_STATIC_KLD macro which expands to SY_THR_STATIC during kernel build and 0 otherwise. Reviewed by: kib (previous version) MFC after: 2 weeks
158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_nfs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/module.h>
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#include <sys/sysent.h>
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#include <sys/syscall.h>
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#include <sys/sysproto.h>
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#include <security/audit/audit.h>
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#include <nfs/nfssvc.h>
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static int nfssvc_offset = SYS_nfssvc;
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static struct sysent nfssvc_prev_sysent;
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MAKE_SYSENT(nfssvc);
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/*
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* This tiny module simply handles the nfssvc() system call. The other
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* nfs modules that use the system call register themselves by setting
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* the nfsd_call_xxx function pointers non-NULL.
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*/
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int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL;
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int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL;
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int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL;
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int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL;
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/*
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* Nfs server psuedo system call for the nfsd's
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*/
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int
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sys_nfssvc(struct thread *td, struct nfssvc_args *uap)
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{
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int error;
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KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
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AUDIT_ARG_CMD(uap->flag);
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/* Allow anyone to get the stats. */
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if ((uap->flag & ~NFSSVC_GETSTATS) != 0) {
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error = priv_check(td, PRIV_NFS_DAEMON);
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if (error != 0)
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return (error);
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}
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error = EINVAL;
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if ((uap->flag & (NFSSVC_ADDSOCK | NFSSVC_OLDNFSD | NFSSVC_NFSD)) &&
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nfsd_call_nfsserver != NULL)
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error = (*nfsd_call_nfsserver)(td, uap);
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else if ((uap->flag & (NFSSVC_CBADDSOCK | NFSSVC_NFSCBD |
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NFSSVC_DUMPMNTOPTS)) && nfsd_call_nfscl != NULL)
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error = (*nfsd_call_nfscl)(td, uap);
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else if ((uap->flag & (NFSSVC_IDNAME | NFSSVC_GETSTATS |
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NFSSVC_GSSDADDPORT | NFSSVC_GSSDADDFIRST | NFSSVC_GSSDDELETEALL |
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NFSSVC_NFSUSERDPORT | NFSSVC_NFSUSERDDELPORT)) &&
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nfsd_call_nfscommon != NULL)
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error = (*nfsd_call_nfscommon)(td, uap);
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else if ((uap->flag & (NFSSVC_NFSDNFSD | NFSSVC_NFSDADDSOCK |
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NFSSVC_PUBLICFH | NFSSVC_V4ROOTEXPORT | NFSSVC_NOPUBLICFH |
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NFSSVC_STABLERESTART | NFSSVC_ADMINREVOKE |
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NFSSVC_DUMPCLIENTS | NFSSVC_DUMPLOCKS | NFSSVC_BACKUPSTABLE |
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NFSSVC_SUSPENDNFSD | NFSSVC_RESUMENFSD)) &&
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nfsd_call_nfsd != NULL)
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error = (*nfsd_call_nfsd)(td, uap);
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if (error == EINTR || error == ERESTART)
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error = 0;
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return (error);
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}
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/*
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* Called once to initialize data structures...
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*/
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static int
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nfssvc_modevent(module_t mod, int type, void *data)
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{
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static int registered;
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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error = syscall_register(&nfssvc_offset, &nfssvc_sysent,
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&nfssvc_prev_sysent, SY_THR_STATIC_KLD);
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if (error)
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break;
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registered = 1;
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break;
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case MOD_UNLOAD:
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if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL
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|| nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) {
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error = EBUSY;
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break;
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}
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if (registered)
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syscall_deregister(&nfssvc_offset, &nfssvc_prev_sysent);
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registered = 0;
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return error;
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}
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static moduledata_t nfssvc_mod = {
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"nfssvc",
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nfssvc_modevent,
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NULL,
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};
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DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY);
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/* So that loader and kldload(2) can find us, wherever we are.. */
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MODULE_VERSION(nfssvc, 1);
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