1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
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 */
35
36#include <sys/cdefs.h>
37#include "opt_nfs.h"
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/sysproto.h>
42#include <sys/kernel.h>
43#include <sys/sysctl.h>
44#include <sys/priv.h>
45#include <sys/proc.h>
46#include <sys/lock.h>
47#include <sys/mutex.h>
48#include <sys/module.h>
49#include <sys/sysent.h>
50#include <sys/syscall.h>
51#include <sys/sysproto.h>
52
53#include <security/audit/audit.h>
54
55#include <nfs/nfssvc.h>
56
57static struct syscall_helper_data nfssvc_syscalls[] = {
58	SYSCALL_INIT_HELPER(nfssvc),
59	SYSCALL_INIT_LAST
60};
61
62/*
63 * This tiny module simply handles the nfssvc() system call. The other
64 * nfs modules that use the system call register themselves by setting
65 * the nfsd_call_xxx function pointers non-NULL.
66 */
67
68int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL;
69int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL;
70int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL;
71int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL;
72
73/*
74 * Nfs server pseudo system call for the nfsd's
75 */
76int
77sys_nfssvc(struct thread *td, struct nfssvc_args *uap)
78{
79	int error;
80
81	KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
82
83	AUDIT_ARG_CMD(uap->flag);
84
85	/* Allow anyone to get the stats. */
86	if ((uap->flag & ~(NFSSVC_GETSTATS | NFSSVC_NEWSTRUCT)) != 0) {
87		error = priv_check(td, PRIV_NFS_DAEMON);
88		if (error != 0)
89			return (error);
90	}
91	error = EINVAL;
92	if ((uap->flag & (NFSSVC_ADDSOCK | NFSSVC_OLDNFSD | NFSSVC_NFSD)) &&
93	    nfsd_call_nfsserver != NULL)
94		error = (*nfsd_call_nfsserver)(td, uap);
95	else if ((uap->flag & (NFSSVC_CBADDSOCK | NFSSVC_NFSCBD |
96	    NFSSVC_DUMPMNTOPTS | NFSSVC_FORCEDISM)) && nfsd_call_nfscl != NULL)
97		error = (*nfsd_call_nfscl)(td, uap);
98	else if ((uap->flag & (NFSSVC_IDNAME | NFSSVC_GETSTATS |
99	    NFSSVC_GSSDADDPORT | NFSSVC_GSSDADDFIRST | NFSSVC_GSSDDELETEALL |
100	    NFSSVC_NFSUSERDPORT | NFSSVC_NFSUSERDDELPORT)) &&
101	    nfsd_call_nfscommon != NULL)
102		error = (*nfsd_call_nfscommon)(td, uap);
103	else if ((uap->flag & (NFSSVC_NFSDNFSD | NFSSVC_NFSDADDSOCK |
104	    NFSSVC_PUBLICFH | NFSSVC_V4ROOTEXPORT | NFSSVC_NOPUBLICFH |
105	    NFSSVC_STABLERESTART | NFSSVC_ADMINREVOKE |
106	    NFSSVC_DUMPCLIENTS | NFSSVC_DUMPLOCKS | NFSSVC_BACKUPSTABLE |
107	    NFSSVC_SUSPENDNFSD | NFSSVC_RESUMENFSD | NFSSVC_PNFSDS)) &&
108	    nfsd_call_nfsd != NULL)
109		error = (*nfsd_call_nfsd)(td, uap);
110	if (error == EINTR || error == ERESTART)
111		error = 0;
112	return (error);
113}
114
115/*
116 * Called once to initialize data structures...
117 */
118static int
119nfssvc_modevent(module_t mod, int type, void *data)
120{
121	int error = 0;
122
123	switch (type) {
124	case MOD_LOAD:
125		error = syscall_helper_register(nfssvc_syscalls,
126		    SY_THR_STATIC_KLD);
127		break;
128
129	case MOD_UNLOAD:
130		if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL
131		    || nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) {
132			error = EBUSY;
133			break;
134		}
135		syscall_helper_unregister(nfssvc_syscalls);
136		break;
137	default:
138		error = EOPNOTSUPP;
139		break;
140	}
141	return error;
142}
143static moduledata_t nfssvc_mod = {
144	"nfssvc",
145	nfssvc_modevent,
146	NULL,
147};
148DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY);
149
150/* So that loader and kldload(2) can find us, wherever we are.. */
151MODULE_VERSION(nfssvc, 1);
152