nfs_nfssvc.c revision 195104 
1/*-
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/sys/nfs/nfs_nfssvc.c 195104 2009-06-27 13:58:44Z rwatson $");
36
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 int nfssvc_offset = SYS_nfssvc;
58static struct sysent nfssvc_prev_sysent;
59MAKE_SYSENT(nfssvc);
60
61/*
62 * This tiny module simply handles the nfssvc() system call. The other
63 * nfs modules that use the system call register themselves by setting
64 * the nfsd_call_xxx function pointers non-NULL.
65 */
66
67int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL;
68int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL;
69int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL;
70int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL;
71
72/*
73 * Nfs server psuedo system call for the nfsd's
74 */
75int
76nfssvc(struct thread *td, struct nfssvc_args *uap)
77{
78	int error;
79
80	KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
81
82	AUDIT_ARG_CMD(uap->flag);
83
84	error = priv_check(td, PRIV_NFS_DAEMON);
85	if (error)
86		return (error);
87	error = EINVAL;
88	if ((uap->flag & (NFSSVC_ADDSOCK | NFSSVC_OLDNFSD | NFSSVC_NFSD)) &&
89	    nfsd_call_nfsserver != NULL)
90		error = (*nfsd_call_nfsserver)(td, uap);
91	else if ((uap->flag & (NFSSVC_CBADDSOCK | NFSSVC_NFSCBD)) &&
92	    nfsd_call_nfscl != NULL)
93		error = (*nfsd_call_nfscl)(td, uap);
94	else if ((uap->flag & (NFSSVC_IDNAME | NFSSVC_GETSTATS |
95	    NFSSVC_GSSDADDPORT | NFSSVC_GSSDADDFIRST | NFSSVC_GSSDDELETEALL |
96	    NFSSVC_NFSUSERDPORT | NFSSVC_NFSUSERDDELPORT)) &&
97	    nfsd_call_nfscommon != NULL)
98		error = (*nfsd_call_nfscommon)(td, uap);
99	else if ((uap->flag & (NFSSVC_NFSDNFSD | NFSSVC_NFSDADDSOCK |
100	    NFSSVC_PUBLICFH | NFSSVC_V4ROOTEXPORT | NFSSVC_NOPUBLICFH |
101	    NFSSVC_STABLERESTART | NFSSVC_ADMINREVOKE |
102	    NFSSVC_DUMPCLIENTS | NFSSVC_DUMPLOCKS)) &&
103	    nfsd_call_nfsd != NULL)
104		error = (*nfsd_call_nfsd)(td, uap);
105	if (error == EINTR || error == ERESTART)
106		error = 0;
107	return (error);
108}
109
110/*
111 * Called once to initialize data structures...
112 */
113static int
114nfssvc_modevent(module_t mod, int type, void *data)
115{
116	static int registered;
117	int error = 0;
118
119	switch (type) {
120	case MOD_LOAD:
121		error = syscall_register(&nfssvc_offset, &nfssvc_sysent,
122		    &nfssvc_prev_sysent);
123		if (error)
124			break;
125		registered = 1;
126		break;
127
128	case MOD_UNLOAD:
129		if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL
130		    || nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) {
131			error = EBUSY;
132			break;
133		}
134		if (registered)
135			syscall_deregister(&nfssvc_offset, &nfssvc_prev_sysent);
136		registered = 0;
137		break;
138	default:
139		error = EOPNOTSUPP;
140		break;
141	}
142	return error;
143}
144static moduledata_t nfssvc_mod = {
145	"nfssvc",
146	nfssvc_modevent,
147	NULL,
148};
149DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY);
150
151/* So that loader and kldload(2) can find us, wherever we are.. */
152MODULE_VERSION(nfssvc, 1);
153
154