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
57 static 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
68 int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL;
69 int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL;
70 int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL;
71 int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL;
72
73 /*
74 * Nfs server pseudo system call for the nfsd's
75 */
76 int
sys_nfssvc(struct thread * td,struct nfssvc_args * uap)77 sys_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 */
118 static int
nfssvc_modevent(module_t mod,int type,void * data)119 nfssvc_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 }
143 static moduledata_t nfssvc_mod = {
144 "nfssvc",
145 nfssvc_modevent,
146 NULL,
147 };
148 DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY);
149
150 /* So that loader and kldload(2) can find us, wherever we are.. */
151 MODULE_VERSION(nfssvc, 1);
152