1 /* $NetBSD: nfs_nfssvc.c,v 1.2 2016/12/13 22:41:46 pgoyette Exp $ */
2 /*-
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Rick Macklem at The University of Guelph.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 */
34
35 #include <sys/cdefs.h>
36 /* __FBSDID("FreeBSD: head/sys/nfs/nfs_nfssvc.c 298788 2016-04-29 16:07:25Z pfg "); */
37 __RCSID("$NetBSD: nfs_nfssvc.c,v 1.2 2016/12/13 22:41:46 pgoyette Exp $");
38
39 #ifdef _KERNEL_OPT
40 #include "opt_newnfs.h"
41 #endif
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/sysproto.h>
46 #include <sys/kernel.h>
47 #include <sys/sysctl.h>
48 #include <sys/priv.h>
49 #include <sys/proc.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/module.h>
53 #include <sys/sysent.h>
54 #include <sys/syscall.h>
55
56 #include <security/audit/audit.h>
57
58 #include <fs/nfs/common/nfssvc.h>
59
60 static int nfssvc_offset = SYS_nfssvc;
61 static struct sysent nfssvc_prev_sysent;
62 MAKE_SYSENT(nfssvc);
63
64 /*
65 * This tiny module simply handles the nfssvc() system call. The other
66 * nfs modules that use the system call register themselves by setting
67 * the nfsd_call_xxx function pointers non-NULL.
68 */
69
70 int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL;
71 int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL;
72 int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL;
73 int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL;
74
75 /*
76 * Nfs server pseudo system call for the nfsd's
77 */
78 int
sys_nfssvc(struct thread * td,struct nfssvc_args * uap)79 sys_nfssvc(struct thread *td, struct nfssvc_args *uap)
80 {
81 int error;
82
83 KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
84
85 AUDIT_ARG_CMD(uap->flag);
86
87 /* Allow anyone to get the stats. */
88 if ((uap->flag & ~NFSSVC_GETSTATS) != 0) {
89 error = priv_check(td, PRIV_NFS_DAEMON);
90 if (error != 0)
91 return (error);
92 }
93 error = EINVAL;
94 if ((uap->flag & (NFSSVC_ADDSOCK | NFSSVC_OLDNFSD | NFSSVC_NFSD)) &&
95 nfsd_call_nfsserver != NULL)
96 error = (*nfsd_call_nfsserver)(td, uap);
97 else if ((uap->flag & (NFSSVC_CBADDSOCK | NFSSVC_NFSCBD |
98 NFSSVC_DUMPMNTOPTS)) && nfsd_call_nfscl != NULL)
99 error = (*nfsd_call_nfscl)(td, uap);
100 else if ((uap->flag & (NFSSVC_IDNAME | NFSSVC_GETSTATS |
101 NFSSVC_GSSDADDPORT | NFSSVC_GSSDADDFIRST | NFSSVC_GSSDDELETEALL |
102 NFSSVC_NFSUSERDPORT | NFSSVC_NFSUSERDDELPORT)) &&
103 nfsd_call_nfscommon != NULL)
104 error = (*nfsd_call_nfscommon)(td, uap);
105 else if ((uap->flag & (NFSSVC_NFSDNFSD | NFSSVC_NFSDADDSOCK |
106 NFSSVC_PUBLICFH | NFSSVC_V4ROOTEXPORT | NFSSVC_NOPUBLICFH |
107 NFSSVC_STABLERESTART | NFSSVC_ADMINREVOKE |
108 NFSSVC_DUMPCLIENTS | NFSSVC_DUMPLOCKS | NFSSVC_BACKUPSTABLE |
109 NFSSVC_SUSPENDNFSD | NFSSVC_RESUMENFSD)) &&
110 nfsd_call_nfsd != NULL)
111 error = (*nfsd_call_nfsd)(td, uap);
112 if (error == EINTR || error == ERESTART)
113 error = 0;
114 return (error);
115 }
116
117 /*
118 * Called once to initialize data structures...
119 */
120 static int
nfssvc_modevent(module_t mod,int type,void * data)121 nfssvc_modevent(module_t mod, int type, void *data)
122 {
123 static int registered;
124 int error = 0;
125
126 switch (type) {
127 case MOD_LOAD:
128 error = syscall_register(&nfssvc_offset, &nfssvc_sysent,
129 &nfssvc_prev_sysent, SY_THR_STATIC_KLD);
130 if (error)
131 break;
132 registered = 1;
133 break;
134
135 case MOD_UNLOAD:
136 if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL
137 || nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) {
138 error = EBUSY;
139 break;
140 }
141 if (registered)
142 syscall_deregister(&nfssvc_offset, &nfssvc_prev_sysent);
143 registered = 0;
144 break;
145 default:
146 error = EOPNOTSUPP;
147 break;
148 }
149 return error;
150 }
151 static moduledata_t nfssvc_mod = {
152 "nfssvc",
153 nfssvc_modevent,
154 NULL,
155 };
156 DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY);
157
158 /* So that loader and kldload(2) can find us, wherever we are.. */
159 MODULE_VERSION(nfssvc, 1);
160
161