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 __FBSDID("$FreeBSD$"); 38 39 #include "opt_nfs.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/sysproto.h> 44 #include <sys/kernel.h> 45 #include <sys/sysctl.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 #include <sys/module.h> 51 #include <sys/sysent.h> 52 #include <sys/syscall.h> 53 #include <sys/sysproto.h> 54 55 #include <security/audit/audit.h> 56 57 #include <nfs/nfssvc.h> 58 59 static struct syscall_helper_data nfssvc_syscalls[] = { 60 SYSCALL_INIT_HELPER(nfssvc), 61 SYSCALL_INIT_LAST 62 }; 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 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 | NFSSVC_NEWSTRUCT)) != 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 | NFSSVC_FORCEDISM)) && 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 | NFSSVC_PNFSDS)) && 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 121 nfssvc_modevent(module_t mod, int type, void *data) 122 { 123 int error = 0; 124 125 switch (type) { 126 case MOD_LOAD: 127 error = syscall_helper_register(nfssvc_syscalls, 128 SY_THR_STATIC_KLD); 129 break; 130 131 case MOD_UNLOAD: 132 if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL 133 || nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) { 134 error = EBUSY; 135 break; 136 } 137 syscall_helper_unregister(nfssvc_syscalls); 138 break; 139 default: 140 error = EOPNOTSUPP; 141 break; 142 } 143 return error; 144 } 145 static moduledata_t nfssvc_mod = { 146 "nfssvc", 147 nfssvc_modevent, 148 NULL, 149 }; 150 DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY); 151 152 /* So that loader and kldload(2) can find us, wherever we are.. */ 153 MODULE_VERSION(nfssvc, 1); 154