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 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 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