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 * 3. 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("$FreeBSD$"); 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 57 static int nfssvc_offset = SYS_nfssvc; 58 static struct sysent nfssvc_prev_sysent; 59 MAKE_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 67 int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *) = NULL; 68 int (*nfsd_call_nfscommon)(struct thread *, struct nfssvc_args *) = NULL; 69 int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *) = NULL; 70 int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *) = NULL; 71 72 /* 73 * Nfs server pseudo system call for the nfsd's 74 */ 75 int 76 sys_nfssvc(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 /* Allow anyone to get the stats. */ 85 if ((uap->flag & ~NFSSVC_GETSTATS) != 0) { 86 error = priv_check(td, PRIV_NFS_DAEMON); 87 if (error != 0) 88 return (error); 89 } 90 error = EINVAL; 91 if ((uap->flag & (NFSSVC_ADDSOCK | NFSSVC_OLDNFSD | NFSSVC_NFSD)) && 92 nfsd_call_nfsserver != NULL) 93 error = (*nfsd_call_nfsserver)(td, uap); 94 else if ((uap->flag & (NFSSVC_CBADDSOCK | NFSSVC_NFSCBD | 95 NFSSVC_DUMPMNTOPTS)) && nfsd_call_nfscl != NULL) 96 error = (*nfsd_call_nfscl)(td, uap); 97 else if ((uap->flag & (NFSSVC_IDNAME | NFSSVC_GETSTATS | 98 NFSSVC_GSSDADDPORT | NFSSVC_GSSDADDFIRST | NFSSVC_GSSDDELETEALL | 99 NFSSVC_NFSUSERDPORT | NFSSVC_NFSUSERDDELPORT)) && 100 nfsd_call_nfscommon != NULL) 101 error = (*nfsd_call_nfscommon)(td, uap); 102 else if ((uap->flag & (NFSSVC_NFSDNFSD | NFSSVC_NFSDADDSOCK | 103 NFSSVC_PUBLICFH | NFSSVC_V4ROOTEXPORT | NFSSVC_NOPUBLICFH | 104 NFSSVC_STABLERESTART | NFSSVC_ADMINREVOKE | 105 NFSSVC_DUMPCLIENTS | NFSSVC_DUMPLOCKS | NFSSVC_BACKUPSTABLE | 106 NFSSVC_SUSPENDNFSD | NFSSVC_RESUMENFSD)) && 107 nfsd_call_nfsd != NULL) 108 error = (*nfsd_call_nfsd)(td, uap); 109 if (error == EINTR || error == ERESTART) 110 error = 0; 111 return (error); 112 } 113 114 /* 115 * Called once to initialize data structures... 116 */ 117 static int 118 nfssvc_modevent(module_t mod, int type, void *data) 119 { 120 static int registered; 121 int error = 0; 122 123 switch (type) { 124 case MOD_LOAD: 125 error = syscall_register(&nfssvc_offset, &nfssvc_sysent, 126 &nfssvc_prev_sysent, SY_THR_STATIC_KLD); 127 if (error) 128 break; 129 registered = 1; 130 break; 131 132 case MOD_UNLOAD: 133 if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL 134 || nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) { 135 error = EBUSY; 136 break; 137 } 138 if (registered) 139 syscall_deregister(&nfssvc_offset, &nfssvc_prev_sysent); 140 registered = 0; 141 break; 142 default: 143 error = EOPNOTSUPP; 144 break; 145 } 146 return error; 147 } 148 static moduledata_t nfssvc_mod = { 149 "nfssvc", 150 nfssvc_modevent, 151 NULL, 152 }; 153 DECLARE_MODULE(nfssvc, nfssvc_mod, SI_SUB_VFS, SI_ORDER_ANY); 154 155 /* So that loader and kldload(2) can find us, wherever we are.. */ 156 MODULE_VERSION(nfssvc, 1); 157 158