1 /* $NetBSD: linux_sysctl.c,v 1.10 2003/08/07 16:30:45 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 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 * Mike Karels at Berkeley Software Design, Inc. 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 * @(#)kern_sysctl.c 8.9 (Berkeley) 5/20/95 35 */ 36 37 /* 38 * sysctl system call. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: linux_sysctl.c,v 1.10 2003/08/07 16:30:45 agc Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/mount.h> 49 #include <sys/sysctl.h> 50 #include <sys/sa.h> 51 #include <sys/syscallargs.h> 52 53 #include <compat/linux/common/linux_types.h> 54 #include <compat/linux/common/linux_signal.h> 55 56 #include <compat/linux/linux_syscallargs.h> 57 #include <compat/linux/common/linux_sysctl.h> 58 #include <compat/linux/common/linux_exec.h> 59 60 int linux_kern_sysctl(int *, u_int, void *, size_t *, void *, size_t, 61 struct proc *); 62 int linux_vm_sysctl(int *, u_int, void *, size_t *, void *, size_t, 63 struct proc *); 64 int linux_net_sysctl(int *, u_int, void *, size_t *, void *, size_t, 65 struct proc *); 66 int linux_proc_sysctl(int *, u_int, void *, size_t *, void *, size_t, 67 struct proc *); 68 int linux_fs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 69 struct proc *); 70 #ifdef DEBUG 71 int linux_debug_sysctl(int *, u_int, void *, size_t *, void *, size_t, 72 struct proc *); 73 #endif 74 int linux_dev_sysctl(int *, u_int, void *, size_t *, void *, size_t, 75 struct proc *); 76 int linux_bus_sysctl(int *, u_int, void *, size_t *, void *, size_t, 77 struct proc *); 78 79 int 80 linux_sys___sysctl(struct lwp *l, void *v, register_t *retval) 81 { 82 struct linux_sys___sysctl_args /* { 83 syscallarg(struct linux___sysctl *) lsp; 84 } */ *uap = v; 85 struct proc *p = l->l_proc; 86 struct linux___sysctl ls; 87 int error; 88 size_t savelen = 0, oldlen = 0; 89 sysctlfn *fn; 90 int name[CTL_MAXNAME]; 91 size_t *oldlenp; 92 93 94 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof ls))) 95 return error; 96 /* 97 * all top-level sysctl names are non-terminal 98 */ 99 if (ls.nlen > CTL_MAXNAME || ls.nlen < 2) 100 return (EINVAL); 101 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 102 if (error) 103 return (error); 104 105 /* 106 * For all but CTL_PROC, must be root to change a value. 107 * For CTL_PROC, must be root, or owner of the proc (and not suid), 108 * this is checked in proc_sysctl() (once we know the targer proc). 109 */ 110 if (ls.newval != NULL && name[0] != CTL_PROC && 111 (error = suser(p->p_ucred, &p->p_acflag))) 112 return error; 113 114 switch (name[0]) { 115 case LINUX_CTL_KERN: 116 fn = linux_kern_sysctl; 117 break; 118 case LINUX_CTL_VM: 119 fn = linux_vm_sysctl; 120 break; 121 case LINUX_CTL_NET: 122 fn = linux_net_sysctl; 123 break; 124 case LINUX_CTL_PROC: 125 fn = linux_proc_sysctl; 126 break; 127 case LINUX_CTL_FS: 128 fn = linux_fs_sysctl; 129 break; 130 #ifdef DEBUG 131 case LINUX_CTL_DEBUG: 132 fn = linux_debug_sysctl; 133 break; 134 #endif 135 case LINUX_CTL_DEV: 136 fn = linux_dev_sysctl; 137 break; 138 case LINUX_CTL_BUS: 139 fn = linux_bus_sysctl; 140 break; 141 default: 142 return (EOPNOTSUPP); 143 } 144 145 /* 146 * XXX Hey, we wire `oldval', but what about `newval'? 147 */ 148 oldlenp = ls.oldlenp; 149 if (oldlenp) { 150 if ((error = copyin(oldlenp, &oldlen, sizeof(oldlen)))) 151 return (error); 152 oldlenp = &oldlen; 153 } 154 if (ls.oldval != NULL) { 155 error = uvm_vslock(p, ls.oldval, oldlen, 156 VM_PROT_READ|VM_PROT_WRITE); 157 savelen = oldlen; 158 } 159 error = (*fn)(name + 1, ls.nlen - 1, ls.oldval, oldlenp, ls.newval, 160 ls.newlen, p); 161 if (ls.oldval != NULL) 162 uvm_vsunlock(p, ls.oldval, savelen); 163 if (error) 164 return (error); 165 if (ls.oldlenp) 166 error = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 167 return (error); 168 } 169 170 char linux_sysname[128] = "Linux"; 171 #if defined(__i386__) || defined(__powerpc__) 172 char linux_release[128] = "2.4.18"; 173 char linux_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 174 #else 175 char linux_release[128] = "2.0.38"; 176 char linux_version[128] = "#0 Sun Nov 11 11:11:11 MET 2000"; 177 #endif 178 179 /* 180 * kernel related system variables. 181 */ 182 int 183 linux_kern_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 184 void *newp, size_t newlen, struct proc *p) 185 { 186 /* 187 * Note that we allow writing into this, so that userland 188 * programs can setup things as they see fit. This is suboptimal. 189 */ 190 switch (name[0]) { 191 case LINUX_KERN_OSTYPE: 192 return sysctl_string(oldp, oldlenp, newp, newlen, 193 linux_sysname, sizeof(linux_sysname)); 194 case LINUX_KERN_OSRELEASE: 195 return sysctl_string(oldp, oldlenp, newp, newlen, 196 linux_release, sizeof(linux_release)); 197 case LINUX_KERN_VERSION: 198 return sysctl_string(oldp, oldlenp, newp, newlen, 199 linux_version, sizeof(linux_version)); 200 default: 201 return EOPNOTSUPP; 202 } 203 } 204 205 /* 206 * kernel related system variables. 207 */ 208 int 209 linux_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 210 void *newp, size_t newlen, struct proc *p) 211 { 212 if (nlen != 2 || name[0] != EMUL_LINUX_KERN) 213 return EOPNOTSUPP; 214 215 /* 216 * Note that we allow writing into this, so that userland 217 * programs can setup things as they see fit. This is suboptimal. 218 */ 219 switch (name[1]) { 220 case EMUL_LINUX_KERN_OSTYPE: 221 return sysctl_string(oldp, oldlenp, newp, newlen, 222 linux_sysname, sizeof(linux_sysname)); 223 case EMUL_LINUX_KERN_OSRELEASE: 224 return sysctl_string(oldp, oldlenp, newp, newlen, 225 linux_release, sizeof(linux_release)); 226 case EMUL_LINUX_KERN_VERSION: 227 return sysctl_string(oldp, oldlenp, newp, newlen, 228 linux_version, sizeof(linux_version)); 229 default: 230 return EOPNOTSUPP; 231 } 232 } 233 234 /* 235 * hardware related system variables. 236 */ 237 int 238 linux_vm_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 239 void *newp, size_t newlen, struct proc *p) 240 { 241 return (EOPNOTSUPP); 242 } 243 244 int 245 linux_net_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 246 void *newp, size_t newlen, struct proc *p) 247 { 248 return (EOPNOTSUPP); 249 } 250 251 int 252 linux_proc_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 253 void *newp, size_t newlen, struct proc *p) 254 { 255 return (EOPNOTSUPP); 256 } 257 258 int 259 linux_fs_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 260 void *newp, size_t newlen, struct proc *p) 261 { 262 return (EOPNOTSUPP); 263 } 264 #ifdef DEBUG 265 int 266 linux_debug_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 267 void *newp, size_t newlen, struct proc *p) 268 { 269 return (EOPNOTSUPP); 270 } 271 #endif /* DEBUG */ 272 273 int 274 linux_dev_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 275 void *newp, size_t newlen, struct proc *p) 276 { 277 return (EOPNOTSUPP); 278 } 279 280 int 281 linux_bus_sysctl(int *name, u_int nlen, void *oldp, size_t *oldlenp, 282 void *newp, size_t newlen, struct proc *p) 283 { 284 return (EOPNOTSUPP); 285 } 286