| 1 | /* $NetBSD: linux_sysctl.c,v 1.43 2014/05/16 12:22:32 martin Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2003, 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Andrew Brown. |
| 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 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * sysctl system call. |
| 34 | */ |
| 35 | |
| 36 | #include <sys/cdefs.h> |
| 37 | __KERNEL_RCSID(0, "$NetBSD: linux_sysctl.c,v 1.43 2014/05/16 12:22:32 martin Exp $" ); |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/systm.h> |
| 41 | #include <sys/errno.h> |
| 42 | #include <sys/proc.h> |
| 43 | #include <sys/mount.h> |
| 44 | #include <sys/sysctl.h> |
| 45 | #include <sys/sched.h> |
| 46 | #include <sys/syscallargs.h> |
| 47 | #include <sys/ktrace.h> |
| 48 | |
| 49 | #include <compat/linux/common/linux_types.h> |
| 50 | #include <compat/linux/common/linux_signal.h> |
| 51 | #include <compat/linux/common/linux_ipc.h> |
| 52 | #include <compat/linux/common/linux_sem.h> |
| 53 | |
| 54 | #include <compat/linux/linux_syscallargs.h> |
| 55 | #include <compat/linux/common/linux_sysctl.h> |
| 56 | #include <compat/linux/common/linux_exec.h> |
| 57 | #include <compat/linux/common/linux_machdep.h> |
| 58 | |
| 59 | char linux_sysname[128] = "Linux" ; |
| 60 | char linux_release[128] = "3.11.6" ; |
| 61 | char linux_version[128] = "#1 SMP PREEMPT Thu Oct 24 16:23:02 UTC 2013" ; |
| 62 | |
| 63 | struct sysctlnode linux_sysctl_root = { |
| 64 | .sysctl_flags = SYSCTL_VERSION| |
| 65 | CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, |
| 66 | .sysctl_num = 0, |
| 67 | .sysctl_name = "(linux_root)" , |
| 68 | .sysctl_size = sizeof(struct sysctlnode), |
| 69 | }; |
| 70 | |
| 71 | static struct sysctllog *linux_clog1; |
| 72 | static struct sysctllog *linux_clog2; |
| 73 | |
| 74 | void |
| 75 | linux_sysctl_fini(void) |
| 76 | { |
| 77 | |
| 78 | sysctl_teardown(&linux_clog2); |
| 79 | sysctl_teardown(&linux_clog1); |
| 80 | sysctl_free(&linux_sysctl_root); |
| 81 | } |
| 82 | |
| 83 | void |
| 84 | linux_sysctl_init(void) |
| 85 | { |
| 86 | const struct sysctlnode *node = &linux_sysctl_root; |
| 87 | |
| 88 | sysctl_createv(&linux_clog1, 0, &node, &node, |
| 89 | CTLFLAG_PERMANENT, |
| 90 | CTLTYPE_NODE, "kern" , NULL, |
| 91 | NULL, 0, NULL, 0, |
| 92 | LINUX_CTL_KERN, CTL_EOL); |
| 93 | sysctl_createv(&linux_clog1, 0, &node, NULL, |
| 94 | CTLFLAG_PERMANENT, |
| 95 | CTLTYPE_STRING, "ostype" , NULL, |
| 96 | NULL, 0, linux_sysname, sizeof(linux_sysname), |
| 97 | LINUX_KERN_OSTYPE, CTL_EOL); |
| 98 | sysctl_createv(&linux_clog1, 0, &node, NULL, |
| 99 | CTLFLAG_PERMANENT, |
| 100 | CTLTYPE_STRING, "osrelease" , NULL, |
| 101 | NULL, 0, linux_release, sizeof(linux_release), |
| 102 | LINUX_KERN_OSRELEASE, CTL_EOL); |
| 103 | sysctl_createv(&linux_clog1, 0, &node, NULL, |
| 104 | CTLFLAG_PERMANENT, |
| 105 | CTLTYPE_STRING, "version" , NULL, |
| 106 | NULL, 0, linux_version, sizeof(linux_version), |
| 107 | LINUX_KERN_VERSION, CTL_EOL); |
| 108 | |
| 109 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
| 110 | CTLFLAG_PERMANENT, |
| 111 | CTLTYPE_NODE, "linux" , |
| 112 | SYSCTL_DESCR("Linux emulation settings" ), |
| 113 | NULL, 0, NULL, 0, |
| 114 | CTL_EMUL, EMUL_LINUX, CTL_EOL); |
| 115 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
| 116 | CTLFLAG_PERMANENT, |
| 117 | CTLTYPE_NODE, "kern" , |
| 118 | SYSCTL_DESCR("Linux kernel emulation settings" ), |
| 119 | NULL, 0, NULL, 0, |
| 120 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); |
| 121 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
| 122 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 123 | CTLTYPE_STRING, "ostype" , |
| 124 | SYSCTL_DESCR("Linux operating system type" ), |
| 125 | NULL, 0, linux_sysname, sizeof(linux_sysname), |
| 126 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, |
| 127 | EMUL_LINUX_KERN_OSTYPE, CTL_EOL); |
| 128 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
| 129 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 130 | CTLTYPE_STRING, "osrelease" , |
| 131 | SYSCTL_DESCR("Linux operating system release" ), |
| 132 | NULL, 0, linux_release, sizeof(linux_release), |
| 133 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, |
| 134 | EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); |
| 135 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
| 136 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 137 | CTLTYPE_STRING, "osversion" , |
| 138 | SYSCTL_DESCR("Linux operating system revision" ), |
| 139 | NULL, 0, linux_version, sizeof(linux_version), |
| 140 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, |
| 141 | EMUL_LINUX_KERN_VERSION, CTL_EOL); |
| 142 | |
| 143 | linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * linux sysctl system call |
| 148 | */ |
| 149 | int |
| 150 | linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) |
| 151 | { |
| 152 | struct linux___sysctl ls; |
| 153 | int error, nerror, name[CTL_MAXNAME]; |
| 154 | size_t savelen = 0, oldlen = 0; |
| 155 | |
| 156 | /* |
| 157 | * get linux args structure |
| 158 | */ |
| 159 | if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) |
| 160 | return error; |
| 161 | |
| 162 | /* |
| 163 | * get oldlen |
| 164 | */ |
| 165 | oldlen = 0; |
| 166 | if (ls.oldlenp != NULL) { |
| 167 | error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); |
| 168 | if (error) |
| 169 | return (error); |
| 170 | } |
| 171 | savelen = oldlen; |
| 172 | |
| 173 | /* |
| 174 | * top-level sysctl names may or may not be non-terminal, but |
| 175 | * we don't care |
| 176 | */ |
| 177 | if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) |
| 178 | return (ENOTDIR); |
| 179 | error = copyin(ls.name, &name, ls.nlen * sizeof(int)); |
| 180 | if (error) |
| 181 | return (error); |
| 182 | |
| 183 | ktrmib(name, ls.nlen); |
| 184 | |
| 185 | /* |
| 186 | * dispatch request into linux sysctl tree |
| 187 | */ |
| 188 | sysctl_lock(ls.newval != NULL); |
| 189 | error = sysctl_dispatch(&name[0], ls.nlen, |
| 190 | ls.oldval, &oldlen, |
| 191 | ls.newval, ls.newlen, |
| 192 | &name[0], l, &linux_sysctl_root); |
| 193 | sysctl_unlock(); |
| 194 | |
| 195 | /* |
| 196 | * reset caller's oldlen, even if we got an error |
| 197 | */ |
| 198 | if (ls.oldlenp) { |
| 199 | nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); |
| 200 | if (error == 0) |
| 201 | error = nerror; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * if the only problem is that we weren't given enough space, |
| 206 | * that's an ENOMEM error |
| 207 | */ |
| 208 | if (error == 0 && ls.oldval != NULL && savelen < oldlen) |
| 209 | error = ENOMEM; |
| 210 | |
| 211 | return (error); |
| 212 | } |
| 213 | |