1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/lock.h> 34 #include <sys/malloc.h> 35 #include <sys/mutex.h> 36 #include <sys/sysctl.h> 37 #include <sys/sbuf.h> 38 #include <sys/vnode.h> 39 40 #ifdef COMPAT_LINUX32 41 #include <machine/../linux32/linux.h> 42 #include <machine/../linux32/linux32_proto.h> 43 #else 44 #include <machine/../linux/linux.h> 45 #include <machine/../linux/linux_proto.h> 46 #endif 47 48 #include <compat/linux/linux_dtrace.h> 49 #include <compat/linux/linux_misc.h> 50 #include <compat/linux/linux_util.h> 51 52 #define LINUX_CTL_KERN 1 53 #define LINUX_CTL_VM 2 54 #define LINUX_CTL_NET 3 55 #define LINUX_CTL_PROC 4 56 #define LINUX_CTL_FS 5 57 #define LINUX_CTL_DEBUG 6 58 #define LINUX_CTL_DEV 7 59 #define LINUX_CTL_BUS 8 60 61 /* CTL_KERN names */ 62 #define LINUX_KERN_OSTYPE 1 63 #define LINUX_KERN_OSRELEASE 2 64 #define LINUX_KERN_OSREV 3 65 #define LINUX_KERN_VERSION 4 66 67 /* DTrace init */ 68 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 69 70 /** 71 * DTrace probes in this module. 72 */ 73 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 74 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 75 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 76 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 77 78 #ifdef LINUX_LEGACY_SYSCALLS 79 static int 80 handle_string(struct l___sysctl_args *la, char *value) 81 { 82 int error; 83 84 if (la->oldval != 0) { 85 l_int len = strlen(value); 86 error = copyout(value, PTRIN(la->oldval), len + 1); 87 if (!error && la->oldlenp != 0) 88 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 89 if (error) { 90 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 91 error); 92 return (error); 93 } 94 } 95 96 if (la->newval != 0) 97 return (ENOTDIR); 98 99 return (0); 100 } 101 102 int 103 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 104 { 105 struct l___sysctl_args la; 106 struct sbuf *sb; 107 l_int *mib; 108 char *sysctl_string; 109 int error, i; 110 111 error = copyin(args->args, &la, sizeof(la)); 112 if (error) { 113 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 114 return (error); 115 } 116 117 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 118 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 119 LINUX_CTL_MAXNAME); 120 return (ENOTDIR); 121 } 122 123 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 124 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 125 if (error) { 126 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 127 free(mib, M_LINUX); 128 return (error); 129 } 130 131 switch (mib[0]) { 132 case LINUX_CTL_KERN: 133 if (la.nlen < 2) 134 break; 135 136 switch (mib[1]) { 137 case LINUX_KERN_VERSION: 138 error = handle_string(&la, version); 139 free(mib, M_LINUX); 140 return (error); 141 default: 142 break; 143 } 144 break; 145 default: 146 break; 147 } 148 149 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 150 if (sb == NULL) { 151 linux_msg(td, "sysctl is not implemented"); 152 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 153 "unknown sysctl, ENOMEM during lookup"); 154 } else { 155 sbuf_printf(sb, "sysctl "); 156 for (i = 0; i < la.nlen; i++) 157 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 158 sbuf_printf(sb, "} is not implemented"); 159 sbuf_finish(sb); 160 sysctl_string = sbuf_data(sb); 161 linux_msg(td, "%s", sysctl_string); 162 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 163 sysctl_string); 164 sbuf_delete(sb); 165 } 166 167 free(mib, M_LINUX); 168 169 return (ENOTDIR); 170 } 171 #endif 172