1 /*- 2 * Copyright (c) 2001 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/proc.h> 40 #include <sys/sdt.h> 41 #include <sys/sysctl.h> 42 #include <sys/systm.h> 43 #include <sys/sbuf.h> 44 45 #ifdef COMPAT_LINUX32 46 #include <machine/../linux32/linux.h> 47 #include <machine/../linux32/linux32_proto.h> 48 #else 49 #include <machine/../linux/linux.h> 50 #include <machine/../linux/linux_proto.h> 51 #endif 52 53 #include <compat/linux/linux_dtrace.h> 54 #include <compat/linux/linux_misc.h> 55 #include <compat/linux/linux_util.h> 56 57 #define LINUX_CTL_KERN 1 58 #define LINUX_CTL_VM 2 59 #define LINUX_CTL_NET 3 60 #define LINUX_CTL_PROC 4 61 #define LINUX_CTL_FS 5 62 #define LINUX_CTL_DEBUG 6 63 #define LINUX_CTL_DEV 7 64 #define LINUX_CTL_BUS 8 65 66 /* CTL_KERN names */ 67 #define LINUX_KERN_OSTYPE 1 68 #define LINUX_KERN_OSRELEASE 2 69 #define LINUX_KERN_OSREV 3 70 #define LINUX_KERN_VERSION 4 71 72 /* DTrace init */ 73 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 74 75 /** 76 * DTrace probes in this module. 77 */ 78 LIN_SDT_PROBE_DEFINE2(sysctl, handle_string, entry, "struct l___sysctl_args *", 79 "char *"); 80 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 81 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, return, "int"); 82 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, entry, "struct l___sysctl_args *", 83 "struct thread *"); 84 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 85 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 86 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 87 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, return, "int"); 88 89 static int 90 handle_string(struct l___sysctl_args *la, char *value) 91 { 92 int error; 93 94 LIN_SDT_PROBE2(sysctl, handle_string, entry, la, value); 95 96 if (la->oldval != 0) { 97 l_int len = strlen(value); 98 error = copyout(value, PTRIN(la->oldval), len + 1); 99 if (!error && la->oldlenp != 0) 100 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 101 if (error) { 102 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 103 error); 104 LIN_SDT_PROBE1(sysctl, handle_string, return, error); 105 return (error); 106 } 107 } 108 109 if (la->newval != 0) { 110 LIN_SDT_PROBE1(sysctl, handle_string, return, ENOTDIR); 111 return (ENOTDIR); 112 } 113 114 LIN_SDT_PROBE1(sysctl, handle_string, return, 0); 115 return (0); 116 } 117 118 int 119 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 120 { 121 struct l___sysctl_args la; 122 struct sbuf *sb; 123 l_int *mib; 124 char *sysctl_string; 125 int error, i; 126 127 LIN_SDT_PROBE2(sysctl, linux_sysctl, entry, td, args->args); 128 129 error = copyin(args->args, &la, sizeof(la)); 130 if (error) { 131 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 132 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 133 return (error); 134 } 135 136 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 137 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 138 LINUX_CTL_MAXNAME); 139 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR); 140 return (ENOTDIR); 141 } 142 143 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 144 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 145 if (error) { 146 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 147 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 148 free(mib, M_LINUX); 149 return (error); 150 } 151 152 switch (mib[0]) { 153 case LINUX_CTL_KERN: 154 if (la.nlen < 2) 155 break; 156 157 switch (mib[1]) { 158 case LINUX_KERN_VERSION: 159 error = handle_string(&la, version); 160 free(mib, M_LINUX); 161 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 162 return (error); 163 default: 164 break; 165 } 166 break; 167 default: 168 break; 169 } 170 171 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 172 if (sb == NULL) { 173 linux_msg(td, "sysctl is not implemented"); 174 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 175 "unknown sysctl, ENOMEM during lookup"); 176 } else { 177 sbuf_printf(sb, "sysctl "); 178 for (i = 0; i < la.nlen; i++) 179 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 180 sbuf_printf(sb, "} is not implemented"); 181 sbuf_finish(sb); 182 sysctl_string = sbuf_data(sb); 183 linux_msg(td, "%s", sbuf_data(sb)); 184 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 185 sysctl_string); 186 sbuf_delete(sb); 187 } 188 189 free(mib, M_LINUX); 190 191 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR); 192 return (ENOTDIR); 193 } 194