The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_sysctl.c

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    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: releng/10.2/sys/compat/linux/linux_sysctl.c 246085 2013-01-29 18:41:30Z jhb $");
   31 
   32 #include "opt_compat.h"
   33 #include "opt_kdtrace.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mutex.h>
   40 #include <sys/proc.h>
   41 #include <sys/sdt.h>
   42 #include <sys/sysctl.h>
   43 #include <sys/systm.h>
   44 #include <sys/sbuf.h>
   45 
   46 #ifdef COMPAT_LINUX32
   47 #include <machine/../linux32/linux.h>
   48 #include <machine/../linux32/linux32_proto.h>
   49 #else
   50 #include <machine/../linux/linux.h>
   51 #include <machine/../linux/linux_proto.h>
   52 #endif
   53 
   54 #include <compat/linux/linux_dtrace.h>
   55 #include <compat/linux/linux_misc.h>
   56 #include <compat/linux/linux_util.h>
   57 
   58 #define LINUX_CTL_KERN          1
   59 #define LINUX_CTL_VM            2
   60 #define LINUX_CTL_NET           3
   61 #define LINUX_CTL_PROC          4
   62 #define LINUX_CTL_FS            5
   63 #define LINUX_CTL_DEBUG         6
   64 #define LINUX_CTL_DEV           7
   65 #define LINUX_CTL_BUS           8
   66 
   67 /* CTL_KERN names */
   68 #define LINUX_KERN_OSTYPE       1
   69 #define LINUX_KERN_OSRELEASE    2
   70 #define LINUX_KERN_OSREV        3
   71 #define LINUX_KERN_VERSION      4
   72 
   73 /* DTrace init */
   74 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
   75 
   76 /**
   77  * DTrace probes in this module.
   78  */
   79 LIN_SDT_PROBE_DEFINE2(sysctl, handle_string, entry, "struct l___sysctl_args *",
   80     "char *");
   81 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int");
   82 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, return, "int");
   83 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, entry, "struct l___sysctl_args *",
   84     "struct thread *");
   85 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int");
   86 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int");
   87 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *");
   88 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, return, "int");
   89 
   90 static int
   91 handle_string(struct l___sysctl_args *la, char *value)
   92 {
   93         int error;
   94 
   95         LIN_SDT_PROBE2(sysctl, handle_string, entry, la, value);
   96 
   97         if (la->oldval != 0) {
   98                 l_int len = strlen(value);
   99                 error = copyout(value, PTRIN(la->oldval), len + 1);
  100                 if (!error && la->oldlenp != 0)
  101                         error = copyout(&len, PTRIN(la->oldlenp), sizeof(len));
  102                 if (error) {
  103                         LIN_SDT_PROBE1(sysctl, handle_string, copyout_error,
  104                             error);
  105                         LIN_SDT_PROBE1(sysctl, handle_string, return, error);
  106                         return (error);
  107                 }
  108         }
  109 
  110         if (la->newval != 0) {
  111                 LIN_SDT_PROBE1(sysctl, handle_string, return, ENOTDIR);
  112                 return (ENOTDIR);
  113         }
  114 
  115         LIN_SDT_PROBE1(sysctl, handle_string, return, 0);
  116         return (0);
  117 }
  118 
  119 int
  120 linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
  121 {
  122         struct l___sysctl_args la;
  123         struct sbuf *sb;
  124         l_int *mib;
  125         char *sysctl_string;
  126         int error, i;
  127 
  128         LIN_SDT_PROBE2(sysctl, linux_sysctl, entry, td, args->args);
  129 
  130         error = copyin(args->args, &la, sizeof(la));
  131         if (error) {
  132                 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
  133                 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
  134                 return (error);
  135         }
  136 
  137         if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) {
  138                 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen,
  139                     LINUX_CTL_MAXNAME);
  140                 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR);
  141                 return (ENOTDIR);
  142         }
  143 
  144         mib = malloc(la.nlen * sizeof(l_int), M_TEMP, M_WAITOK);
  145         error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int));
  146         if (error) {
  147                 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
  148                 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
  149                 free(mib, M_TEMP);
  150                 return (error);
  151         }
  152 
  153         switch (mib[0]) {
  154         case LINUX_CTL_KERN:
  155                 if (la.nlen < 2)
  156                         break;
  157 
  158                 switch (mib[1]) {
  159                 case LINUX_KERN_VERSION:
  160                         error = handle_string(&la, version);
  161                         free(mib, M_TEMP);
  162                         LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
  163                         return (error);
  164                 default:
  165                         break;
  166                 }
  167                 break;
  168         default:
  169                 break;
  170         }
  171 
  172         sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
  173         if (sb == NULL) {
  174                 linux_msg(td, "sysctl is not implemented");
  175                 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
  176                     "unknown sysctl, ENOMEM during lookup");
  177         } else {
  178                 sbuf_printf(sb, "sysctl ");
  179                 for (i = 0; i < la.nlen; i++)
  180                         sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
  181                 sbuf_printf(sb, "} is not implemented");
  182                 sbuf_finish(sb);
  183                 sysctl_string = sbuf_data(sb);
  184                 linux_msg(td, "%s", sbuf_data(sb));
  185                 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
  186                     sysctl_string);
  187                 sbuf_delete(sb);
  188         }
  189 
  190         free(mib, M_TEMP);
  191 
  192         LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR);
  193         return (ENOTDIR);
  194 }

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