linux_sysctl.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    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 "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_DEFINE1(sysctl, handle_string, copyout_error, "int");
   79 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int");
   80 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int");
   81 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *");
   82 
   83 #ifdef LINUX_LEGACY_SYSCALLS
   84 static int
   85 handle_string(struct l___sysctl_args *la, char *value)
   86 {
   87         int error;
   88 
   89         if (la->oldval != 0) {
   90                 l_int len = strlen(value);
   91                 error = copyout(value, PTRIN(la->oldval), len + 1);
   92                 if (!error && la->oldlenp != 0)
   93                         error = copyout(&len, PTRIN(la->oldlenp), sizeof(len));
   94                 if (error) {
   95                         LIN_SDT_PROBE1(sysctl, handle_string, copyout_error,
   96                             error);
   97                         return (error);
   98                 }
   99         }
  100 
  101         if (la->newval != 0)
  102                 return (ENOTDIR);
  103 
  104         return (0);
  105 }
  106 
  107 int
  108 linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
  109 {
  110         struct l___sysctl_args la;
  111         struct sbuf *sb;
  112         l_int *mib;
  113         char *sysctl_string;
  114         int error, i;
  115 
  116         error = copyin(args->args, &la, sizeof(la));
  117         if (error) {
  118                 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
  119                 return (error);
  120         }
  121 
  122         if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) {
  123                 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen,
  124                     LINUX_CTL_MAXNAME);
  125                 return (ENOTDIR);
  126         }
  127 
  128         mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK);
  129         error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int));
  130         if (error) {
  131                 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
  132                 free(mib, M_LINUX);
  133                 return (error);
  134         }
  135 
  136         switch (mib[0]) {
  137         case LINUX_CTL_KERN:
  138                 if (la.nlen < 2)
  139                         break;
  140 
  141                 switch (mib[1]) {
  142                 case LINUX_KERN_VERSION:
  143                         error = handle_string(&la, version);
  144                         free(mib, M_LINUX);
  145                         return (error);
  146                 default:
  147                         break;
  148                 }
  149                 break;
  150         default:
  151                 break;
  152         }
  153 
  154         sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
  155         if (sb == NULL) {
  156                 linux_msg(td, "sysctl is not implemented");
  157                 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
  158                     "unknown sysctl, ENOMEM during lookup");
  159         } else {
  160                 sbuf_printf(sb, "sysctl ");
  161                 for (i = 0; i < la.nlen; i++)
  162                         sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
  163                 sbuf_printf(sb, "} is not implemented");
  164                 sbuf_finish(sb);
  165                 sysctl_string = sbuf_data(sb);
  166                 linux_msg(td, "%s", sysctl_string);
  167                 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
  168                     sysctl_string);
  169                 sbuf_delete(sb);
  170         }
  171 
  172         free(mib, M_LINUX);
  173 
  174         return (ENOTDIR);
  175 }
  176 #endif

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

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