sys/emulation/linux/linux_sysctl.c

   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  * $FreeBSD: src/sys/compat/linux/linux_sysctl.c,v 1.2.2.1 2001/10/21 03:57:35 marcel Exp $
  29  * $DragonFly: src/sys/emulation/linux/linux_sysctl.c,v 1.9 2006/12/23 00:27:02 swildner Exp $
  30  */
  31
  32 #include "opt_compat.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/proc.h>
  37 #include <sys/sysproto.h>
  38
  39 #include <sys/mplock2.h>
  40
  41 #include <arch_linux/linux.h>
  42 #include <arch_linux/linux_proto.h>
  43 #include "linux_util.h"
  44
  45 #define LINUX_CTL_KERN          1
  46 #define LINUX_CTL_VM            2
  47 #define LINUX_CTL_NET           3
  48 #define LINUX_CTL_PROC          4
  49 #define LINUX_CTL_FS            5
  50 #define LINUX_CTL_DEBUG         6
  51 #define LINUX_CTL_DEV           7
  52 #define LINUX_CTL_BUS           8
  53
  54 /* CTL_KERN names */
  55 #define LINUX_KERN_OSTYPE       1
  56 #define LINUX_KERN_OSRELEASE    2
  57 #define LINUX_KERN_OSREV        3
  58 #define LINUX_KERN_VERSION      4
  59
  60 static int
  61 handle_string(struct l___sysctl_args *la, char *value)
  62 {
  63         int error;
  64
  65         if (la->oldval != NULL) {
  66                 l_int len = strlen(value);
  67                 error = copyout(value, la->oldval, len + 1);
  68                 if (!error && la->oldlenp != NULL)
  69                         error = copyout(&len, la->oldlenp, sizeof(len));
  70                 if (error)
  71                         return (error);
  72         }
  73
  74         if (la->newval != NULL)
  75                 return (ENOTDIR);
  76
  77         return (0);
  78 }
  79
  80 /*
  81  * MPALMOSTSAFE
  82  */
  83 int
  84 sys_linux_sysctl(struct linux_sysctl_args *args)
  85 {
  86         struct l___sysctl_args la;
  87         l_int *mib;
  88         int error, i;
  89
  90         error = copyin((caddr_t)args->args, &la, sizeof(la));
  91         if (error)
  92                 return (error);
  93
  94         if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME)
  95                 return (ENOTDIR);
  96
  97         mib = kmalloc(la.nlen * sizeof(l_int), M_TEMP, M_WAITOK);
  98         error = copyin(la.name, mib, la.nlen * sizeof(l_int));
  99         if (error) {
 100                 kfree(mib, M_TEMP);
 101                 return (error);
 102         }
 103
 104         get_mplock();
 105
 106         switch (mib[0]) {
 107         case LINUX_CTL_KERN:
 108                 if (la.nlen < 2) {
 109                         error = ENOTDIR;
 110                         break;
 111                 }
 112
 113                 switch (mib[1]) {
 114                 case LINUX_KERN_VERSION:
 115                         error = handle_string(&la, version);
 116                         break;
 117                 default:
 118                         error = ENOTDIR;
 119                         break;
 120                 }
 121                 break;
 122         default:
 123                 error = ENOTDIR;
 124                 break;
 125         }
 126         rel_mplock();
 127
 128         if (error == ENOTDIR && mib) {
 129                 kprintf("linux: sysctl: unhandled name=");
 130                 for (i = 0; i < la.nlen; i++)
 131                         kprintf("%c%d", (i) ? ',' : '{', mib[i]);
 132                 kprintf("}\n");
 133         }
 134         if (mib)
 135                 kfree(mib, M_TEMP);
 136         return (error);
 137 }