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_mib.c

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    1 /*-
    2  * Copyright (c) 1999 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/6.1/sys/compat/linux/linux_mib.c 153664 2005-12-22 21:25:20Z jhb $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/systm.h>
   35 #include <sys/sysctl.h>
   36 #include <sys/proc.h>
   37 #include <sys/malloc.h>
   38 #include <sys/jail.h>
   39 #include <sys/lock.h>
   40 #include <sys/mutex.h>
   41 
   42 #include "opt_compat.h"
   43 
   44 #ifdef COMPAT_LINUX32
   45 #include <machine/../linux32/linux.h>
   46 #else
   47 #include <machine/../linux/linux.h>
   48 #endif
   49 #include <compat/linux/linux_mib.h>
   50 
   51 struct linux_prison {
   52         char    pr_osname[LINUX_MAX_UTSNAME];
   53         char    pr_osrelease[LINUX_MAX_UTSNAME];
   54         int     pr_oss_version;
   55 };
   56 
   57 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
   58             "Linux mode");
   59 
   60 static struct mtx osname_lock;
   61 MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
   62 
   63 static char     linux_osname[LINUX_MAX_UTSNAME] = "Linux";
   64 
   65 static int
   66 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
   67 {
   68         char osname[LINUX_MAX_UTSNAME];
   69         int error;
   70 
   71         linux_get_osname(req->td, osname);
   72         error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
   73         if (error || req->newptr == NULL)
   74                 return (error);
   75         error = linux_set_osname(req->td, osname);
   76         return (error);
   77 }
   78 
   79 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
   80             CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
   81             0, 0, linux_sysctl_osname, "A",
   82             "Linux kernel OS name");
   83 
   84 static char     linux_osrelease[LINUX_MAX_UTSNAME] = "2.4.2";
   85 
   86 static int
   87 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
   88 {
   89         char osrelease[LINUX_MAX_UTSNAME];
   90         int error;
   91 
   92         linux_get_osrelease(req->td, osrelease);
   93         error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
   94         if (error || req->newptr == NULL)
   95                 return (error);
   96         error = linux_set_osrelease(req->td, osrelease);
   97         return (error);
   98 }
   99 
  100 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
  101             CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
  102             0, 0, linux_sysctl_osrelease, "A",
  103             "Linux kernel OS release");
  104 
  105 static int      linux_oss_version = 0x030600;
  106 
  107 static int
  108 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
  109 {
  110         int oss_version;
  111         int error;
  112 
  113         oss_version = linux_get_oss_version(req->td);
  114         error = sysctl_handle_int(oidp, &oss_version, 0, req);
  115         if (error || req->newptr == NULL)
  116                 return (error);
  117         error = linux_set_oss_version(req->td, oss_version);
  118         return (error);
  119 }
  120 
  121 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
  122             CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
  123             0, 0, linux_sysctl_oss_version, "I",
  124             "Linux OSS version");
  125 
  126 /*
  127  * Returns holding the prison mutex if return non-NULL.
  128  */
  129 static struct prison *
  130 linux_get_prison(struct thread *td)
  131 {
  132         register struct prison *pr;
  133         register struct linux_prison *lpr;
  134 
  135         KASSERT(td == curthread, ("linux_get_prison() called on !curthread"));
  136         if (!jailed(td->td_ucred))
  137                 return (NULL);
  138         pr = td->td_ucred->cr_prison;
  139         mtx_lock(&pr->pr_mtx);
  140         if (pr->pr_linux == NULL) {
  141                 /*
  142                  * If we don't have a linux prison structure yet, allocate
  143                  * one.  We have to handle the race where another thread
  144                  * could be adding a linux prison to this process already.
  145                  */
  146                 mtx_unlock(&pr->pr_mtx);
  147                 lpr = malloc(sizeof(struct linux_prison), M_PRISON,
  148                     M_WAITOK | M_ZERO);
  149                 mtx_lock(&pr->pr_mtx);
  150                 if (pr->pr_linux == NULL)
  151                         pr->pr_linux = lpr;
  152                 else
  153                         free(lpr, M_PRISON);
  154         }
  155         return (pr);
  156 }
  157 
  158 void
  159 linux_get_osname(struct thread *td, char *dst)
  160 {
  161         register struct prison *pr;
  162         register struct linux_prison *lpr;
  163 
  164         pr = td->td_ucred->cr_prison;
  165         if (pr != NULL) {
  166                 mtx_lock(&pr->pr_mtx);
  167                 if (pr->pr_linux != NULL) {
  168                         lpr = (struct linux_prison *)pr->pr_linux;
  169                         if (lpr->pr_osname[0]) {
  170                                 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
  171                                 mtx_unlock(&pr->pr_mtx);
  172                                 return;
  173                         }
  174                 }
  175                 mtx_unlock(&pr->pr_mtx);
  176         }
  177 
  178         mtx_lock(&osname_lock);
  179         bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
  180         mtx_unlock(&osname_lock);
  181 }
  182 
  183 int
  184 linux_set_osname(struct thread *td, char *osname)
  185 {
  186         struct prison *pr;
  187         struct linux_prison *lpr;
  188 
  189         pr = linux_get_prison(td);
  190         if (pr != NULL) {
  191                 lpr = (struct linux_prison *)pr->pr_linux;
  192                 strcpy(lpr->pr_osname, osname);
  193                 mtx_unlock(&pr->pr_mtx);
  194         } else {
  195                 mtx_lock(&osname_lock);
  196                 strcpy(linux_osname, osname);
  197                 mtx_unlock(&osname_lock);
  198         }
  199 
  200         return (0);
  201 }
  202 
  203 void
  204 linux_get_osrelease(struct thread *td, char *dst)
  205 {
  206         register struct prison *pr;
  207         struct linux_prison *lpr;
  208 
  209         pr = td->td_ucred->cr_prison;
  210         if (pr != NULL) {
  211                 mtx_lock(&pr->pr_mtx);
  212                 if (pr->pr_linux != NULL) {
  213                         lpr = (struct linux_prison *)pr->pr_linux;
  214                         if (lpr->pr_osrelease[0]) {
  215                                 bcopy(lpr->pr_osrelease, dst,
  216                                     LINUX_MAX_UTSNAME);
  217                                 mtx_unlock(&pr->pr_mtx);
  218                                 return;
  219                         }
  220                 }
  221                 mtx_unlock(&pr->pr_mtx);
  222         }
  223 
  224         mtx_lock(&osname_lock);
  225         bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
  226         mtx_unlock(&osname_lock);
  227 }
  228 
  229 int
  230 linux_set_osrelease(struct thread *td, char *osrelease)
  231 {
  232         struct prison *pr;
  233         struct linux_prison *lpr;
  234 
  235         pr = linux_get_prison(td);
  236         if (pr != NULL) {
  237                 lpr = (struct linux_prison *)pr->pr_linux;
  238                 strcpy(lpr->pr_osrelease, osrelease);
  239                 mtx_unlock(&pr->pr_mtx);
  240         } else {
  241                 mtx_lock(&osname_lock);
  242                 strcpy(linux_osrelease, osrelease);
  243                 mtx_unlock(&osname_lock);
  244         }
  245 
  246         return (0);
  247 }
  248 
  249 int
  250 linux_get_oss_version(struct thread *td)
  251 {
  252         register struct prison *pr;
  253         register struct linux_prison *lpr;
  254         int version;
  255 
  256         pr = td->td_ucred->cr_prison;
  257         if (pr != NULL) {
  258                 mtx_lock(&pr->pr_mtx);
  259                 if (pr->pr_linux != NULL) {
  260                         lpr = (struct linux_prison *)pr->pr_linux;
  261                         if (lpr->pr_oss_version) {
  262                                 version = lpr->pr_oss_version;
  263                                 mtx_unlock(&pr->pr_mtx);
  264                                 return (version);
  265                         }
  266                 }
  267                 mtx_unlock(&pr->pr_mtx);
  268         }
  269 
  270         mtx_lock(&osname_lock);
  271         version = linux_oss_version;
  272         mtx_unlock(&osname_lock);
  273         return (version);
  274 }
  275 
  276 int
  277 linux_set_oss_version(struct thread *td, int oss_version)
  278 {
  279         struct prison *pr;
  280         struct linux_prison *lpr;
  281 
  282         pr = linux_get_prison(td);
  283         if (pr != NULL) {
  284                 lpr = (struct linux_prison *)pr->pr_linux;
  285                 lpr->pr_oss_version = oss_version;
  286                 mtx_unlock(&pr->pr_mtx);
  287         } else {
  288                 mtx_lock(&osname_lock);
  289                 linux_oss_version = oss_version;
  290                 mtx_unlock(&osname_lock);
  291         }
  292 
  293         return (0);
  294 }
  295 
  296 #ifdef DEBUG
  297 
  298 u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
  299 
  300 static int
  301 linux_debug(int syscall, int toggle, int global)
  302 {
  303 
  304         if (global) {
  305                 char c = toggle ? 0 : 0xff;
  306 
  307                 memset(linux_debug_map, c, sizeof(linux_debug_map));
  308                 return (0);
  309         }
  310         if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
  311                 return (EINVAL);
  312         if (toggle)
  313                 clrbit(linux_debug_map, syscall);
  314         else
  315                 setbit(linux_debug_map, syscall);
  316         return (0);
  317 }
  318 
  319 /*
  320  * Usage: sysctl linux.debug=<syscall_nr>.<0/1>
  321  *
  322  *    E.g.: sysctl linux.debug=21.0
  323  *
  324  * As a special case, syscall "all" will apply to all syscalls globally.
  325  */
  326 #define LINUX_MAX_DEBUGSTR      16
  327 static int
  328 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
  329 {
  330         char value[LINUX_MAX_DEBUGSTR], *p;
  331         int error, sysc, toggle;
  332         int global = 0;
  333 
  334         value[0] = '\0';
  335         error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
  336         if (error || req->newptr == NULL)
  337                 return (error);
  338         for (p = value; *p != '\0' && *p != '.'; p++);
  339         if (*p == '\0')
  340                 return (EINVAL);
  341         *p++ = '\0';
  342         sysc = strtol(value, NULL, 0);
  343         toggle = strtol(p, NULL, 0);
  344         if (strcmp(value, "all") == 0)
  345                 global = 1;
  346         error = linux_debug(sysc, toggle, global);
  347         return (error);
  348 }
  349 
  350 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
  351             CTLTYPE_STRING | CTLFLAG_RW,
  352             0, 0, linux_sysctl_debug, "A",
  353             "Linux debugging control");
  354 
  355 #endif /* DEBUG */

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