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("$FreeBSD$");
   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_mib_destroy(void)
  160 {
  161 
  162         mtx_destroy(&osname_lock);
  163 }
  164 
  165 void
  166 linux_get_osname(struct thread *td, char *dst)
  167 {
  168         register struct prison *pr;
  169         register struct linux_prison *lpr;
  170 
  171         pr = td->td_ucred->cr_prison;
  172         if (pr != NULL) {
  173                 mtx_lock(&pr->pr_mtx);
  174                 if (pr->pr_linux != NULL) {
  175                         lpr = (struct linux_prison *)pr->pr_linux;
  176                         if (lpr->pr_osname[0]) {
  177                                 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
  178                                 mtx_unlock(&pr->pr_mtx);
  179                                 return;
  180                         }
  181                 }
  182                 mtx_unlock(&pr->pr_mtx);
  183         }
  184 
  185         mtx_lock(&osname_lock);
  186         bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
  187         mtx_unlock(&osname_lock);
  188 }
  189 
  190 int
  191 linux_set_osname(struct thread *td, char *osname)
  192 {
  193         struct prison *pr;
  194         struct linux_prison *lpr;
  195 
  196         pr = linux_get_prison(td);
  197         if (pr != NULL) {
  198                 lpr = (struct linux_prison *)pr->pr_linux;
  199                 strcpy(lpr->pr_osname, osname);
  200                 mtx_unlock(&pr->pr_mtx);
  201         } else {
  202                 mtx_lock(&osname_lock);
  203                 strcpy(linux_osname, osname);
  204                 mtx_unlock(&osname_lock);
  205         }
  206 
  207         return (0);
  208 }
  209 
  210 void
  211 linux_get_osrelease(struct thread *td, char *dst)
  212 {
  213         register struct prison *pr;
  214         struct linux_prison *lpr;
  215 
  216         pr = td->td_ucred->cr_prison;
  217         if (pr != NULL) {
  218                 mtx_lock(&pr->pr_mtx);
  219                 if (pr->pr_linux != NULL) {
  220                         lpr = (struct linux_prison *)pr->pr_linux;
  221                         if (lpr->pr_osrelease[0]) {
  222                                 bcopy(lpr->pr_osrelease, dst,
  223                                     LINUX_MAX_UTSNAME);
  224                                 mtx_unlock(&pr->pr_mtx);
  225                                 return;
  226                         }
  227                 }
  228                 mtx_unlock(&pr->pr_mtx);
  229         }
  230 
  231         mtx_lock(&osname_lock);
  232         bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
  233         mtx_unlock(&osname_lock);
  234 }
  235 
  236 int
  237 linux_set_osrelease(struct thread *td, char *osrelease)
  238 {
  239         struct prison *pr;
  240         struct linux_prison *lpr;
  241 
  242         pr = linux_get_prison(td);
  243         if (pr != NULL) {
  244                 lpr = (struct linux_prison *)pr->pr_linux;
  245                 strcpy(lpr->pr_osrelease, osrelease);
  246                 mtx_unlock(&pr->pr_mtx);
  247         } else {
  248                 mtx_lock(&osname_lock);
  249                 strcpy(linux_osrelease, osrelease);
  250                 mtx_unlock(&osname_lock);
  251         }
  252 
  253         return (0);
  254 }
  255 
  256 int
  257 linux_get_oss_version(struct thread *td)
  258 {
  259         register struct prison *pr;
  260         register struct linux_prison *lpr;
  261         int version;
  262 
  263         pr = td->td_ucred->cr_prison;
  264         if (pr != NULL) {
  265                 mtx_lock(&pr->pr_mtx);
  266                 if (pr->pr_linux != NULL) {
  267                         lpr = (struct linux_prison *)pr->pr_linux;
  268                         if (lpr->pr_oss_version) {
  269                                 version = lpr->pr_oss_version;
  270                                 mtx_unlock(&pr->pr_mtx);
  271                                 return (version);
  272                         }
  273                 }
  274                 mtx_unlock(&pr->pr_mtx);
  275         }
  276 
  277         mtx_lock(&osname_lock);
  278         version = linux_oss_version;
  279         mtx_unlock(&osname_lock);
  280         return (version);
  281 }
  282 
  283 int
  284 linux_set_oss_version(struct thread *td, int oss_version)
  285 {
  286         struct prison *pr;
  287         struct linux_prison *lpr;
  288 
  289         pr = linux_get_prison(td);
  290         if (pr != NULL) {
  291                 lpr = (struct linux_prison *)pr->pr_linux;
  292                 lpr->pr_oss_version = oss_version;
  293                 mtx_unlock(&pr->pr_mtx);
  294         } else {
  295                 mtx_lock(&osname_lock);
  296                 linux_oss_version = oss_version;
  297                 mtx_unlock(&osname_lock);
  298         }
  299 
  300         return (0);
  301 }
  302 
  303 #ifdef DEBUG
  304 
  305 u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
  306 
  307 static int
  308 linux_debug(int syscall, int toggle, int global)
  309 {
  310 
  311         if (global) {
  312                 char c = toggle ? 0 : 0xff;
  313 
  314                 memset(linux_debug_map, c, sizeof(linux_debug_map));
  315                 return (0);
  316         }
  317         if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
  318                 return (EINVAL);
  319         if (toggle)
  320                 clrbit(linux_debug_map, syscall);
  321         else
  322                 setbit(linux_debug_map, syscall);
  323         return (0);
  324 }
  325 
  326 /*
  327  * Usage: sysctl linux.debug=<syscall_nr>.<0/1>
  328  *
  329  *    E.g.: sysctl linux.debug=21.0
  330  *
  331  * As a special case, syscall "all" will apply to all syscalls globally.
  332  */
  333 #define LINUX_MAX_DEBUGSTR      16
  334 static int
  335 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
  336 {
  337         char value[LINUX_MAX_DEBUGSTR], *p;
  338         int error, sysc, toggle;
  339         int global = 0;
  340 
  341         value[0] = '\0';
  342         error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
  343         if (error || req->newptr == NULL)
  344                 return (error);
  345         for (p = value; *p != '\0' && *p != '.'; p++);
  346         if (*p == '\0')
  347                 return (EINVAL);
  348         *p++ = '\0';
  349         sysc = strtol(value, NULL, 0);
  350         toggle = strtol(p, NULL, 0);
  351         if (strcmp(value, "all") == 0)
  352                 global = 1;
  353         error = linux_debug(sysc, toggle, global);
  354         return (error);
  355 }
  356 
  357 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
  358             CTLTYPE_STRING | CTLFLAG_RW,
  359             0, 0, linux_sysctl_debug, "A",
  360             "Linux debugging control");
  361 
  362 #endif /* DEBUG */

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