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         int     pr_use_linux26; /* flag to determine whether to use 2.6 emulation */
   56 };
   57 
   58 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
   59             "Linux mode");
   60 
   61 static struct mtx osname_lock;
   62 MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
   63 
   64 static char     linux_osname[LINUX_MAX_UTSNAME] = "Linux";
   65 
   66 static int
   67 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
   68 {
   69         char osname[LINUX_MAX_UTSNAME];
   70         int error;
   71 
   72         linux_get_osname(req->td, osname);
   73         error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
   74         if (error || req->newptr == NULL)
   75                 return (error);
   76         error = linux_set_osname(req->td, osname);
   77         return (error);
   78 }
   79 
   80 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
   81             CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
   82             0, 0, linux_sysctl_osname, "A",
   83             "Linux kernel OS name");
   84 
   85 static char     linux_osrelease[LINUX_MAX_UTSNAME] = "2.4.2";
   86 static int      linux_use_linux26 = 0;
   87 
   88 static int
   89 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
   90 {
   91         char osrelease[LINUX_MAX_UTSNAME];
   92         int error;
   93 
   94         linux_get_osrelease(req->td, osrelease);
   95         error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
   96         if (error || req->newptr == NULL)
   97                 return (error);
   98         error = linux_set_osrelease(req->td, osrelease);
   99         return (error);
  100 }
  101 
  102 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
  103             CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
  104             0, 0, linux_sysctl_osrelease, "A",
  105             "Linux kernel OS release");
  106 
  107 static int      linux_oss_version = 0x030600;
  108 
  109 static int
  110 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
  111 {
  112         int oss_version;
  113         int error;
  114 
  115         oss_version = linux_get_oss_version(req->td);
  116         error = sysctl_handle_int(oidp, &oss_version, 0, req);
  117         if (error || req->newptr == NULL)
  118                 return (error);
  119         error = linux_set_oss_version(req->td, oss_version);
  120         return (error);
  121 }
  122 
  123 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
  124             CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
  125             0, 0, linux_sysctl_oss_version, "I",
  126             "Linux OSS version");
  127 
  128 /*
  129  * Returns holding the prison mutex if return non-NULL.
  130  */
  131 static struct prison *
  132 linux_get_prison(struct thread *td)
  133 {
  134         register struct prison *pr;
  135         register struct linux_prison *lpr;
  136 
  137         KASSERT(td == curthread, ("linux_get_prison() called on !curthread"));
  138         if (!jailed(td->td_ucred))
  139                 return (NULL);
  140         pr = td->td_ucred->cr_prison;
  141         mtx_lock(&pr->pr_mtx);
  142         if (pr->pr_linux == NULL) {
  143                 /*
  144                  * If we don't have a linux prison structure yet, allocate
  145                  * one.  We have to handle the race where another thread
  146                  * could be adding a linux prison to this process already.
  147                  */
  148                 mtx_unlock(&pr->pr_mtx);
  149                 lpr = malloc(sizeof(struct linux_prison), M_PRISON,
  150                     M_WAITOK | M_ZERO);
  151                 mtx_lock(&pr->pr_mtx);
  152                 if (pr->pr_linux == NULL)
  153                         pr->pr_linux = lpr;
  154                 else
  155                         free(lpr, M_PRISON);
  156         }
  157         return (pr);
  158 }
  159 
  160 void
  161 linux_get_osname(struct thread *td, char *dst)
  162 {
  163         register struct prison *pr;
  164         register struct linux_prison *lpr;
  165 
  166         pr = td->td_ucred->cr_prison;
  167         if (pr != NULL) {
  168                 mtx_lock(&pr->pr_mtx);
  169                 if (pr->pr_linux != NULL) {
  170                         lpr = (struct linux_prison *)pr->pr_linux;
  171                         if (lpr->pr_osname[0]) {
  172                                 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
  173                                 mtx_unlock(&pr->pr_mtx);
  174                                 return;
  175                         }
  176                 }
  177                 mtx_unlock(&pr->pr_mtx);
  178         }
  179 
  180         mtx_lock(&osname_lock);
  181         bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
  182         mtx_unlock(&osname_lock);
  183 }
  184 
  185 int
  186 linux_set_osname(struct thread *td, char *osname)
  187 {
  188         struct prison *pr;
  189         struct linux_prison *lpr;
  190 
  191         pr = linux_get_prison(td);
  192         if (pr != NULL) {
  193                 lpr = (struct linux_prison *)pr->pr_linux;
  194                 strcpy(lpr->pr_osname, osname);
  195                 mtx_unlock(&pr->pr_mtx);
  196         } else {
  197                 mtx_lock(&osname_lock);
  198                 strcpy(linux_osname, osname);
  199                 mtx_unlock(&osname_lock);
  200         }
  201 
  202         return (0);
  203 }
  204 
  205 void
  206 linux_get_osrelease(struct thread *td, char *dst)
  207 {
  208         register struct prison *pr;
  209         struct linux_prison *lpr;
  210 
  211         pr = td->td_ucred->cr_prison;
  212         if (pr != NULL) {
  213                 mtx_lock(&pr->pr_mtx);
  214                 if (pr->pr_linux != NULL) {
  215                         lpr = (struct linux_prison *)pr->pr_linux;
  216                         if (lpr->pr_osrelease[0]) {
  217                                 bcopy(lpr->pr_osrelease, dst,
  218                                     LINUX_MAX_UTSNAME);
  219                                 mtx_unlock(&pr->pr_mtx);
  220                                 return;
  221                         }
  222                 }
  223                 mtx_unlock(&pr->pr_mtx);
  224         }
  225 
  226         mtx_lock(&osname_lock);
  227         bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
  228         mtx_unlock(&osname_lock);
  229 }
  230 
  231 int
  232 linux_use26(struct thread *td)
  233 {
  234         struct prison *pr;
  235         struct linux_prison *lpr;
  236         int use26 = linux_use_linux26;
  237 
  238         pr = td->td_ucred->cr_prison;
  239         if (pr != NULL) {
  240                 if (pr->pr_linux != NULL) {
  241                         lpr = (struct linux_prison *)pr->pr_linux;
  242                         use26 = lpr->pr_use_linux26;
  243                 }
  244         }
  245         
  246         return (use26);
  247 }
  248 
  249 int
  250 linux_set_osrelease(struct thread *td, char *osrelease)
  251 {
  252         struct prison *pr;
  253         struct linux_prison *lpr;
  254         int use26;
  255 
  256         use26 = (strlen(osrelease) >= 3 && osrelease[2] == '6');
  257 
  258         pr = linux_get_prison(td);
  259         if (pr != NULL) {
  260                 lpr = (struct linux_prison *)pr->pr_linux;
  261                 strcpy(lpr->pr_osrelease, osrelease);
  262                 lpr->pr_use_linux26 = use26;
  263                 mtx_unlock(&pr->pr_mtx);
  264         } else {
  265                 mtx_lock(&osname_lock);
  266                 strcpy(linux_osrelease, osrelease);
  267                 linux_use_linux26 = use26;
  268                 mtx_unlock(&osname_lock);
  269         }
  270 
  271         return (0);
  272 }
  273 
  274 int
  275 linux_get_oss_version(struct thread *td)
  276 {
  277         register struct prison *pr;
  278         register struct linux_prison *lpr;
  279         int version;
  280 
  281         pr = td->td_ucred->cr_prison;
  282         if (pr != NULL) {
  283                 mtx_lock(&pr->pr_mtx);
  284                 if (pr->pr_linux != NULL) {
  285                         lpr = (struct linux_prison *)pr->pr_linux;
  286                         if (lpr->pr_oss_version) {
  287                                 version = lpr->pr_oss_version;
  288                                 mtx_unlock(&pr->pr_mtx);
  289                                 return (version);
  290                         }
  291                 }
  292                 mtx_unlock(&pr->pr_mtx);
  293         }
  294 
  295         mtx_lock(&osname_lock);
  296         version = linux_oss_version;
  297         mtx_unlock(&osname_lock);
  298         return (version);
  299 }
  300 
  301 int
  302 linux_set_oss_version(struct thread *td, int oss_version)
  303 {
  304         struct prison *pr;
  305         struct linux_prison *lpr;
  306 
  307         pr = linux_get_prison(td);
  308         if (pr != NULL) {
  309                 lpr = (struct linux_prison *)pr->pr_linux;
  310                 lpr->pr_oss_version = oss_version;
  311                 mtx_unlock(&pr->pr_mtx);
  312         } else {
  313                 mtx_lock(&osname_lock);
  314                 linux_oss_version = oss_version;
  315                 mtx_unlock(&osname_lock);
  316         }
  317 
  318         return (0);
  319 }
  320 
  321 #ifdef DEBUG
  322 
  323 u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
  324 
  325 static int
  326 linux_debug(int syscall, int toggle, int global)
  327 {
  328 
  329         if (global) {
  330                 char c = toggle ? 0 : 0xff;
  331 
  332                 memset(linux_debug_map, c, sizeof(linux_debug_map));
  333                 return (0);
  334         }
  335         if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
  336                 return (EINVAL);
  337         if (toggle)
  338                 clrbit(linux_debug_map, syscall);
  339         else
  340                 setbit(linux_debug_map, syscall);
  341         return (0);
  342 }
  343 
  344 /*
  345  * Usage: sysctl linux.debug=<syscall_nr>.<0/1>
  346  *
  347  *    E.g.: sysctl linux.debug=21.0
  348  *
  349  * As a special case, syscall "all" will apply to all syscalls globally.
  350  */
  351 #define LINUX_MAX_DEBUGSTR      16
  352 static int
  353 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
  354 {
  355         char value[LINUX_MAX_DEBUGSTR], *p;
  356         int error, sysc, toggle;
  357         int global = 0;
  358 
  359         value[0] = '\0';
  360         error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
  361         if (error || req->newptr == NULL)
  362                 return (error);
  363         for (p = value; *p != '\0' && *p != '.'; p++);
  364         if (*p == '\0')
  365                 return (EINVAL);
  366         *p++ = '\0';
  367         sysc = strtol(value, NULL, 0);
  368         toggle = strtol(p, NULL, 0);
  369         if (strcmp(value, "all") == 0)
  370                 global = 1;
  371         error = linux_debug(sysc, toggle, global);
  372         return (error);
  373 }
  374 
  375 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
  376             CTLTYPE_STRING | CTLFLAG_RW,
  377             0, 0, linux_sysctl_debug, "A",
  378             "Linux debugging control");
  379 
  380 #endif /* DEBUG */

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