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/kern/kern_xxx.c

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.  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  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/11/sys/kern/kern_xxx.c 331722 2018-03-29 02:50:57Z eadler $");
   34 
   35 #include "opt_compat.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/kernel.h>
   41 #include <sys/priv.h>
   42 #include <sys/proc.h>
   43 #include <sys/lock.h>
   44 #include <sys/mutex.h>
   45 #include <sys/socket.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/utsname.h>
   48 
   49 #include <vm/vm_param.h>
   50 
   51 #if defined(COMPAT_43)
   52 
   53 #ifndef _SYS_SYSPROTO_H_
   54 struct gethostname_args {
   55         char    *hostname;
   56         u_int   len;
   57 };
   58 #endif
   59 /* ARGSUSED */
   60 int
   61 ogethostname(struct thread *td, struct gethostname_args *uap)
   62 {
   63         int name[2];
   64         size_t len = uap->len;
   65 
   66         name[0] = CTL_KERN;
   67         name[1] = KERN_HOSTNAME;
   68         return (userland_sysctl(td, name, 2, uap->hostname, &len,
   69             1, 0, 0, 0, 0));
   70 }
   71 
   72 #ifndef _SYS_SYSPROTO_H_
   73 struct sethostname_args {
   74         char    *hostname;
   75         u_int   len;
   76 };
   77 #endif
   78 /* ARGSUSED */
   79 int
   80 osethostname(struct thread *td, struct sethostname_args *uap)
   81 {
   82         int name[2];
   83 
   84         name[0] = CTL_KERN;
   85         name[1] = KERN_HOSTNAME;
   86         return (userland_sysctl(td, name, 2, 0, 0, 0, uap->hostname,
   87             uap->len, 0, 0));
   88 }
   89 
   90 #ifndef _SYS_SYSPROTO_H_
   91 struct ogethostid_args {
   92         int     dummy;
   93 };
   94 #endif
   95 /* ARGSUSED */
   96 int
   97 ogethostid(struct thread *td, struct ogethostid_args *uap)
   98 {
   99         size_t len = sizeof(long);
  100         int name[2];
  101 
  102         name[0] = CTL_KERN;
  103         name[1] = KERN_HOSTID;
  104         return (kernel_sysctl(td, name, 2, (long *)td->td_retval, &len,
  105             NULL, 0, NULL, 0));
  106 }
  107 #endif /* COMPAT_43 */
  108 
  109 #ifdef COMPAT_43
  110 #ifndef _SYS_SYSPROTO_H_
  111 struct osethostid_args {
  112         long    hostid;
  113 };
  114 #endif
  115 /* ARGSUSED */
  116 int
  117 osethostid(struct thread *td, struct osethostid_args *uap)
  118 {
  119         int name[2];
  120 
  121         name[0] = CTL_KERN;
  122         name[1] = KERN_HOSTID;
  123         return (kernel_sysctl(td, name, 2, NULL, NULL, &uap->hostid,
  124             sizeof(uap->hostid), NULL, 0));
  125 }
  126 
  127 int
  128 oquota(struct thread *td, struct oquota_args *uap)
  129 {
  130 
  131         return (ENOSYS);
  132 }
  133 
  134 #define KINFO_PROC              (0<<8)
  135 #define KINFO_RT                (1<<8)
  136 #define KINFO_VNODE             (2<<8)
  137 #define KINFO_FILE              (3<<8)
  138 #define KINFO_METER             (4<<8)
  139 #define KINFO_LOADAVG           (5<<8)
  140 #define KINFO_CLOCKRATE         (6<<8)
  141 
  142 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
  143 #define KINFO_BSDI_SYSINFO      (101<<8)
  144 
  145 /*
  146  * XXX this is bloat, but I hope it's better here than on the potentially
  147  * limited kernel stack...  -Peter
  148  */
  149 
  150 static struct {
  151         int     bsdi_machine;           /* "i386" on BSD/386 */
  152 /*      ^^^ this is an offset to the string, relative to the struct start */
  153         char    *pad0;
  154         long    pad1;
  155         long    pad2;
  156         long    pad3;
  157         u_long  pad4;
  158         u_long  pad5;
  159         u_long  pad6;
  160 
  161         int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
  162         int     bsdi_osrelease;         /* "1.1" on BSD/386 */
  163         long    pad7;
  164         long    pad8;
  165         char    *pad9;
  166 
  167         long    pad10;
  168         long    pad11;
  169         int     pad12;
  170         long    pad13;
  171         quad_t  pad14;
  172         long    pad15;
  173 
  174         struct  timeval pad16;
  175         /* we dont set this, because BSDI's uname used gethostname() instead */
  176         int     bsdi_hostname;          /* hostname on BSD/386 */
  177 
  178         /* the actual string data is appended here */
  179 
  180 } bsdi_si;
  181 
  182 /*
  183  * this data is appended to the end of the bsdi_si structure during copyout.
  184  * The "char *" offsets are relative to the base of the bsdi_si struct.
  185  * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
  186  * should not exceed the length of the buffer here... (or else!! :-)
  187  */
  188 static char bsdi_strings[80];   /* It had better be less than this! */
  189 
  190 #ifndef _SYS_SYSPROTO_H_
  191 struct getkerninfo_args {
  192         int     op;
  193         char    *where;
  194         size_t  *size;
  195         int     arg;
  196 };
  197 #endif
  198 int
  199 ogetkerninfo(struct thread *td, struct getkerninfo_args *uap)
  200 {
  201         int error, name[6];
  202         size_t size;
  203         u_int needed = 0;
  204 
  205         switch (uap->op & 0xff00) {
  206 
  207         case KINFO_RT:
  208                 name[0] = CTL_NET;
  209                 name[1] = PF_ROUTE;
  210                 name[2] = 0;
  211                 name[3] = (uap->op & 0xff0000) >> 16;
  212                 name[4] = uap->op & 0xff;
  213                 name[5] = uap->arg;
  214                 error = userland_sysctl(td, name, 6, uap->where, uap->size,
  215                         0, 0, 0, &size, 0);
  216                 break;
  217 
  218         case KINFO_VNODE:
  219                 name[0] = CTL_KERN;
  220                 name[1] = KERN_VNODE;
  221                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  222                         0, 0, 0, &size, 0);
  223                 break;
  224 
  225         case KINFO_PROC:
  226                 name[0] = CTL_KERN;
  227                 name[1] = KERN_PROC;
  228                 name[2] = uap->op & 0xff;
  229                 name[3] = uap->arg;
  230                 error = userland_sysctl(td, name, 4, uap->where, uap->size,
  231                         0, 0, 0, &size, 0);
  232                 break;
  233 
  234         case KINFO_FILE:
  235                 name[0] = CTL_KERN;
  236                 name[1] = KERN_FILE;
  237                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  238                         0, 0, 0, &size, 0);
  239                 break;
  240 
  241         case KINFO_METER:
  242                 name[0] = CTL_VM;
  243                 name[1] = VM_TOTAL;
  244                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  245                         0, 0, 0, &size, 0);
  246                 break;
  247 
  248         case KINFO_LOADAVG:
  249                 name[0] = CTL_VM;
  250                 name[1] = VM_LOADAVG;
  251                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  252                         0, 0, 0, &size, 0);
  253                 break;
  254 
  255         case KINFO_CLOCKRATE:
  256                 name[0] = CTL_KERN;
  257                 name[1] = KERN_CLOCKRATE;
  258                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  259                         0, 0, 0, &size, 0);
  260                 break;
  261 
  262         case KINFO_BSDI_SYSINFO: {
  263                 /*
  264                  * this is pretty crude, but it's just enough for uname()
  265                  * from BSDI's 1.x libc to work.
  266                  *
  267                  * *size gives the size of the buffer before the call, and
  268                  * the amount of data copied after a successful call.
  269                  * If successful, the return value is the amount of data
  270                  * available, which can be larger than *size.
  271                  *
  272                  * BSDI's 2.x product apparently fails with ENOMEM if *size
  273                  * is too small.
  274                  */
  275 
  276                 u_int left;
  277                 char *s;
  278 
  279                 bzero((char *)&bsdi_si, sizeof(bsdi_si));
  280                 bzero(bsdi_strings, sizeof(bsdi_strings));
  281 
  282                 s = bsdi_strings;
  283 
  284                 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
  285                 strcpy(s, ostype);
  286                 s += strlen(s) + 1;
  287 
  288                 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
  289                 strcpy(s, osrelease);
  290                 s += strlen(s) + 1;
  291 
  292                 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
  293                 strcpy(s, machine);
  294                 s += strlen(s) + 1;
  295 
  296                 needed = sizeof(bsdi_si) + (s - bsdi_strings);
  297 
  298                 if ((uap->where == NULL) || (uap->size == NULL)) {
  299                         /* process is asking how much buffer to supply.. */
  300                         size = needed;
  301                         error = 0;
  302                         break;
  303                 }
  304 
  305                 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
  306                         break;
  307 
  308                 /* if too much buffer supplied, trim it down */
  309                 if (size > needed)
  310                         size = needed;
  311 
  312                 /* how much of the buffer is remaining */
  313                 left = size;
  314 
  315                 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
  316                         break;
  317 
  318                 /* is there any point in continuing? */
  319                 if (left > sizeof(bsdi_si)) {
  320                         left -= sizeof(bsdi_si);
  321                         error = copyout(&bsdi_strings,
  322                                         uap->where + sizeof(bsdi_si), left);
  323                 }
  324                 break;
  325         }
  326 
  327         default:
  328                 error = EOPNOTSUPP;
  329                 break;
  330         }
  331         if (error == 0) {
  332                 td->td_retval[0] = needed ? needed : size;
  333                 if (uap->size) {
  334                         error = copyout(&size, uap->size, sizeof(size));
  335                 }
  336         }
  337         return (error);
  338 }
  339 #endif /* COMPAT_43 */
  340 
  341 #ifdef COMPAT_FREEBSD4
  342 /*
  343  * This is the FreeBSD-1.1 compatible uname(2) interface.  These days it is
  344  * done in libc as a wrapper around a bunch of sysctl's.  This must maintain
  345  * the old 1.1 binary ABI.
  346  */
  347 #if SYS_NMLN != 32
  348 #error "FreeBSD-1.1 uname syscall has been broken"
  349 #endif
  350 #ifndef _SYS_SYSPROTO_H_
  351 struct uname_args {
  352         struct utsname  *name;
  353 };
  354 #endif
  355 /* ARGSUSED */
  356 int
  357 freebsd4_uname(struct thread *td, struct freebsd4_uname_args *uap)
  358 {
  359         int name[2], error;
  360         size_t len;
  361         char *s, *us;
  362 
  363         name[0] = CTL_KERN;
  364         name[1] = KERN_OSTYPE;
  365         len = sizeof (uap->name->sysname);
  366         error = userland_sysctl(td, name, 2, uap->name->sysname, &len, 
  367                 1, 0, 0, 0, 0);
  368         if (error)
  369                 return (error);
  370         subyte( uap->name->sysname + sizeof(uap->name->sysname) - 1, 0);
  371 
  372         name[1] = KERN_HOSTNAME;
  373         len = sizeof uap->name->nodename;
  374         error = userland_sysctl(td, name, 2, uap->name->nodename, &len, 
  375                 1, 0, 0, 0, 0);
  376         if (error)
  377                 return (error);
  378         subyte( uap->name->nodename + sizeof(uap->name->nodename) - 1, 0);
  379 
  380         name[1] = KERN_OSRELEASE;
  381         len = sizeof uap->name->release;
  382         error = userland_sysctl(td, name, 2, uap->name->release, &len, 
  383                 1, 0, 0, 0, 0);
  384         if (error)
  385                 return (error);
  386         subyte( uap->name->release + sizeof(uap->name->release) - 1, 0);
  387 
  388 /*
  389         name = KERN_VERSION;
  390         len = sizeof uap->name->version;
  391         error = userland_sysctl(td, name, 2, uap->name->version, &len, 
  392                 1, 0, 0, 0, 0);
  393         if (error)
  394                 return (error);
  395         subyte( uap->name->version + sizeof(uap->name->version) - 1, 0);
  396 */
  397 
  398 /*
  399  * this stupid hackery to make the version field look like FreeBSD 1.1
  400  */
  401         for(s = version; *s && *s != '#'; s++);
  402 
  403         for(us = uap->name->version; *s && *s != ':'; s++) {
  404                 error = subyte( us++, *s);
  405                 if (error)
  406                         return (error);
  407         }
  408         error = subyte( us++, 0);
  409         if (error)
  410                 return (error);
  411 
  412         name[0] = CTL_HW;
  413         name[1] = HW_MACHINE;
  414         len = sizeof uap->name->machine;
  415         error = userland_sysctl(td, name, 2, uap->name->machine, &len, 
  416                 1, 0, 0, 0, 0);
  417         if (error)
  418                 return (error);
  419         subyte( uap->name->machine + sizeof(uap->name->machine) - 1, 0);
  420         return (0);
  421 }
  422 
  423 #ifndef _SYS_SYSPROTO_H_
  424 struct getdomainname_args {
  425         char    *domainname;
  426         int     len;
  427 };
  428 #endif
  429 /* ARGSUSED */
  430 int
  431 freebsd4_getdomainname(struct thread *td,
  432     struct freebsd4_getdomainname_args *uap)
  433 {
  434         int name[2];
  435         size_t len = uap->len;
  436 
  437         name[0] = CTL_KERN;
  438         name[1] = KERN_NISDOMAINNAME;
  439         return (userland_sysctl(td, name, 2, uap->domainname, &len,
  440             1, 0, 0, 0, 0));
  441 }
  442 
  443 #ifndef _SYS_SYSPROTO_H_
  444 struct setdomainname_args {
  445         char    *domainname;
  446         int     len;
  447 };
  448 #endif
  449 /* ARGSUSED */
  450 int
  451 freebsd4_setdomainname(struct thread *td,
  452     struct freebsd4_setdomainname_args *uap)
  453 {
  454         int name[2];
  455 
  456         name[0] = CTL_KERN;
  457         name[1] = KERN_NISDOMAINNAME;
  458         return (userland_sysctl(td, name, 2, 0, 0, 0, uap->domainname,
  459             uap->len, 0, 0));
  460 }
  461 #endif /* COMPAT_FREEBSD4 */

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