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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: head/sys/kern/kern_xxx.c 341474 2018-12-04 16:48:47Z brooks $");
   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 int
   54 ogethostname(struct thread *td, struct ogethostname_args *uap)
   55 {
   56         int name[2];
   57         size_t len = uap->len;
   58 
   59         name[0] = CTL_KERN;
   60         name[1] = KERN_HOSTNAME;
   61         return (userland_sysctl(td, name, 2, uap->hostname, &len,
   62             1, 0, 0, 0, 0));
   63 }
   64 
   65 int
   66 osethostname(struct thread *td, struct osethostname_args *uap)
   67 {
   68         int name[2];
   69 
   70         name[0] = CTL_KERN;
   71         name[1] = KERN_HOSTNAME;
   72         return (userland_sysctl(td, name, 2, 0, 0, 0, uap->hostname,
   73             uap->len, 0, 0));
   74 }
   75 
   76 #ifndef _SYS_SYSPROTO_H_
   77 struct ogethostid_args {
   78         int     dummy;
   79 };
   80 #endif
   81 /* ARGSUSED */
   82 int
   83 ogethostid(struct thread *td, struct ogethostid_args *uap)
   84 {
   85         size_t len = sizeof(long);
   86         int name[2];
   87 
   88         name[0] = CTL_KERN;
   89         name[1] = KERN_HOSTID;
   90         return (kernel_sysctl(td, name, 2, (long *)td->td_retval, &len,
   91             NULL, 0, NULL, 0));
   92 }
   93 
   94 int
   95 osethostid(struct thread *td, struct osethostid_args *uap)
   96 {
   97         int name[2];
   98 
   99         name[0] = CTL_KERN;
  100         name[1] = KERN_HOSTID;
  101         return (kernel_sysctl(td, name, 2, NULL, NULL, &uap->hostid,
  102             sizeof(uap->hostid), NULL, 0));
  103 }
  104 
  105 int
  106 oquota(struct thread *td, struct oquota_args *uap)
  107 {
  108 
  109         return (ENOSYS);
  110 }
  111 
  112 #define KINFO_PROC              (0<<8)
  113 #define KINFO_RT                (1<<8)
  114 #define KINFO_VNODE             (2<<8)
  115 #define KINFO_FILE              (3<<8)
  116 #define KINFO_METER             (4<<8)
  117 #define KINFO_LOADAVG           (5<<8)
  118 #define KINFO_CLOCKRATE         (6<<8)
  119 
  120 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
  121 #define KINFO_BSDI_SYSINFO      (101<<8)
  122 
  123 /*
  124  * XXX this is bloat, but I hope it's better here than on the potentially
  125  * limited kernel stack...  -Peter
  126  */
  127 
  128 static struct {
  129         int     bsdi_machine;           /* "i386" on BSD/386 */
  130 /*      ^^^ this is an offset to the string, relative to the struct start */
  131         char    *pad0;
  132         long    pad1;
  133         long    pad2;
  134         long    pad3;
  135         u_long  pad4;
  136         u_long  pad5;
  137         u_long  pad6;
  138 
  139         int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
  140         int     bsdi_osrelease;         /* "1.1" on BSD/386 */
  141         long    pad7;
  142         long    pad8;
  143         char    *pad9;
  144 
  145         long    pad10;
  146         long    pad11;
  147         int     pad12;
  148         long    pad13;
  149         quad_t  pad14;
  150         long    pad15;
  151 
  152         struct  timeval pad16;
  153         /* we dont set this, because BSDI's uname used gethostname() instead */
  154         int     bsdi_hostname;          /* hostname on BSD/386 */
  155 
  156         /* the actual string data is appended here */
  157 
  158 } bsdi_si;
  159 
  160 /*
  161  * this data is appended to the end of the bsdi_si structure during copyout.
  162  * The "char *" offsets are relative to the base of the bsdi_si struct.
  163  * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
  164  * should not exceed the length of the buffer here... (or else!! :-)
  165  */
  166 static char bsdi_strings[80];   /* It had better be less than this! */
  167 
  168 int
  169 ogetkerninfo(struct thread *td, struct ogetkerninfo_args *uap)
  170 {
  171         int error, name[6];
  172         size_t size;
  173         u_int needed = 0;
  174 
  175         switch (uap->op & 0xff00) {
  176 
  177         case KINFO_RT:
  178                 name[0] = CTL_NET;
  179                 name[1] = PF_ROUTE;
  180                 name[2] = 0;
  181                 name[3] = (uap->op & 0xff0000) >> 16;
  182                 name[4] = uap->op & 0xff;
  183                 name[5] = uap->arg;
  184                 error = userland_sysctl(td, name, 6, uap->where, uap->size,
  185                         0, 0, 0, &size, 0);
  186                 break;
  187 
  188         case KINFO_VNODE:
  189                 name[0] = CTL_KERN;
  190                 name[1] = KERN_VNODE;
  191                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  192                         0, 0, 0, &size, 0);
  193                 break;
  194 
  195         case KINFO_PROC:
  196                 name[0] = CTL_KERN;
  197                 name[1] = KERN_PROC;
  198                 name[2] = uap->op & 0xff;
  199                 name[3] = uap->arg;
  200                 error = userland_sysctl(td, name, 4, uap->where, uap->size,
  201                         0, 0, 0, &size, 0);
  202                 break;
  203 
  204         case KINFO_FILE:
  205                 name[0] = CTL_KERN;
  206                 name[1] = KERN_FILE;
  207                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  208                         0, 0, 0, &size, 0);
  209                 break;
  210 
  211         case KINFO_METER:
  212                 name[0] = CTL_VM;
  213                 name[1] = VM_TOTAL;
  214                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  215                         0, 0, 0, &size, 0);
  216                 break;
  217 
  218         case KINFO_LOADAVG:
  219                 name[0] = CTL_VM;
  220                 name[1] = VM_LOADAVG;
  221                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  222                         0, 0, 0, &size, 0);
  223                 break;
  224 
  225         case KINFO_CLOCKRATE:
  226                 name[0] = CTL_KERN;
  227                 name[1] = KERN_CLOCKRATE;
  228                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  229                         0, 0, 0, &size, 0);
  230                 break;
  231 
  232         case KINFO_BSDI_SYSINFO: {
  233                 /*
  234                  * this is pretty crude, but it's just enough for uname()
  235                  * from BSDI's 1.x libc to work.
  236                  *
  237                  * *size gives the size of the buffer before the call, and
  238                  * the amount of data copied after a successful call.
  239                  * If successful, the return value is the amount of data
  240                  * available, which can be larger than *size.
  241                  *
  242                  * BSDI's 2.x product apparently fails with ENOMEM if *size
  243                  * is too small.
  244                  */
  245 
  246                 u_int left;
  247                 char *s;
  248 
  249                 bzero((char *)&bsdi_si, sizeof(bsdi_si));
  250                 bzero(bsdi_strings, sizeof(bsdi_strings));
  251 
  252                 s = bsdi_strings;
  253 
  254                 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
  255                 strcpy(s, ostype);
  256                 s += strlen(s) + 1;
  257 
  258                 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
  259                 strcpy(s, osrelease);
  260                 s += strlen(s) + 1;
  261 
  262                 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
  263                 strcpy(s, machine);
  264                 s += strlen(s) + 1;
  265 
  266                 needed = sizeof(bsdi_si) + (s - bsdi_strings);
  267 
  268                 if ((uap->where == NULL) || (uap->size == NULL)) {
  269                         /* process is asking how much buffer to supply.. */
  270                         size = needed;
  271                         error = 0;
  272                         break;
  273                 }
  274 
  275                 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
  276                         break;
  277 
  278                 /* if too much buffer supplied, trim it down */
  279                 if (size > needed)
  280                         size = needed;
  281 
  282                 /* how much of the buffer is remaining */
  283                 left = size;
  284 
  285                 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
  286                         break;
  287 
  288                 /* is there any point in continuing? */
  289                 if (left > sizeof(bsdi_si)) {
  290                         left -= sizeof(bsdi_si);
  291                         error = copyout(&bsdi_strings,
  292                                         uap->where + sizeof(bsdi_si), left);
  293                 }
  294                 break;
  295         }
  296 
  297         default:
  298                 error = EOPNOTSUPP;
  299                 break;
  300         }
  301         if (error == 0) {
  302                 td->td_retval[0] = needed ? needed : size;
  303                 if (uap->size) {
  304                         error = copyout(&size, uap->size, sizeof(size));
  305                 }
  306         }
  307         return (error);
  308 }
  309 #endif /* COMPAT_43 */
  310 
  311 #ifdef COMPAT_FREEBSD4
  312 /*
  313  * This is the FreeBSD-1.1 compatible uname(2) interface.  These days it is
  314  * done in libc as a wrapper around a bunch of sysctl's.  This must maintain
  315  * the old 1.1 binary ABI.
  316  */
  317 #if SYS_NMLN != 32
  318 #error "FreeBSD-1.1 uname syscall has been broken"
  319 #endif
  320 #ifndef _SYS_SYSPROTO_H_
  321 struct uname_args {
  322         struct utsname  *name;
  323 };
  324 #endif
  325 /* ARGSUSED */
  326 int
  327 freebsd4_uname(struct thread *td, struct freebsd4_uname_args *uap)
  328 {
  329         int name[2], error;
  330         size_t len;
  331         char *s, *us;
  332 
  333         name[0] = CTL_KERN;
  334         name[1] = KERN_OSTYPE;
  335         len = sizeof (uap->name->sysname);
  336         error = userland_sysctl(td, name, 2, uap->name->sysname, &len, 
  337                 1, 0, 0, 0, 0);
  338         if (error)
  339                 return (error);
  340         subyte( uap->name->sysname + sizeof(uap->name->sysname) - 1, 0);
  341 
  342         name[1] = KERN_HOSTNAME;
  343         len = sizeof uap->name->nodename;
  344         error = userland_sysctl(td, name, 2, uap->name->nodename, &len, 
  345                 1, 0, 0, 0, 0);
  346         if (error)
  347                 return (error);
  348         subyte( uap->name->nodename + sizeof(uap->name->nodename) - 1, 0);
  349 
  350         name[1] = KERN_OSRELEASE;
  351         len = sizeof uap->name->release;
  352         error = userland_sysctl(td, name, 2, uap->name->release, &len, 
  353                 1, 0, 0, 0, 0);
  354         if (error)
  355                 return (error);
  356         subyte( uap->name->release + sizeof(uap->name->release) - 1, 0);
  357 
  358 /*
  359         name = KERN_VERSION;
  360         len = sizeof uap->name->version;
  361         error = userland_sysctl(td, name, 2, uap->name->version, &len, 
  362                 1, 0, 0, 0, 0);
  363         if (error)
  364                 return (error);
  365         subyte( uap->name->version + sizeof(uap->name->version) - 1, 0);
  366 */
  367 
  368 /*
  369  * this stupid hackery to make the version field look like FreeBSD 1.1
  370  */
  371         for(s = version; *s && *s != '#'; s++);
  372 
  373         for(us = uap->name->version; *s && *s != ':'; s++) {
  374                 error = subyte( us++, *s);
  375                 if (error)
  376                         return (error);
  377         }
  378         error = subyte( us++, 0);
  379         if (error)
  380                 return (error);
  381 
  382         name[0] = CTL_HW;
  383         name[1] = HW_MACHINE;
  384         len = sizeof uap->name->machine;
  385         error = userland_sysctl(td, name, 2, uap->name->machine, &len, 
  386                 1, 0, 0, 0, 0);
  387         if (error)
  388                 return (error);
  389         subyte( uap->name->machine + sizeof(uap->name->machine) - 1, 0);
  390         return (0);
  391 }
  392 
  393 #ifndef _SYS_SYSPROTO_H_
  394 struct getdomainname_args {
  395         char    *domainname;
  396         int     len;
  397 };
  398 #endif
  399 /* ARGSUSED */
  400 int
  401 freebsd4_getdomainname(struct thread *td,
  402     struct freebsd4_getdomainname_args *uap)
  403 {
  404         int name[2];
  405         size_t len = uap->len;
  406 
  407         name[0] = CTL_KERN;
  408         name[1] = KERN_NISDOMAINNAME;
  409         return (userland_sysctl(td, name, 2, uap->domainname, &len,
  410             1, 0, 0, 0, 0));
  411 }
  412 
  413 #ifndef _SYS_SYSPROTO_H_
  414 struct setdomainname_args {
  415         char    *domainname;
  416         int     len;
  417 };
  418 #endif
  419 /* ARGSUSED */
  420 int
  421 freebsd4_setdomainname(struct thread *td,
  422     struct freebsd4_setdomainname_args *uap)
  423 {
  424         int name[2];
  425 
  426         name[0] = CTL_KERN;
  427         name[1] = KERN_NISDOMAINNAME;
  428         return (userland_sysctl(td, name, 2, 0, 0, 0, uap->domainname,
  429             uap->len, 0, 0));
  430 }
  431 #endif /* COMPAT_FREEBSD4 */

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