The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_sysctl.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  * This code is derived from software contributed to Berkeley by
    6  * Mike Karels at Berkeley Software Design, Inc.
    7  *
    8  * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
    9  * project, to make these variables more userfriendly.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)kern_sysctl.c       8.4 (Berkeley) 4/14/94
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/6.3/sys/kern/kern_sysctl.c 173886 2007-11-24 19:45:58Z cvs2svn $");
   40 
   41 #include "opt_compat.h"
   42 #include "opt_mac.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/kernel.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/mac.h>
   49 #include <sys/malloc.h>
   50 #include <sys/proc.h>
   51 #include <sys/lock.h>
   52 #include <sys/mutex.h>
   53 #include <sys/sx.h>
   54 #include <sys/sysproto.h>
   55 #include <vm/vm.h>
   56 #include <vm/vm_extern.h>
   57 
   58 static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic");
   59 static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids");
   60 static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer");
   61 
   62 /*
   63  * Locking - this locks the sysctl tree in memory.
   64  */
   65 static struct sx sysctllock;
   66 
   67 #define SYSCTL_LOCK()           sx_xlock(&sysctllock)
   68 #define SYSCTL_UNLOCK()         sx_xunlock(&sysctllock)
   69 #define SYSCTL_INIT()           sx_init(&sysctllock, "sysctl lock")
   70 
   71 static int sysctl_root(SYSCTL_HANDLER_ARGS);
   72 
   73 struct sysctl_oid_list sysctl__children; /* root list */
   74 
   75 static struct sysctl_oid *
   76 sysctl_find_oidname(const char *name, struct sysctl_oid_list *list)
   77 {
   78         struct sysctl_oid *oidp;
   79 
   80         SLIST_FOREACH(oidp, list, oid_link) {
   81                 if (strcmp(oidp->oid_name, name) == 0) {
   82                         return (oidp);
   83                 }
   84         }
   85         return (NULL);
   86 }
   87 
   88 /*
   89  * Initialization of the MIB tree.
   90  *
   91  * Order by number in each list.
   92  */
   93 
   94 void
   95 sysctl_register_oid(struct sysctl_oid *oidp)
   96 {
   97         struct sysctl_oid_list *parent = oidp->oid_parent;
   98         struct sysctl_oid *p;
   99         struct sysctl_oid *q;
  100 
  101         /*
  102          * First check if another oid with the same name already
  103          * exists in the parent's list.
  104          */
  105         p = sysctl_find_oidname(oidp->oid_name, parent);
  106         if (p != NULL) {
  107                 if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
  108                         p->oid_refcnt++;
  109                         return;
  110                 } else {
  111                         printf("can't re-use a leaf (%s)!\n", p->oid_name);
  112                         return;
  113                 }
  114         }
  115         /*
  116          * If this oid has a number OID_AUTO, give it a number which
  117          * is greater than any current oid.
  118          * NOTE: DO NOT change the starting value here, change it in
  119          * <sys/sysctl.h>, and make sure it is at least 256 to
  120          * accomodate e.g. net.inet.raw as a static sysctl node.
  121          */
  122         if (oidp->oid_number == OID_AUTO) {
  123                 static int newoid = CTL_AUTO_START;
  124 
  125                 oidp->oid_number = newoid++;
  126                 if (newoid == 0x7fffffff)
  127                         panic("out of oids");
  128         }
  129 #if 0
  130         else if (oidp->oid_number >= CTL_AUTO_START) {
  131                 /* do not panic; this happens when unregistering sysctl sets */
  132                 printf("static sysctl oid too high: %d", oidp->oid_number);
  133         }
  134 #endif
  135 
  136         /*
  137          * Insert the oid into the parent's list in order.
  138          */
  139         q = NULL;
  140         SLIST_FOREACH(p, parent, oid_link) {
  141                 if (oidp->oid_number < p->oid_number)
  142                         break;
  143                 q = p;
  144         }
  145         if (q)
  146                 SLIST_INSERT_AFTER(q, oidp, oid_link);
  147         else
  148                 SLIST_INSERT_HEAD(parent, oidp, oid_link);
  149 }
  150 
  151 void
  152 sysctl_unregister_oid(struct sysctl_oid *oidp)
  153 {
  154         struct sysctl_oid *p;
  155         int error;
  156 
  157         error = ENOENT;
  158         if (oidp->oid_number == OID_AUTO) {
  159                 error = EINVAL;
  160         } else {
  161                 SLIST_FOREACH(p, oidp->oid_parent, oid_link) {
  162                         if (p == oidp) {
  163                                 SLIST_REMOVE(oidp->oid_parent, oidp,
  164                                     sysctl_oid, oid_link);
  165                                 error = 0;
  166                                 break;
  167                         }
  168                 }
  169         }
  170 
  171         /* 
  172          * This can happen when a module fails to register and is
  173          * being unloaded afterwards.  It should not be a panic()
  174          * for normal use.
  175          */
  176         if (error)
  177                 printf("%s: failed to unregister sysctl\n", __func__);
  178 }
  179 
  180 /* Initialize a new context to keep track of dynamically added sysctls. */
  181 int
  182 sysctl_ctx_init(struct sysctl_ctx_list *c)
  183 {
  184 
  185         if (c == NULL) {
  186                 return (EINVAL);
  187         }
  188         TAILQ_INIT(c);
  189         return (0);
  190 }
  191 
  192 /* Free the context, and destroy all dynamic oids registered in this context */
  193 int
  194 sysctl_ctx_free(struct sysctl_ctx_list *clist)
  195 {
  196         struct sysctl_ctx_entry *e, *e1;
  197         int error;
  198 
  199         error = 0;
  200         /*
  201          * First perform a "dry run" to check if it's ok to remove oids.
  202          * XXX FIXME
  203          * XXX This algorithm is a hack. But I don't know any
  204          * XXX better solution for now...
  205          */
  206         TAILQ_FOREACH(e, clist, link) {
  207                 error = sysctl_remove_oid(e->entry, 0, 0);
  208                 if (error)
  209                         break;
  210         }
  211         /*
  212          * Restore deregistered entries, either from the end,
  213          * or from the place where error occured.
  214          * e contains the entry that was not unregistered
  215          */
  216         if (error)
  217                 e1 = TAILQ_PREV(e, sysctl_ctx_list, link);
  218         else
  219                 e1 = TAILQ_LAST(clist, sysctl_ctx_list);
  220         while (e1 != NULL) {
  221                 sysctl_register_oid(e1->entry);
  222                 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link);
  223         }
  224         if (error)
  225                 return(EBUSY);
  226         /* Now really delete the entries */
  227         e = TAILQ_FIRST(clist);
  228         while (e != NULL) {
  229                 e1 = TAILQ_NEXT(e, link);
  230                 error = sysctl_remove_oid(e->entry, 1, 0);
  231                 if (error)
  232                         panic("sysctl_remove_oid: corrupt tree, entry: %s",
  233                             e->entry->oid_name);
  234                 free(e, M_SYSCTLOID);
  235                 e = e1;
  236         }
  237         return (error);
  238 }
  239 
  240 /* Add an entry to the context */
  241 struct sysctl_ctx_entry *
  242 sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
  243 {
  244         struct sysctl_ctx_entry *e;
  245 
  246         if (clist == NULL || oidp == NULL)
  247                 return(NULL);
  248         e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK);
  249         e->entry = oidp;
  250         TAILQ_INSERT_HEAD(clist, e, link);
  251         return (e);
  252 }
  253 
  254 /* Find an entry in the context */
  255 struct sysctl_ctx_entry *
  256 sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
  257 {
  258         struct sysctl_ctx_entry *e;
  259 
  260         if (clist == NULL || oidp == NULL)
  261                 return(NULL);
  262         TAILQ_FOREACH(e, clist, link) {
  263                 if(e->entry == oidp)
  264                         return(e);
  265         }
  266         return (e);
  267 }
  268 
  269 /*
  270  * Delete an entry from the context.
  271  * NOTE: this function doesn't free oidp! You have to remove it
  272  * with sysctl_remove_oid().
  273  */
  274 int
  275 sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
  276 {
  277         struct sysctl_ctx_entry *e;
  278 
  279         if (clist == NULL || oidp == NULL)
  280                 return (EINVAL);
  281         e = sysctl_ctx_entry_find(clist, oidp);
  282         if (e != NULL) {
  283                 TAILQ_REMOVE(clist, e, link);
  284                 free(e, M_SYSCTLOID);
  285                 return (0);
  286         } else
  287                 return (ENOENT);
  288 }
  289 
  290 /*
  291  * Remove dynamically created sysctl trees.
  292  * oidp - top of the tree to be removed
  293  * del - if 0 - just deregister, otherwise free up entries as well
  294  * recurse - if != 0 traverse the subtree to be deleted
  295  */
  296 int
  297 sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse)
  298 {
  299         struct sysctl_oid *p;
  300         int error;
  301 
  302         if (oidp == NULL)
  303                 return(EINVAL);
  304         if ((oidp->oid_kind & CTLFLAG_DYN) == 0) {
  305                 printf("can't remove non-dynamic nodes!\n");
  306                 return (EINVAL);
  307         }
  308         /*
  309          * WARNING: normal method to do this should be through
  310          * sysctl_ctx_free(). Use recursing as the last resort
  311          * method to purge your sysctl tree of leftovers...
  312          * However, if some other code still references these nodes,
  313          * it will panic.
  314          */
  315         if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
  316                 if (oidp->oid_refcnt == 1) {
  317                         SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) {
  318                                 if (!recurse)
  319                                         return (ENOTEMPTY);
  320                                 error = sysctl_remove_oid(p, del, recurse);
  321                                 if (error)
  322                                         return (error);
  323                         }
  324                         if (del)
  325                                 free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID);
  326                 }
  327         }
  328         if (oidp->oid_refcnt > 1 ) {
  329                 oidp->oid_refcnt--;
  330         } else {
  331                 if (oidp->oid_refcnt == 0) {
  332                         printf("Warning: bad oid_refcnt=%u (%s)!\n",
  333                                 oidp->oid_refcnt, oidp->oid_name);
  334                         return (EINVAL);
  335                 }
  336                 sysctl_unregister_oid(oidp);
  337                 if (del) {
  338                         if (oidp->oid_descr)
  339                                 free((void *)(uintptr_t)(const void *)oidp->oid_descr, M_SYSCTLOID);
  340                         free((void *)(uintptr_t)(const void *)oidp->oid_name,
  341                              M_SYSCTLOID);
  342                         free(oidp, M_SYSCTLOID);
  343                 }
  344         }
  345         return (0);
  346 }
  347 
  348 /*
  349  * Create new sysctls at run time.
  350  * clist may point to a valid context initialized with sysctl_ctx_init().
  351  */
  352 struct sysctl_oid *
  353 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent,
  354         int number, const char *name, int kind, void *arg1, int arg2,
  355         int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr)
  356 {
  357         struct sysctl_oid *oidp;
  358         ssize_t len;
  359         char *newname;
  360 
  361         /* You have to hook up somewhere.. */
  362         if (parent == NULL)
  363                 return(NULL);
  364         /* Check if the node already exists, otherwise create it */
  365         oidp = sysctl_find_oidname(name, parent);
  366         if (oidp != NULL) {
  367                 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
  368                         oidp->oid_refcnt++;
  369                         /* Update the context */
  370                         if (clist != NULL)
  371                                 sysctl_ctx_entry_add(clist, oidp);
  372                         return (oidp);
  373                 } else {
  374                         printf("can't re-use a leaf (%s)!\n", name);
  375                         return (NULL);
  376                 }
  377         }
  378         oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO);
  379         oidp->oid_parent = parent;
  380         SLIST_NEXT(oidp, oid_link) = NULL;
  381         oidp->oid_number = number;
  382         oidp->oid_refcnt = 1;
  383         len = strlen(name);
  384         newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK);
  385         bcopy(name, newname, len + 1);
  386         newname[len] = '\0';
  387         oidp->oid_name = newname;
  388         oidp->oid_handler = handler;
  389         oidp->oid_kind = CTLFLAG_DYN | kind;
  390         if ((kind & CTLTYPE) == CTLTYPE_NODE) {
  391                 /* Allocate space for children */
  392                 SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list),
  393                     M_SYSCTLOID, M_WAITOK));
  394                 SLIST_INIT(SYSCTL_CHILDREN(oidp));
  395         } else {
  396                 oidp->oid_arg1 = arg1;
  397                 oidp->oid_arg2 = arg2;
  398         }
  399         oidp->oid_fmt = fmt;
  400         if (descr) {
  401                 int len = strlen(descr) + 1;
  402                 oidp->oid_descr = malloc(len, M_SYSCTLOID, M_WAITOK);
  403                 if (oidp->oid_descr)
  404                         strcpy((char *)(uintptr_t)(const void *)oidp->oid_descr, descr);
  405         }
  406         /* Update the context, if used */
  407         if (clist != NULL)
  408                 sysctl_ctx_entry_add(clist, oidp);
  409         /* Register this oid */
  410         sysctl_register_oid(oidp);
  411         return (oidp);
  412 }
  413 
  414 /*
  415  * Reparent an existing oid.
  416  */
  417 int
  418 sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent)
  419 {
  420         struct sysctl_oid *oidp;
  421 
  422         if (oid->oid_parent == parent)
  423                 return (0);
  424         oidp = sysctl_find_oidname(oid->oid_name, parent);
  425         if (oidp != NULL)
  426                 return (EEXIST);
  427         sysctl_unregister_oid(oid);
  428         oid->oid_parent = parent;
  429         oid->oid_number = OID_AUTO;
  430         sysctl_register_oid(oid);
  431         return (0);
  432 }
  433 
  434 /*
  435  * Register the kernel's oids on startup.
  436  */
  437 SET_DECLARE(sysctl_set, struct sysctl_oid);
  438 
  439 static void
  440 sysctl_register_all(void *arg)
  441 {
  442         struct sysctl_oid **oidp;
  443 
  444         SYSCTL_INIT();
  445         SET_FOREACH(oidp, sysctl_set)
  446                 sysctl_register_oid(*oidp);
  447 }
  448 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0);
  449 
  450 /*
  451  * "Staff-functions"
  452  *
  453  * These functions implement a presently undocumented interface 
  454  * used by the sysctl program to walk the tree, and get the type
  455  * so it can print the value.
  456  * This interface is under work and consideration, and should probably
  457  * be killed with a big axe by the first person who can find the time.
  458  * (be aware though, that the proper interface isn't as obvious as it
  459  * may seem, there are various conflicting requirements.
  460  *
  461  * {0,0}        printf the entire MIB-tree.
  462  * {0,1,...}    return the name of the "..." OID.
  463  * {0,2,...}    return the next OID.
  464  * {0,3}        return the OID of the name in "new"
  465  * {0,4,...}    return the kind & format info for the "..." OID.
  466  * {0,5,...}    return the description the "..." OID.
  467  */
  468 
  469 #ifdef SYSCTL_DEBUG
  470 static void
  471 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
  472 {
  473         int k;
  474         struct sysctl_oid *oidp;
  475 
  476         SLIST_FOREACH(oidp, l, oid_link) {
  477 
  478                 for (k=0; k<i; k++)
  479                         printf(" ");
  480 
  481                 printf("%d %s ", oidp->oid_number, oidp->oid_name);
  482 
  483                 printf("%c%c",
  484                         oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
  485                         oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
  486 
  487                 if (oidp->oid_handler)
  488                         printf(" *Handler");
  489 
  490                 switch (oidp->oid_kind & CTLTYPE) {
  491                         case CTLTYPE_NODE:
  492                                 printf(" Node\n");
  493                                 if (!oidp->oid_handler) {
  494                                         sysctl_sysctl_debug_dump_node(
  495                                                 oidp->oid_arg1, i+2);
  496                                 }
  497                                 break;
  498                         case CTLTYPE_INT:    printf(" Int\n"); break;
  499                         case CTLTYPE_STRING: printf(" String\n"); break;
  500                         case CTLTYPE_QUAD:   printf(" Quad\n"); break;
  501                         case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
  502                         default:             printf("\n");
  503                 }
  504 
  505         }
  506 }
  507 
  508 static int
  509 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS)
  510 {
  511         int error;
  512 
  513         error = suser(req->td);
  514         if (error)
  515                 return (error);
  516         sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
  517         return (ENOENT);
  518 }
  519 
  520 SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD,
  521         0, 0, sysctl_sysctl_debug, "-", "");
  522 #endif
  523 
  524 static int
  525 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS)
  526 {
  527         int *name = (int *) arg1;
  528         u_int namelen = arg2;
  529         int error = 0;
  530         struct sysctl_oid *oid;
  531         struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
  532         char buf[10];
  533 
  534         while (namelen) {
  535                 if (!lsp) {
  536                         snprintf(buf,sizeof(buf),"%d",*name);
  537                         if (req->oldidx)
  538                                 error = SYSCTL_OUT(req, ".", 1);
  539                         if (!error)
  540                                 error = SYSCTL_OUT(req, buf, strlen(buf));
  541                         if (error)
  542                                 return (error);
  543                         namelen--;
  544                         name++;
  545                         continue;
  546                 }
  547                 lsp2 = 0;
  548                 SLIST_FOREACH(oid, lsp, oid_link) {
  549                         if (oid->oid_number != *name)
  550                                 continue;
  551 
  552                         if (req->oldidx)
  553                                 error = SYSCTL_OUT(req, ".", 1);
  554                         if (!error)
  555                                 error = SYSCTL_OUT(req, oid->oid_name,
  556                                         strlen(oid->oid_name));
  557                         if (error)
  558                                 return (error);
  559 
  560                         namelen--;
  561                         name++;
  562 
  563                         if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 
  564                                 break;
  565 
  566                         if (oid->oid_handler)
  567                                 break;
  568 
  569                         lsp2 = (struct sysctl_oid_list *)oid->oid_arg1;
  570                         break;
  571                 }
  572                 lsp = lsp2;
  573         }
  574         return (SYSCTL_OUT(req, "", 1));
  575 }
  576 
  577 static SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, "");
  578 
  579 static int
  580 sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 
  581         int *next, int *len, int level, struct sysctl_oid **oidpp)
  582 {
  583         struct sysctl_oid *oidp;
  584 
  585         *len = level;
  586         SLIST_FOREACH(oidp, lsp, oid_link) {
  587                 *next = oidp->oid_number;
  588                 *oidpp = oidp;
  589 
  590                 if (oidp->oid_kind & CTLFLAG_SKIP)
  591                         continue;
  592 
  593                 if (!namelen) {
  594                         if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 
  595                                 return (0);
  596                         if (oidp->oid_handler) 
  597                                 /* We really should call the handler here...*/
  598                                 return (0);
  599                         lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  600                         if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 
  601                                 len, level+1, oidpp))
  602                                 return (0);
  603                         goto emptynode;
  604                 }
  605 
  606                 if (oidp->oid_number < *name)
  607                         continue;
  608 
  609                 if (oidp->oid_number > *name) {
  610                         if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
  611                                 return (0);
  612                         if (oidp->oid_handler)
  613                                 return (0);
  614                         lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  615                         if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 
  616                                 next+1, len, level+1, oidpp))
  617                                 return (0);
  618                         goto next;
  619                 }
  620                 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
  621                         continue;
  622 
  623                 if (oidp->oid_handler)
  624                         continue;
  625 
  626                 lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  627                 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 
  628                         len, level+1, oidpp))
  629                         return (0);
  630         next:
  631                 namelen = 1;
  632         emptynode:
  633                 *len = level;
  634         }
  635         return (1);
  636 }
  637 
  638 static int
  639 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS)
  640 {
  641         int *name = (int *) arg1;
  642         u_int namelen = arg2;
  643         int i, j, error;
  644         struct sysctl_oid *oid;
  645         struct sysctl_oid_list *lsp = &sysctl__children;
  646         int newoid[CTL_MAXNAME];
  647 
  648         i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid);
  649         if (i)
  650                 return (ENOENT);
  651         error = SYSCTL_OUT(req, newoid, j * sizeof (int));
  652         return (error);
  653 }
  654 
  655 static SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, "");
  656 
  657 static int
  658 name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp)
  659 {
  660         int i;
  661         struct sysctl_oid *oidp;
  662         struct sysctl_oid_list *lsp = &sysctl__children;
  663         char *p;
  664 
  665         if (!*name)
  666                 return (ENOENT);
  667 
  668         p = name + strlen(name) - 1 ;
  669         if (*p == '.')
  670                 *p = '\0';
  671 
  672         *len = 0;
  673 
  674         for (p = name; *p && *p != '.'; p++) 
  675                 ;
  676         i = *p;
  677         if (i == '.')
  678                 *p = '\0';
  679 
  680         oidp = SLIST_FIRST(lsp);
  681 
  682         while (oidp && *len < CTL_MAXNAME) {
  683                 if (strcmp(name, oidp->oid_name)) {
  684                         oidp = SLIST_NEXT(oidp, oid_link);
  685                         continue;
  686                 }
  687                 *oid++ = oidp->oid_number;
  688                 (*len)++;
  689 
  690                 if (!i) {
  691                         if (oidpp)
  692                                 *oidpp = oidp;
  693                         return (0);
  694                 }
  695 
  696                 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
  697                         break;
  698 
  699                 if (oidp->oid_handler)
  700                         break;
  701 
  702                 lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  703                 oidp = SLIST_FIRST(lsp);
  704                 name = p+1;
  705                 for (p = name; *p && *p != '.'; p++) 
  706                                 ;
  707                 i = *p;
  708                 if (i == '.')
  709                         *p = '\0';
  710         }
  711         return (ENOENT);
  712 }
  713 
  714 static int
  715 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS)
  716 {
  717         char *p;
  718         int error, oid[CTL_MAXNAME], len;
  719         struct sysctl_oid *op = 0;
  720 
  721         if (!req->newlen) 
  722                 return (ENOENT);
  723         if (req->newlen >= MAXPATHLEN)  /* XXX arbitrary, undocumented */
  724                 return (ENAMETOOLONG);
  725 
  726         p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK);
  727 
  728         error = SYSCTL_IN(req, p, req->newlen);
  729         if (error) {
  730                 free(p, M_SYSCTL);
  731                 return (error);
  732         }
  733 
  734         p [req->newlen] = '\0';
  735 
  736         error = name2oid(p, oid, &len, &op);
  737 
  738         free(p, M_SYSCTL);
  739 
  740         if (error)
  741                 return (error);
  742 
  743         error = SYSCTL_OUT(req, oid, len * sizeof *oid);
  744         return (error);
  745 }
  746 
  747 SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, 
  748         sysctl_sysctl_name2oid, "I", "");
  749 
  750 static int
  751 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS)
  752 {
  753         struct sysctl_oid *oid;
  754         int error;
  755 
  756         error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
  757         if (error)
  758                 return (error);
  759 
  760         if (!oid->oid_fmt)
  761                 return (ENOENT);
  762         error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind));
  763         if (error)
  764                 return (error);
  765         error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1);
  766         return (error);
  767 }
  768 
  769 
  770 static SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, "");
  771 
  772 static int
  773 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS)
  774 {
  775         struct sysctl_oid *oid;
  776         int error;
  777 
  778         error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
  779         if (error)
  780                 return (error);
  781 
  782         if (!oid->oid_descr)
  783                 return (ENOENT);
  784         error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1);
  785         return (error);
  786 }
  787 
  788 static SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, "");
  789 
  790 /*
  791  * Default "handler" functions.
  792  */
  793 
  794 /*
  795  * Handle an int, signed or unsigned.
  796  * Two cases:
  797  *     a variable:  point arg1 at it.
  798  *     a constant:  pass it in arg2.
  799  */
  800 
  801 int
  802 sysctl_handle_int(SYSCTL_HANDLER_ARGS)
  803 {
  804         int tmpout, error = 0;
  805 
  806         /*
  807          * Attempt to get a coherent snapshot by making a copy of the data.
  808          */
  809         if (arg1)
  810                 tmpout = *(int *)arg1;
  811         else
  812                 tmpout = arg2;
  813         error = SYSCTL_OUT(req, &tmpout, sizeof(int));
  814 
  815         if (error || !req->newptr)
  816                 return (error);
  817 
  818         if (!arg1)
  819                 error = EPERM;
  820         else
  821                 error = SYSCTL_IN(req, arg1, sizeof(int));
  822         return (error);
  823 }
  824 
  825 
  826 /*
  827  * Based on on sysctl_handle_int() convert milliseconds into ticks.
  828  */
  829 
  830 int
  831 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
  832 {
  833         int error, s, tt;
  834 
  835         tt = *(int *)oidp->oid_arg1;
  836         s = (int)((int64_t)tt * 1000 / hz);
  837 
  838         error = sysctl_handle_int(oidp, &s, 0, req);
  839         if (error || !req->newptr)
  840                 return (error);
  841 
  842         tt = (int)((int64_t)s * hz / 1000);
  843         if (tt < 1)
  844                 return (EINVAL);
  845 
  846         *(int *)oidp->oid_arg1 = tt;
  847         return (0);
  848 }
  849 
  850 
  851 /*
  852  * Handle a long, signed or unsigned.  arg1 points to it.
  853  */
  854 
  855 int
  856 sysctl_handle_long(SYSCTL_HANDLER_ARGS)
  857 {
  858         int error = 0;
  859         long tmplong;
  860 #ifdef SCTL_MASK32
  861         int tmpint;
  862 #endif
  863 
  864         /*
  865          * Attempt to get a coherent snapshot by making a copy of the data.
  866          */
  867         if (!arg1)
  868                 return (EINVAL);
  869         tmplong = *(long *)arg1;
  870 #ifdef SCTL_MASK32
  871         if (req->flags & SCTL_MASK32) {
  872                 tmpint = tmplong;
  873                 error = SYSCTL_OUT(req, &tmpint, sizeof(int));
  874         } else
  875 #endif
  876                 error = SYSCTL_OUT(req, &tmplong, sizeof(long));
  877 
  878         if (error || !req->newptr)
  879                 return (error);
  880 
  881 #ifdef SCTL_MASK32
  882         if (req->flags & SCTL_MASK32) {
  883                 error = SYSCTL_IN(req, &tmpint, sizeof(int));
  884                 *(long *)arg1 = (long)tmpint;
  885         } else
  886 #endif
  887                 error = SYSCTL_IN(req, arg1, sizeof(long));
  888         return (error);
  889 }
  890 
  891 /*
  892  * Handle our generic '\0' terminated 'C' string.
  893  * Two cases:
  894  *      a variable string:  point arg1 at it, arg2 is max length.
  895  *      a constant string:  point arg1 at it, arg2 is zero.
  896  */
  897 
  898 int
  899 sysctl_handle_string(SYSCTL_HANDLER_ARGS)
  900 {
  901         int error=0;
  902         char *tmparg;
  903         size_t outlen;
  904 
  905         /*
  906          * Attempt to get a coherent snapshot by copying to a
  907          * temporary kernel buffer.
  908          */
  909 retry:
  910         outlen = strlen((char *)arg1)+1;
  911         tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK);
  912 
  913         if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) {
  914                 free(tmparg, M_SYSCTLTMP);
  915                 goto retry;
  916         }
  917 
  918         error = SYSCTL_OUT(req, tmparg, outlen);
  919         free(tmparg, M_SYSCTLTMP);
  920 
  921         if (error || !req->newptr)
  922                 return (error);
  923 
  924         if ((req->newlen - req->newidx) >= arg2) {
  925                 error = EINVAL;
  926         } else {
  927                 arg2 = (req->newlen - req->newidx);
  928                 error = SYSCTL_IN(req, arg1, arg2);
  929                 ((char *)arg1)[arg2] = '\0';
  930         }
  931 
  932         return (error);
  933 }
  934 
  935 /*
  936  * Handle any kind of opaque data.
  937  * arg1 points to it, arg2 is the size.
  938  */
  939 
  940 int
  941 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
  942 {
  943         int error, tries;
  944         u_int generation;
  945         struct sysctl_req req2;
  946 
  947         /*
  948          * Attempt to get a coherent snapshot, by using the thread
  949          * pre-emption counter updated from within mi_switch() to
  950          * determine if we were pre-empted during a bcopy() or
  951          * copyout(). Make 3 attempts at doing this before giving up.
  952          * If we encounter an error, stop immediately.
  953          */
  954         tries = 0;
  955         req2 = *req;
  956 retry:
  957         generation = curthread->td_generation;
  958         error = SYSCTL_OUT(req, arg1, arg2);
  959         if (error)
  960                 return (error);
  961         tries++;
  962         if (generation != curthread->td_generation && tries < 3) {
  963                 *req = req2;
  964                 goto retry;
  965         }
  966 
  967         error = SYSCTL_IN(req, arg1, arg2);
  968 
  969         return (error);
  970 }
  971 
  972 /*
  973  * Transfer functions to/from kernel space.
  974  * XXX: rather untested at this point
  975  */
  976 static int
  977 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
  978 {
  979         size_t i = 0;
  980 
  981         if (req->oldptr) {
  982                 i = l;
  983                 if (req->oldlen <= req->oldidx)
  984                         i = 0;
  985                 else
  986                         if (i > req->oldlen - req->oldidx)
  987                                 i = req->oldlen - req->oldidx;
  988                 if (i > 0)
  989                         bcopy(p, (char *)req->oldptr + req->oldidx, i);
  990         }
  991         req->oldidx += l;
  992         if (req->oldptr && i != l)
  993                 return (ENOMEM);
  994         return (0);
  995 }
  996 
  997 static int
  998 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
  999 {
 1000         if (!req->newptr)
 1001                 return (0);
 1002         if (req->newlen - req->newidx < l)
 1003                 return (EINVAL);
 1004         bcopy((char *)req->newptr + req->newidx, p, l);
 1005         req->newidx += l;
 1006         return (0);
 1007 }
 1008 
 1009 int
 1010 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
 1011     size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags)
 1012 {
 1013         int error = 0;
 1014         struct sysctl_req req;
 1015 
 1016         bzero(&req, sizeof req);
 1017 
 1018         req.td = td;
 1019         req.flags = flags;
 1020 
 1021         if (oldlenp) {
 1022                 req.oldlen = *oldlenp;
 1023         }
 1024         req.validlen = req.oldlen;
 1025 
 1026         if (old) {
 1027                 req.oldptr= old;
 1028         }
 1029 
 1030         if (new != NULL) {
 1031                 req.newlen = newlen;
 1032                 req.newptr = new;
 1033         }
 1034 
 1035         req.oldfunc = sysctl_old_kernel;
 1036         req.newfunc = sysctl_new_kernel;
 1037         req.lock = REQ_LOCKED;
 1038 
 1039         SYSCTL_LOCK();
 1040 
 1041         error = sysctl_root(0, name, namelen, &req);
 1042 
 1043         if (req.lock == REQ_WIRED && req.validlen > 0)
 1044                 vsunlock(req.oldptr, req.validlen);
 1045 
 1046         SYSCTL_UNLOCK();
 1047 
 1048         if (error && error != ENOMEM)
 1049                 return (error);
 1050 
 1051         if (retval) {
 1052                 if (req.oldptr && req.oldidx > req.validlen)
 1053                         *retval = req.validlen;
 1054                 else
 1055                         *retval = req.oldidx;
 1056         }
 1057         return (error);
 1058 }
 1059 
 1060 int
 1061 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp,
 1062     void *new, size_t newlen, size_t *retval, int flags)
 1063 {
 1064         int oid[CTL_MAXNAME];
 1065         size_t oidlen, plen;
 1066         int error;
 1067 
 1068         oid[0] = 0;             /* sysctl internal magic */
 1069         oid[1] = 3;             /* name2oid */
 1070         oidlen = sizeof(oid);
 1071 
 1072         error = kernel_sysctl(td, oid, 2, oid, &oidlen,
 1073             (void *)name, strlen(name), &plen, flags);
 1074         if (error)
 1075                 return (error);
 1076 
 1077         error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp,
 1078             new, newlen, retval, flags);
 1079         return (error);
 1080 }
 1081 
 1082 /*
 1083  * Transfer function to/from user space.
 1084  */
 1085 static int
 1086 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
 1087 {
 1088         int error = 0;
 1089         size_t i, len, origidx;
 1090 
 1091         origidx = req->oldidx;
 1092         req->oldidx += l;
 1093         if (req->oldptr == NULL)
 1094                 return (0);
 1095         /*
 1096          * If we have not wired the user supplied buffer and we are currently
 1097          * holding locks, drop a witness warning, as it's possible that
 1098          * write operations to the user page can sleep.
 1099          */
 1100         if (req->lock != REQ_WIRED)
 1101                 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
 1102                     "sysctl_old_user()");
 1103         i = l;
 1104         len = req->validlen;
 1105         if (len <= origidx)
 1106                 i = 0;
 1107         else {
 1108                 if (i > len - origidx)
 1109                         i = len - origidx;
 1110                 error = copyout(p, (char *)req->oldptr + origidx, i);
 1111         }
 1112         if (error)
 1113                 return (error);
 1114         if (i < l)
 1115                 return (ENOMEM);
 1116         return (0);
 1117 }
 1118 
 1119 static int
 1120 sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
 1121 {
 1122         int error;
 1123 
 1124         if (!req->newptr)
 1125                 return (0);
 1126         if (req->newlen - req->newidx < l)
 1127                 return (EINVAL);
 1128         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
 1129             "sysctl_new_user()");
 1130         error = copyin((char *)req->newptr + req->newidx, p, l);
 1131         req->newidx += l;
 1132         return (error);
 1133 }
 1134 
 1135 /*
 1136  * Wire the user space destination buffer.  If set to a value greater than
 1137  * zero, the len parameter limits the maximum amount of wired memory.
 1138  */
 1139 int
 1140 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len)
 1141 {
 1142         int ret;
 1143         size_t i, wiredlen;
 1144         char *cp, dummy;
 1145 
 1146         wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen;
 1147         ret = 0;
 1148         if (req->lock == REQ_LOCKED && req->oldptr &&
 1149             req->oldfunc == sysctl_old_user) {
 1150                 if (wiredlen != 0) {
 1151                         ret = vslock(req->oldptr, wiredlen);
 1152                         if (ret != 0) {
 1153                                 if (ret != ENOMEM)
 1154                                         return (ret);
 1155                                 wiredlen = 0;
 1156                         }
 1157                         /*
 1158                          * Touch all the wired pages to avoid PTE modified
 1159                          * bit emulation traps on Alpha while holding locks
 1160                          * in the sysctl handler.
 1161                          */
 1162                         for (i = (wiredlen + PAGE_SIZE - 1) / PAGE_SIZE,
 1163                             cp = req->oldptr; i > 0; i--, cp += PAGE_SIZE) {
 1164                                 copyin(cp, &dummy, 1);
 1165                                 copyout(&dummy, cp, 1);
 1166                         }
 1167                 }
 1168                 req->lock = REQ_WIRED;
 1169                 req->validlen = wiredlen;
 1170         }
 1171         return (0);
 1172 }
 1173 
 1174 int
 1175 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
 1176     int *nindx, struct sysctl_req *req)
 1177 {
 1178         struct sysctl_oid *oid;
 1179         int indx;
 1180 
 1181         oid = SLIST_FIRST(&sysctl__children);
 1182         indx = 0;
 1183         while (oid && indx < CTL_MAXNAME) {
 1184                 if (oid->oid_number == name[indx]) {
 1185                         indx++;
 1186                         if (oid->oid_kind & CTLFLAG_NOLOCK)
 1187                                 req->lock = REQ_UNLOCKED;
 1188                         if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
 1189                                 if (oid->oid_handler != NULL ||
 1190                                     indx == namelen) {
 1191                                         *noid = oid;
 1192                                         if (nindx != NULL)
 1193                                                 *nindx = indx;
 1194                                         return (0);
 1195                                 }
 1196                                 oid = SLIST_FIRST(
 1197                                     (struct sysctl_oid_list *)oid->oid_arg1);
 1198                         } else if (indx == namelen) {
 1199                                 *noid = oid;
 1200                                 if (nindx != NULL)
 1201                                         *nindx = indx;
 1202                                 return (0);
 1203                         } else {
 1204                                 return (ENOTDIR);
 1205                         }
 1206                 } else {
 1207                         oid = SLIST_NEXT(oid, oid_link);
 1208                 }
 1209         }
 1210         return (ENOENT);
 1211 }
 1212 
 1213 /*
 1214  * Traverse our tree, and find the right node, execute whatever it points
 1215  * to, and return the resulting error code.
 1216  */
 1217 
 1218 static int
 1219 sysctl_root(SYSCTL_HANDLER_ARGS)
 1220 {
 1221         struct sysctl_oid *oid;
 1222         int error, indx, lvl;
 1223 
 1224         error = sysctl_find_oid(arg1, arg2, &oid, &indx, req);
 1225         if (error)
 1226                 return (error);
 1227 
 1228         if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
 1229                 /*
 1230                  * You can't call a sysctl when it's a node, but has
 1231                  * no handler.  Inform the user that it's a node.
 1232                  * The indx may or may not be the same as namelen.
 1233                  */
 1234                 if (oid->oid_handler == NULL)
 1235                         return (EISDIR);
 1236         }
 1237 
 1238         /* Is this sysctl writable? */
 1239         if (req->newptr && !(oid->oid_kind & CTLFLAG_WR))
 1240                 return (EPERM);
 1241 
 1242         KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL"));
 1243 
 1244         /* Is this sysctl sensitive to securelevels? */
 1245         if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) {
 1246                 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE;
 1247                 error = securelevel_gt(req->td->td_ucred, lvl);
 1248                 if (error)
 1249                         return (error);
 1250         }
 1251 
 1252         /* Is this sysctl writable by only privileged users? */
 1253         if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) {
 1254                 int flags;
 1255 
 1256                 if (oid->oid_kind & CTLFLAG_PRISON)
 1257                         flags = SUSER_ALLOWJAIL;
 1258                 else
 1259                         flags = 0;
 1260                 error = suser_cred(req->td->td_ucred, flags);
 1261                 if (error)
 1262                         return (error);
 1263         }
 1264 
 1265         if (!oid->oid_handler)
 1266                 return (EINVAL);
 1267 
 1268         if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
 1269                 arg1 = (int *)arg1 + indx;
 1270                 arg2 -= indx;
 1271         } else {
 1272                 arg1 = oid->oid_arg1;
 1273                 arg2 = oid->oid_arg2;
 1274         }
 1275 #ifdef MAC
 1276         error = mac_check_system_sysctl(req->td->td_ucred, oid, arg1, arg2,
 1277             req);
 1278         if (error != 0)
 1279                 return (error);
 1280 #endif
 1281         error = oid->oid_handler(oid, arg1, arg2, req);
 1282 
 1283         return (error);
 1284 }
 1285 
 1286 #ifndef _SYS_SYSPROTO_H_
 1287 struct sysctl_args {
 1288         int     *name;
 1289         u_int   namelen;
 1290         void    *old;
 1291         size_t  *oldlenp;
 1292         void    *new;
 1293         size_t  newlen;
 1294 };
 1295 #endif
 1296 
 1297 /*
 1298  * MPSAFE
 1299  */
 1300 int
 1301 __sysctl(struct thread *td, struct sysctl_args *uap)
 1302 {
 1303         int error, name[CTL_MAXNAME];
 1304         size_t j;
 1305 
 1306         if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
 1307                 return (EINVAL);
 1308 
 1309         error = copyin(uap->name, &name, uap->namelen * sizeof(int));
 1310         if (error)
 1311                 return (error);
 1312 
 1313         mtx_lock(&Giant);
 1314 
 1315         error = userland_sysctl(td, name, uap->namelen,
 1316                 uap->old, uap->oldlenp, 0,
 1317                 uap->new, uap->newlen, &j, 0);
 1318         if (error && error != ENOMEM)
 1319                 goto done2;
 1320         if (uap->oldlenp) {
 1321                 int i = copyout(&j, uap->oldlenp, sizeof(j));
 1322                 if (i)
 1323                         error = i;
 1324         }
 1325 done2:
 1326         mtx_unlock(&Giant);
 1327         return (error);
 1328 }
 1329 
 1330 /*
 1331  * This is used from various compatibility syscalls too.  That's why name
 1332  * must be in kernel space.
 1333  */
 1334 int
 1335 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
 1336     size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval,
 1337     int flags)
 1338 {
 1339         int error = 0;
 1340         struct sysctl_req req;
 1341 
 1342         bzero(&req, sizeof req);
 1343 
 1344         req.td = td;
 1345         req.flags = flags;
 1346 
 1347         if (oldlenp) {
 1348                 if (inkernel) {
 1349                         req.oldlen = *oldlenp;
 1350                 } else {
 1351                         error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp));
 1352                         if (error)
 1353                                 return (error);
 1354                 }
 1355         }
 1356         req.validlen = req.oldlen;
 1357 
 1358         if (old) {
 1359                 if (!useracc(old, req.oldlen, VM_PROT_WRITE))
 1360                         return (EFAULT);
 1361                 req.oldptr= old;
 1362         }
 1363 
 1364         if (new != NULL) {
 1365                 if (!useracc(new, req.newlen, VM_PROT_READ))
 1366                         return (EFAULT);
 1367                 req.newlen = newlen;
 1368                 req.newptr = new;
 1369         }
 1370 
 1371         req.oldfunc = sysctl_old_user;
 1372         req.newfunc = sysctl_new_user;
 1373         req.lock = REQ_LOCKED;
 1374 
 1375         SYSCTL_LOCK();
 1376 
 1377         do {
 1378                 req.oldidx = 0;
 1379                 req.newidx = 0;
 1380                 error = sysctl_root(0, name, namelen, &req);
 1381         } while (error == EAGAIN);
 1382 
 1383         if (req.lock == REQ_WIRED && req.validlen > 0)
 1384                 vsunlock(req.oldptr, req.validlen);
 1385 
 1386         SYSCTL_UNLOCK();
 1387 
 1388         if (error && error != ENOMEM)
 1389                 return (error);
 1390 
 1391         if (retval) {
 1392                 if (req.oldptr && req.oldidx > req.validlen)
 1393                         *retval = req.validlen;
 1394                 else
 1395                         *retval = req.oldidx;
 1396         }
 1397         return (error);
 1398 }
 1399 
 1400 #ifdef COMPAT_43
 1401 #include <sys/socket.h>
 1402 #include <vm/vm_param.h>
 1403 
 1404 #define KINFO_PROC              (0<<8)
 1405 #define KINFO_RT                (1<<8)
 1406 #define KINFO_VNODE             (2<<8)
 1407 #define KINFO_FILE              (3<<8)
 1408 #define KINFO_METER             (4<<8)
 1409 #define KINFO_LOADAVG           (5<<8)
 1410 #define KINFO_CLOCKRATE         (6<<8)
 1411 
 1412 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
 1413 #define KINFO_BSDI_SYSINFO      (101<<8)
 1414 
 1415 /*
 1416  * XXX this is bloat, but I hope it's better here than on the potentially
 1417  * limited kernel stack...  -Peter
 1418  */
 1419 
 1420 static struct {
 1421         int     bsdi_machine;           /* "i386" on BSD/386 */
 1422 /*      ^^^ this is an offset to the string, relative to the struct start */
 1423         char    *pad0;
 1424         long    pad1;
 1425         long    pad2;
 1426         long    pad3;
 1427         u_long  pad4;
 1428         u_long  pad5;
 1429         u_long  pad6;
 1430 
 1431         int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
 1432         int     bsdi_osrelease;         /* "1.1" on BSD/386 */
 1433         long    pad7;
 1434         long    pad8;
 1435         char    *pad9;
 1436 
 1437         long    pad10;
 1438         long    pad11;
 1439         int     pad12;
 1440         long    pad13;
 1441         quad_t  pad14;
 1442         long    pad15;
 1443 
 1444         struct  timeval pad16;
 1445         /* we dont set this, because BSDI's uname used gethostname() instead */
 1446         int     bsdi_hostname;          /* hostname on BSD/386 */
 1447 
 1448         /* the actual string data is appended here */
 1449 
 1450 } bsdi_si;
 1451 /*
 1452  * this data is appended to the end of the bsdi_si structure during copyout.
 1453  * The "char *" offsets are relative to the base of the bsdi_si struct.
 1454  * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
 1455  * should not exceed the length of the buffer here... (or else!! :-)
 1456  */
 1457 static char bsdi_strings[80];   /* It had better be less than this! */
 1458 
 1459 #ifndef _SYS_SYSPROTO_H_
 1460 struct getkerninfo_args {
 1461         int     op;
 1462         char    *where;
 1463         size_t  *size;
 1464         int     arg;
 1465 };
 1466 #endif
 1467 
 1468 /*
 1469  * MPSAFE
 1470  */
 1471 int
 1472 ogetkerninfo(struct thread *td, struct getkerninfo_args *uap)
 1473 {
 1474         int error, name[6];
 1475         size_t size;
 1476         u_int needed = 0;
 1477 
 1478         mtx_lock(&Giant);
 1479 
 1480         switch (uap->op & 0xff00) {
 1481 
 1482         case KINFO_RT:
 1483                 name[0] = CTL_NET;
 1484                 name[1] = PF_ROUTE;
 1485                 name[2] = 0;
 1486                 name[3] = (uap->op & 0xff0000) >> 16;
 1487                 name[4] = uap->op & 0xff;
 1488                 name[5] = uap->arg;
 1489                 error = userland_sysctl(td, name, 6, uap->where, uap->size,
 1490                         0, 0, 0, &size, 0);
 1491                 break;
 1492 
 1493         case KINFO_VNODE:
 1494                 name[0] = CTL_KERN;
 1495                 name[1] = KERN_VNODE;
 1496                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1497                         0, 0, 0, &size, 0);
 1498                 break;
 1499 
 1500         case KINFO_PROC:
 1501                 name[0] = CTL_KERN;
 1502                 name[1] = KERN_PROC;
 1503                 name[2] = uap->op & 0xff;
 1504                 name[3] = uap->arg;
 1505                 error = userland_sysctl(td, name, 4, uap->where, uap->size,
 1506                         0, 0, 0, &size, 0);
 1507                 break;
 1508 
 1509         case KINFO_FILE:
 1510                 name[0] = CTL_KERN;
 1511                 name[1] = KERN_FILE;
 1512                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1513                         0, 0, 0, &size, 0);
 1514                 break;
 1515 
 1516         case KINFO_METER:
 1517                 name[0] = CTL_VM;
 1518                 name[1] = VM_TOTAL;
 1519                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1520                         0, 0, 0, &size, 0);
 1521                 break;
 1522 
 1523         case KINFO_LOADAVG:
 1524                 name[0] = CTL_VM;
 1525                 name[1] = VM_LOADAVG;
 1526                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1527                         0, 0, 0, &size, 0);
 1528                 break;
 1529 
 1530         case KINFO_CLOCKRATE:
 1531                 name[0] = CTL_KERN;
 1532                 name[1] = KERN_CLOCKRATE;
 1533                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1534                         0, 0, 0, &size, 0);
 1535                 break;
 1536 
 1537         case KINFO_BSDI_SYSINFO: {
 1538                 /*
 1539                  * this is pretty crude, but it's just enough for uname()
 1540                  * from BSDI's 1.x libc to work.
 1541                  *
 1542                  * *size gives the size of the buffer before the call, and
 1543                  * the amount of data copied after a successful call.
 1544                  * If successful, the return value is the amount of data
 1545                  * available, which can be larger than *size.
 1546                  *
 1547                  * BSDI's 2.x product apparently fails with ENOMEM if *size
 1548                  * is too small.
 1549                  */
 1550 
 1551                 u_int left;
 1552                 char *s;
 1553 
 1554                 bzero((char *)&bsdi_si, sizeof(bsdi_si));
 1555                 bzero(bsdi_strings, sizeof(bsdi_strings));
 1556 
 1557                 s = bsdi_strings;
 1558 
 1559                 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
 1560                 strcpy(s, ostype);
 1561                 s += strlen(s) + 1;
 1562 
 1563                 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
 1564                 strcpy(s, osrelease);
 1565                 s += strlen(s) + 1;
 1566 
 1567                 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
 1568                 strcpy(s, machine);
 1569                 s += strlen(s) + 1;
 1570 
 1571                 needed = sizeof(bsdi_si) + (s - bsdi_strings);
 1572 
 1573                 if ((uap->where == NULL) || (uap->size == NULL)) {
 1574                         /* process is asking how much buffer to supply.. */
 1575                         size = needed;
 1576                         error = 0;
 1577                         break;
 1578                 }
 1579 
 1580                 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
 1581                         break;
 1582 
 1583                 /* if too much buffer supplied, trim it down */
 1584                 if (size > needed)
 1585                         size = needed;
 1586 
 1587                 /* how much of the buffer is remaining */
 1588                 left = size;
 1589 
 1590                 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
 1591                         break;
 1592 
 1593                 /* is there any point in continuing? */
 1594                 if (left > sizeof(bsdi_si)) {
 1595                         left -= sizeof(bsdi_si);
 1596                         error = copyout(&bsdi_strings,
 1597                                         uap->where + sizeof(bsdi_si), left);
 1598                 }
 1599                 break;
 1600         }
 1601 
 1602         default:
 1603                 error = EOPNOTSUPP;
 1604                 break;
 1605         }
 1606         if (error == 0) {
 1607                 td->td_retval[0] = needed ? needed : size;
 1608                 if (uap->size) {
 1609                         error = copyout(&size, uap->size, sizeof(size));
 1610                 }
 1611         }
 1612         mtx_unlock(&Giant);
 1613         return (error);
 1614 }
 1615 #endif /* COMPAT_43 */

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