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("$FreeBSD$");
   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/malloc.h>
   49 #include <sys/priv.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 
   56 #include <security/mac/mac_framework.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/vm_extern.h>
   60 
   61 static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic");
   62 static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids");
   63 static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer");
   64 
   65 /*
   66  * Locking - this locks the sysctl tree in memory.
   67  */
   68 static struct sx sysctllock;
   69 
   70 #define SYSCTL_LOCK()           sx_xlock(&sysctllock)
   71 #define SYSCTL_UNLOCK()         sx_xunlock(&sysctllock)
   72 #define SYSCTL_INIT()           sx_init(&sysctllock, "sysctl lock")
   73 
   74 static int sysctl_root(SYSCTL_HANDLER_ARGS);
   75 
   76 struct sysctl_oid_list sysctl__children; /* root list */
   77 
   78 static struct sysctl_oid *
   79 sysctl_find_oidname(const char *name, struct sysctl_oid_list *list)
   80 {
   81         struct sysctl_oid *oidp;
   82 
   83         SLIST_FOREACH(oidp, list, oid_link) {
   84                 if (strcmp(oidp->oid_name, name) == 0) {
   85                         return (oidp);
   86                 }
   87         }
   88         return (NULL);
   89 }
   90 
   91 /*
   92  * Initialization of the MIB tree.
   93  *
   94  * Order by number in each list.
   95  */
   96 
   97 void
   98 sysctl_register_oid(struct sysctl_oid *oidp)
   99 {
  100         struct sysctl_oid_list *parent = oidp->oid_parent;
  101         struct sysctl_oid *p;
  102         struct sysctl_oid *q;
  103 
  104         /*
  105          * First check if another oid with the same name already
  106          * exists in the parent's list.
  107          */
  108         p = sysctl_find_oidname(oidp->oid_name, parent);
  109         if (p != NULL) {
  110                 if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
  111                         p->oid_refcnt++;
  112                         return;
  113                 } else {
  114                         printf("can't re-use a leaf (%s)!\n", p->oid_name);
  115                         return;
  116                 }
  117         }
  118         /*
  119          * If this oid has a number OID_AUTO, give it a number which
  120          * is greater than any current oid.
  121          * NOTE: DO NOT change the starting value here, change it in
  122          * <sys/sysctl.h>, and make sure it is at least 256 to
  123          * accomodate e.g. net.inet.raw as a static sysctl node.
  124          */
  125         if (oidp->oid_number == OID_AUTO) {
  126                 static int newoid = CTL_AUTO_START;
  127 
  128                 oidp->oid_number = newoid++;
  129                 if (newoid == 0x7fffffff)
  130                         panic("out of oids");
  131         }
  132 #if 0
  133         else if (oidp->oid_number >= CTL_AUTO_START) {
  134                 /* do not panic; this happens when unregistering sysctl sets */
  135                 printf("static sysctl oid too high: %d", oidp->oid_number);
  136         }
  137 #endif
  138 
  139         /*
  140          * Insert the oid into the parent's list in order.
  141          */
  142         q = NULL;
  143         SLIST_FOREACH(p, parent, oid_link) {
  144                 if (oidp->oid_number < p->oid_number)
  145                         break;
  146                 q = p;
  147         }
  148         if (q)
  149                 SLIST_INSERT_AFTER(q, oidp, oid_link);
  150         else
  151                 SLIST_INSERT_HEAD(parent, oidp, oid_link);
  152 }
  153 
  154 void
  155 sysctl_unregister_oid(struct sysctl_oid *oidp)
  156 {
  157         struct sysctl_oid *p;
  158         int error;
  159 
  160         error = ENOENT;
  161         if (oidp->oid_number == OID_AUTO) {
  162                 error = EINVAL;
  163         } else {
  164                 SLIST_FOREACH(p, oidp->oid_parent, oid_link) {
  165                         if (p == oidp) {
  166                                 SLIST_REMOVE(oidp->oid_parent, oidp,
  167                                     sysctl_oid, oid_link);
  168                                 error = 0;
  169                                 break;
  170                         }
  171                 }
  172         }
  173 
  174         /* 
  175          * This can happen when a module fails to register and is
  176          * being unloaded afterwards.  It should not be a panic()
  177          * for normal use.
  178          */
  179         if (error)
  180                 printf("%s: failed to unregister sysctl\n", __func__);
  181 }
  182 
  183 /* Initialize a new context to keep track of dynamically added sysctls. */
  184 int
  185 sysctl_ctx_init(struct sysctl_ctx_list *c)
  186 {
  187 
  188         if (c == NULL) {
  189                 return (EINVAL);
  190         }
  191         TAILQ_INIT(c);
  192         return (0);
  193 }
  194 
  195 /* Free the context, and destroy all dynamic oids registered in this context */
  196 int
  197 sysctl_ctx_free(struct sysctl_ctx_list *clist)
  198 {
  199         struct sysctl_ctx_entry *e, *e1;
  200         int error;
  201 
  202         error = 0;
  203         /*
  204          * First perform a "dry run" to check if it's ok to remove oids.
  205          * XXX FIXME
  206          * XXX This algorithm is a hack. But I don't know any
  207          * XXX better solution for now...
  208          */
  209         TAILQ_FOREACH(e, clist, link) {
  210                 error = sysctl_remove_oid(e->entry, 0, 0);
  211                 if (error)
  212                         break;
  213         }
  214         /*
  215          * Restore deregistered entries, either from the end,
  216          * or from the place where error occured.
  217          * e contains the entry that was not unregistered
  218          */
  219         if (error)
  220                 e1 = TAILQ_PREV(e, sysctl_ctx_list, link);
  221         else
  222                 e1 = TAILQ_LAST(clist, sysctl_ctx_list);
  223         while (e1 != NULL) {
  224                 sysctl_register_oid(e1->entry);
  225                 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link);
  226         }
  227         if (error)
  228                 return(EBUSY);
  229         /* Now really delete the entries */
  230         e = TAILQ_FIRST(clist);
  231         while (e != NULL) {
  232                 e1 = TAILQ_NEXT(e, link);
  233                 error = sysctl_remove_oid(e->entry, 1, 0);
  234                 if (error)
  235                         panic("sysctl_remove_oid: corrupt tree, entry: %s",
  236                             e->entry->oid_name);
  237                 free(e, M_SYSCTLOID);
  238                 e = e1;
  239         }
  240         return (error);
  241 }
  242 
  243 /* Add an entry to the context */
  244 struct sysctl_ctx_entry *
  245 sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
  246 {
  247         struct sysctl_ctx_entry *e;
  248 
  249         if (clist == NULL || oidp == NULL)
  250                 return(NULL);
  251         e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK);
  252         e->entry = oidp;
  253         TAILQ_INSERT_HEAD(clist, e, link);
  254         return (e);
  255 }
  256 
  257 /* Find an entry in the context */
  258 struct sysctl_ctx_entry *
  259 sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
  260 {
  261         struct sysctl_ctx_entry *e;
  262 
  263         if (clist == NULL || oidp == NULL)
  264                 return(NULL);
  265         TAILQ_FOREACH(e, clist, link) {
  266                 if(e->entry == oidp)
  267                         return(e);
  268         }
  269         return (e);
  270 }
  271 
  272 /*
  273  * Delete an entry from the context.
  274  * NOTE: this function doesn't free oidp! You have to remove it
  275  * with sysctl_remove_oid().
  276  */
  277 int
  278 sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
  279 {
  280         struct sysctl_ctx_entry *e;
  281 
  282         if (clist == NULL || oidp == NULL)
  283                 return (EINVAL);
  284         e = sysctl_ctx_entry_find(clist, oidp);
  285         if (e != NULL) {
  286                 TAILQ_REMOVE(clist, e, link);
  287                 free(e, M_SYSCTLOID);
  288                 return (0);
  289         } else
  290                 return (ENOENT);
  291 }
  292 
  293 /*
  294  * Remove dynamically created sysctl trees.
  295  * oidp - top of the tree to be removed
  296  * del - if 0 - just deregister, otherwise free up entries as well
  297  * recurse - if != 0 traverse the subtree to be deleted
  298  */
  299 int
  300 sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse)
  301 {
  302         struct sysctl_oid *p;
  303         int error;
  304 
  305         if (oidp == NULL)
  306                 return(EINVAL);
  307         if ((oidp->oid_kind & CTLFLAG_DYN) == 0) {
  308                 printf("can't remove non-dynamic nodes!\n");
  309                 return (EINVAL);
  310         }
  311         /*
  312          * WARNING: normal method to do this should be through
  313          * sysctl_ctx_free(). Use recursing as the last resort
  314          * method to purge your sysctl tree of leftovers...
  315          * However, if some other code still references these nodes,
  316          * it will panic.
  317          */
  318         if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
  319                 if (oidp->oid_refcnt == 1) {
  320                         SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) {
  321                                 if (!recurse)
  322                                         return (ENOTEMPTY);
  323                                 error = sysctl_remove_oid(p, del, recurse);
  324                                 if (error)
  325                                         return (error);
  326                         }
  327                         if (del)
  328                                 free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID);
  329                 }
  330         }
  331         if (oidp->oid_refcnt > 1 ) {
  332                 oidp->oid_refcnt--;
  333         } else {
  334                 if (oidp->oid_refcnt == 0) {
  335                         printf("Warning: bad oid_refcnt=%u (%s)!\n",
  336                                 oidp->oid_refcnt, oidp->oid_name);
  337                         return (EINVAL);
  338                 }
  339                 sysctl_unregister_oid(oidp);
  340                 if (del) {
  341                         if (oidp->oid_descr)
  342                                 free((void *)(uintptr_t)(const void *)oidp->oid_descr, M_SYSCTLOID);
  343                         free((void *)(uintptr_t)(const void *)oidp->oid_name,
  344                              M_SYSCTLOID);
  345                         free(oidp, M_SYSCTLOID);
  346                 }
  347         }
  348         return (0);
  349 }
  350 
  351 /*
  352  * Create new sysctls at run time.
  353  * clist may point to a valid context initialized with sysctl_ctx_init().
  354  */
  355 struct sysctl_oid *
  356 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent,
  357         int number, const char *name, int kind, void *arg1, int arg2,
  358         int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr)
  359 {
  360         struct sysctl_oid *oidp;
  361         ssize_t len;
  362         char *newname;
  363 
  364         /* You have to hook up somewhere.. */
  365         if (parent == NULL)
  366                 return(NULL);
  367         /* Check if the node already exists, otherwise create it */
  368         oidp = sysctl_find_oidname(name, parent);
  369         if (oidp != NULL) {
  370                 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
  371                         oidp->oid_refcnt++;
  372                         /* Update the context */
  373                         if (clist != NULL)
  374                                 sysctl_ctx_entry_add(clist, oidp);
  375                         return (oidp);
  376                 } else {
  377                         printf("can't re-use a leaf (%s)!\n", name);
  378                         return (NULL);
  379                 }
  380         }
  381         oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO);
  382         oidp->oid_parent = parent;
  383         SLIST_NEXT(oidp, oid_link) = NULL;
  384         oidp->oid_number = number;
  385         oidp->oid_refcnt = 1;
  386         len = strlen(name);
  387         newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK);
  388         bcopy(name, newname, len + 1);
  389         newname[len] = '\0';
  390         oidp->oid_name = newname;
  391         oidp->oid_handler = handler;
  392         oidp->oid_kind = CTLFLAG_DYN | kind;
  393         if ((kind & CTLTYPE) == CTLTYPE_NODE) {
  394                 /* Allocate space for children */
  395                 SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list),
  396                     M_SYSCTLOID, M_WAITOK));
  397                 SLIST_INIT(SYSCTL_CHILDREN(oidp));
  398         } else {
  399                 oidp->oid_arg1 = arg1;
  400                 oidp->oid_arg2 = arg2;
  401         }
  402         oidp->oid_fmt = fmt;
  403         if (descr) {
  404                 int len = strlen(descr) + 1;
  405                 oidp->oid_descr = malloc(len, M_SYSCTLOID, M_WAITOK);
  406                 if (oidp->oid_descr)
  407                         strcpy((char *)(uintptr_t)(const void *)oidp->oid_descr, descr);
  408         }
  409         /* Update the context, if used */
  410         if (clist != NULL)
  411                 sysctl_ctx_entry_add(clist, oidp);
  412         /* Register this oid */
  413         sysctl_register_oid(oidp);
  414         return (oidp);
  415 }
  416 
  417 /*
  418  * Reparent an existing oid.
  419  */
  420 int
  421 sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent)
  422 {
  423         struct sysctl_oid *oidp;
  424 
  425         if (oid->oid_parent == parent)
  426                 return (0);
  427         oidp = sysctl_find_oidname(oid->oid_name, parent);
  428         if (oidp != NULL)
  429                 return (EEXIST);
  430         sysctl_unregister_oid(oid);
  431         oid->oid_parent = parent;
  432         oid->oid_number = OID_AUTO;
  433         sysctl_register_oid(oid);
  434         return (0);
  435 }
  436 
  437 /*
  438  * Register the kernel's oids on startup.
  439  */
  440 SET_DECLARE(sysctl_set, struct sysctl_oid);
  441 
  442 static void
  443 sysctl_register_all(void *arg)
  444 {
  445         struct sysctl_oid **oidp;
  446 
  447         SYSCTL_INIT();
  448         SET_FOREACH(oidp, sysctl_set)
  449                 sysctl_register_oid(*oidp);
  450 }
  451 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0);
  452 
  453 /*
  454  * "Staff-functions"
  455  *
  456  * These functions implement a presently undocumented interface 
  457  * used by the sysctl program to walk the tree, and get the type
  458  * so it can print the value.
  459  * This interface is under work and consideration, and should probably
  460  * be killed with a big axe by the first person who can find the time.
  461  * (be aware though, that the proper interface isn't as obvious as it
  462  * may seem, there are various conflicting requirements.
  463  *
  464  * {0,0}        printf the entire MIB-tree.
  465  * {0,1,...}    return the name of the "..." OID.
  466  * {0,2,...}    return the next OID.
  467  * {0,3}        return the OID of the name in "new"
  468  * {0,4,...}    return the kind & format info for the "..." OID.
  469  * {0,5,...}    return the description the "..." OID.
  470  */
  471 
  472 #ifdef SYSCTL_DEBUG
  473 static void
  474 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
  475 {
  476         int k;
  477         struct sysctl_oid *oidp;
  478 
  479         SLIST_FOREACH(oidp, l, oid_link) {
  480 
  481                 for (k=0; k<i; k++)
  482                         printf(" ");
  483 
  484                 printf("%d %s ", oidp->oid_number, oidp->oid_name);
  485 
  486                 printf("%c%c",
  487                         oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
  488                         oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
  489 
  490                 if (oidp->oid_handler)
  491                         printf(" *Handler");
  492 
  493                 switch (oidp->oid_kind & CTLTYPE) {
  494                         case CTLTYPE_NODE:
  495                                 printf(" Node\n");
  496                                 if (!oidp->oid_handler) {
  497                                         sysctl_sysctl_debug_dump_node(
  498                                                 oidp->oid_arg1, i+2);
  499                                 }
  500                                 break;
  501                         case CTLTYPE_INT:    printf(" Int\n"); break;
  502                         case CTLTYPE_STRING: printf(" String\n"); break;
  503                         case CTLTYPE_QUAD:   printf(" Quad\n"); break;
  504                         case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
  505                         default:             printf("\n");
  506                 }
  507 
  508         }
  509 }
  510 
  511 static int
  512 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS)
  513 {
  514         int error;
  515 
  516         error = priv_check(req->td, PRIV_SYSCTL_DEBUG);
  517         if (error)
  518                 return (error);
  519         sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
  520         return (ENOENT);
  521 }
  522 
  523 SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD,
  524         0, 0, sysctl_sysctl_debug, "-", "");
  525 #endif
  526 
  527 static int
  528 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS)
  529 {
  530         int *name = (int *) arg1;
  531         u_int namelen = arg2;
  532         int error = 0;
  533         struct sysctl_oid *oid;
  534         struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
  535         char buf[10];
  536 
  537         while (namelen) {
  538                 if (!lsp) {
  539                         snprintf(buf,sizeof(buf),"%d",*name);
  540                         if (req->oldidx)
  541                                 error = SYSCTL_OUT(req, ".", 1);
  542                         if (!error)
  543                                 error = SYSCTL_OUT(req, buf, strlen(buf));
  544                         if (error)
  545                                 return (error);
  546                         namelen--;
  547                         name++;
  548                         continue;
  549                 }
  550                 lsp2 = 0;
  551                 SLIST_FOREACH(oid, lsp, oid_link) {
  552                         if (oid->oid_number != *name)
  553                                 continue;
  554 
  555                         if (req->oldidx)
  556                                 error = SYSCTL_OUT(req, ".", 1);
  557                         if (!error)
  558                                 error = SYSCTL_OUT(req, oid->oid_name,
  559                                         strlen(oid->oid_name));
  560                         if (error)
  561                                 return (error);
  562 
  563                         namelen--;
  564                         name++;
  565 
  566                         if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 
  567                                 break;
  568 
  569                         if (oid->oid_handler)
  570                                 break;
  571 
  572                         lsp2 = (struct sysctl_oid_list *)oid->oid_arg1;
  573                         break;
  574                 }
  575                 lsp = lsp2;
  576         }
  577         return (SYSCTL_OUT(req, "", 1));
  578 }
  579 
  580 static SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, "");
  581 
  582 static int
  583 sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 
  584         int *next, int *len, int level, struct sysctl_oid **oidpp)
  585 {
  586         struct sysctl_oid *oidp;
  587 
  588         *len = level;
  589         SLIST_FOREACH(oidp, lsp, oid_link) {
  590                 *next = oidp->oid_number;
  591                 *oidpp = oidp;
  592 
  593                 if (oidp->oid_kind & CTLFLAG_SKIP)
  594                         continue;
  595 
  596                 if (!namelen) {
  597                         if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 
  598                                 return (0);
  599                         if (oidp->oid_handler) 
  600                                 /* We really should call the handler here...*/
  601                                 return (0);
  602                         lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  603                         if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 
  604                                 len, level+1, oidpp))
  605                                 return (0);
  606                         goto emptynode;
  607                 }
  608 
  609                 if (oidp->oid_number < *name)
  610                         continue;
  611 
  612                 if (oidp->oid_number > *name) {
  613                         if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
  614                                 return (0);
  615                         if (oidp->oid_handler)
  616                                 return (0);
  617                         lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  618                         if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 
  619                                 next+1, len, level+1, oidpp))
  620                                 return (0);
  621                         goto next;
  622                 }
  623                 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
  624                         continue;
  625 
  626                 if (oidp->oid_handler)
  627                         continue;
  628 
  629                 lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  630                 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 
  631                         len, level+1, oidpp))
  632                         return (0);
  633         next:
  634                 namelen = 1;
  635         emptynode:
  636                 *len = level;
  637         }
  638         return (1);
  639 }
  640 
  641 static int
  642 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS)
  643 {
  644         int *name = (int *) arg1;
  645         u_int namelen = arg2;
  646         int i, j, error;
  647         struct sysctl_oid *oid;
  648         struct sysctl_oid_list *lsp = &sysctl__children;
  649         int newoid[CTL_MAXNAME];
  650 
  651         i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid);
  652         if (i)
  653                 return (ENOENT);
  654         error = SYSCTL_OUT(req, newoid, j * sizeof (int));
  655         return (error);
  656 }
  657 
  658 static SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, "");
  659 
  660 static int
  661 name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp)
  662 {
  663         int i;
  664         struct sysctl_oid *oidp;
  665         struct sysctl_oid_list *lsp = &sysctl__children;
  666         char *p;
  667 
  668         if (!*name)
  669                 return (ENOENT);
  670 
  671         p = name + strlen(name) - 1 ;
  672         if (*p == '.')
  673                 *p = '\0';
  674 
  675         *len = 0;
  676 
  677         for (p = name; *p && *p != '.'; p++) 
  678                 ;
  679         i = *p;
  680         if (i == '.')
  681                 *p = '\0';
  682 
  683         oidp = SLIST_FIRST(lsp);
  684 
  685         while (oidp && *len < CTL_MAXNAME) {
  686                 if (strcmp(name, oidp->oid_name)) {
  687                         oidp = SLIST_NEXT(oidp, oid_link);
  688                         continue;
  689                 }
  690                 *oid++ = oidp->oid_number;
  691                 (*len)++;
  692 
  693                 if (!i) {
  694                         if (oidpp)
  695                                 *oidpp = oidp;
  696                         return (0);
  697                 }
  698 
  699                 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
  700                         break;
  701 
  702                 if (oidp->oid_handler)
  703                         break;
  704 
  705                 lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
  706                 oidp = SLIST_FIRST(lsp);
  707                 name = p+1;
  708                 for (p = name; *p && *p != '.'; p++) 
  709                                 ;
  710                 i = *p;
  711                 if (i == '.')
  712                         *p = '\0';
  713         }
  714         return (ENOENT);
  715 }
  716 
  717 static int
  718 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS)
  719 {
  720         char *p;
  721         int error, oid[CTL_MAXNAME], len;
  722         struct sysctl_oid *op = 0;
  723 
  724         if (!req->newlen) 
  725                 return (ENOENT);
  726         if (req->newlen >= MAXPATHLEN)  /* XXX arbitrary, undocumented */
  727                 return (ENAMETOOLONG);
  728 
  729         p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK);
  730 
  731         error = SYSCTL_IN(req, p, req->newlen);
  732         if (error) {
  733                 free(p, M_SYSCTL);
  734                 return (error);
  735         }
  736 
  737         p [req->newlen] = '\0';
  738 
  739         error = name2oid(p, oid, &len, &op);
  740 
  741         free(p, M_SYSCTL);
  742 
  743         if (error)
  744                 return (error);
  745 
  746         error = SYSCTL_OUT(req, oid, len * sizeof *oid);
  747         return (error);
  748 }
  749 
  750 SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, 
  751         sysctl_sysctl_name2oid, "I", "");
  752 
  753 static int
  754 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS)
  755 {
  756         struct sysctl_oid *oid;
  757         int error;
  758 
  759         error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
  760         if (error)
  761                 return (error);
  762 
  763         if (!oid->oid_fmt)
  764                 return (ENOENT);
  765         error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind));
  766         if (error)
  767                 return (error);
  768         error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1);
  769         return (error);
  770 }
  771 
  772 
  773 static SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, "");
  774 
  775 static int
  776 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS)
  777 {
  778         struct sysctl_oid *oid;
  779         int error;
  780 
  781         error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
  782         if (error)
  783                 return (error);
  784 
  785         if (!oid->oid_descr)
  786                 return (ENOENT);
  787         error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1);
  788         return (error);
  789 }
  790 
  791 static SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, "");
  792 
  793 /*
  794  * Default "handler" functions.
  795  */
  796 
  797 /*
  798  * Handle an int, signed or unsigned.
  799  * Two cases:
  800  *     a variable:  point arg1 at it.
  801  *     a constant:  pass it in arg2.
  802  */
  803 
  804 int
  805 sysctl_handle_int(SYSCTL_HANDLER_ARGS)
  806 {
  807         int tmpout, error = 0;
  808 
  809         /*
  810          * Attempt to get a coherent snapshot by making a copy of the data.
  811          */
  812         if (arg1)
  813                 tmpout = *(int *)arg1;
  814         else
  815                 tmpout = arg2;
  816         error = SYSCTL_OUT(req, &tmpout, sizeof(int));
  817 
  818         if (error || !req->newptr)
  819                 return (error);
  820 
  821         if (!arg1)
  822                 error = EPERM;
  823         else
  824                 error = SYSCTL_IN(req, arg1, sizeof(int));
  825         return (error);
  826 }
  827 
  828 
  829 /*
  830  * Based on on sysctl_handle_int() convert milliseconds into ticks.
  831  */
  832 
  833 int
  834 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
  835 {
  836         int error, s, tt;
  837 
  838         tt = *(int *)oidp->oid_arg1;
  839         s = (int)((int64_t)tt * 1000 / hz);
  840 
  841         error = sysctl_handle_int(oidp, &s, 0, req);
  842         if (error || !req->newptr)
  843                 return (error);
  844 
  845         tt = (int)((int64_t)s * hz / 1000);
  846         if (tt < 1)
  847                 return (EINVAL);
  848 
  849         *(int *)oidp->oid_arg1 = tt;
  850         return (0);
  851 }
  852 
  853 
  854 /*
  855  * Handle a long, signed or unsigned.  arg1 points to it.
  856  */
  857 
  858 int
  859 sysctl_handle_long(SYSCTL_HANDLER_ARGS)
  860 {
  861         int error = 0;
  862         long tmplong;
  863 #ifdef SCTL_MASK32
  864         int tmpint;
  865 #endif
  866 
  867         /*
  868          * Attempt to get a coherent snapshot by making a copy of the data.
  869          */
  870         if (!arg1)
  871                 return (EINVAL);
  872         tmplong = *(long *)arg1;
  873 #ifdef SCTL_MASK32
  874         if (req->flags & SCTL_MASK32) {
  875                 tmpint = tmplong;
  876                 error = SYSCTL_OUT(req, &tmpint, sizeof(int));
  877         } else
  878 #endif
  879                 error = SYSCTL_OUT(req, &tmplong, sizeof(long));
  880 
  881         if (error || !req->newptr)
  882                 return (error);
  883 
  884 #ifdef SCTL_MASK32
  885         if (req->flags & SCTL_MASK32) {
  886                 error = SYSCTL_IN(req, &tmpint, sizeof(int));
  887                 *(long *)arg1 = (long)tmpint;
  888         } else
  889 #endif
  890                 error = SYSCTL_IN(req, arg1, sizeof(long));
  891         return (error);
  892 }
  893 
  894 /*
  895  * Handle a 64 bit int, signed or unsigned.  arg1 points to it.
  896  */
  897 
  898 int
  899 sysctl_handle_quad(SYSCTL_HANDLER_ARGS)
  900 {
  901         int error = 0;
  902         uint64_t tmpout;
  903 
  904         /*
  905          * Attempt to get a coherent snapshot by making a copy of the data.
  906          */
  907         if (!arg1)
  908                 return (EINVAL);
  909         tmpout = *(uint64_t *)arg1;
  910         error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t));
  911 
  912         if (error || !req->newptr)
  913                 return (error);
  914 
  915         error = SYSCTL_IN(req, arg1, sizeof(uint64_t));
  916         return (error);
  917 }
  918 
  919 /*
  920  * Handle our generic '\0' terminated 'C' string.
  921  * Two cases:
  922  *      a variable string:  point arg1 at it, arg2 is max length.
  923  *      a constant string:  point arg1 at it, arg2 is zero.
  924  */
  925 
  926 int
  927 sysctl_handle_string(SYSCTL_HANDLER_ARGS)
  928 {
  929         int error=0;
  930         char *tmparg;
  931         size_t outlen;
  932 
  933         /*
  934          * Attempt to get a coherent snapshot by copying to a
  935          * temporary kernel buffer.
  936          */
  937 retry:
  938         outlen = strlen((char *)arg1)+1;
  939         tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK);
  940 
  941         if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) {
  942                 free(tmparg, M_SYSCTLTMP);
  943                 goto retry;
  944         }
  945 
  946         error = SYSCTL_OUT(req, tmparg, outlen);
  947         free(tmparg, M_SYSCTLTMP);
  948 
  949         if (error || !req->newptr)
  950                 return (error);
  951 
  952         if ((req->newlen - req->newidx) >= arg2) {
  953                 error = EINVAL;
  954         } else {
  955                 arg2 = (req->newlen - req->newidx);
  956                 error = SYSCTL_IN(req, arg1, arg2);
  957                 ((char *)arg1)[arg2] = '\0';
  958         }
  959 
  960         return (error);
  961 }
  962 
  963 /*
  964  * Handle any kind of opaque data.
  965  * arg1 points to it, arg2 is the size.
  966  */
  967 
  968 int
  969 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
  970 {
  971         int error, tries;
  972         u_int generation;
  973         struct sysctl_req req2;
  974 
  975         /*
  976          * Attempt to get a coherent snapshot, by using the thread
  977          * pre-emption counter updated from within mi_switch() to
  978          * determine if we were pre-empted during a bcopy() or
  979          * copyout(). Make 3 attempts at doing this before giving up.
  980          * If we encounter an error, stop immediately.
  981          */
  982         tries = 0;
  983         req2 = *req;
  984 retry:
  985         generation = curthread->td_generation;
  986         error = SYSCTL_OUT(req, arg1, arg2);
  987         if (error)
  988                 return (error);
  989         tries++;
  990         if (generation != curthread->td_generation && tries < 3) {
  991                 *req = req2;
  992                 goto retry;
  993         }
  994 
  995         error = SYSCTL_IN(req, arg1, arg2);
  996 
  997         return (error);
  998 }
  999 
 1000 /*
 1001  * Transfer functions to/from kernel space.
 1002  * XXX: rather untested at this point
 1003  */
 1004 static int
 1005 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
 1006 {
 1007         size_t i = 0;
 1008 
 1009         if (req->oldptr) {
 1010                 i = l;
 1011                 if (req->oldlen <= req->oldidx)
 1012                         i = 0;
 1013                 else
 1014                         if (i > req->oldlen - req->oldidx)
 1015                                 i = req->oldlen - req->oldidx;
 1016                 if (i > 0)
 1017                         bcopy(p, (char *)req->oldptr + req->oldidx, i);
 1018         }
 1019         req->oldidx += l;
 1020         if (req->oldptr && i != l)
 1021                 return (ENOMEM);
 1022         return (0);
 1023 }
 1024 
 1025 static int
 1026 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
 1027 {
 1028         if (!req->newptr)
 1029                 return (0);
 1030         if (req->newlen - req->newidx < l)
 1031                 return (EINVAL);
 1032         bcopy((char *)req->newptr + req->newidx, p, l);
 1033         req->newidx += l;
 1034         return (0);
 1035 }
 1036 
 1037 int
 1038 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
 1039     size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags)
 1040 {
 1041         int error = 0;
 1042         struct sysctl_req req;
 1043 
 1044         bzero(&req, sizeof req);
 1045 
 1046         req.td = td;
 1047         req.flags = flags;
 1048 
 1049         if (oldlenp) {
 1050                 req.oldlen = *oldlenp;
 1051         }
 1052         req.validlen = req.oldlen;
 1053 
 1054         if (old) {
 1055                 req.oldptr= old;
 1056         }
 1057 
 1058         if (new != NULL) {
 1059                 req.newlen = newlen;
 1060                 req.newptr = new;
 1061         }
 1062 
 1063         req.oldfunc = sysctl_old_kernel;
 1064         req.newfunc = sysctl_new_kernel;
 1065         req.lock = REQ_LOCKED;
 1066 
 1067         SYSCTL_LOCK();
 1068 
 1069         error = sysctl_root(0, name, namelen, &req);
 1070 
 1071         if (req.lock == REQ_WIRED && req.validlen > 0)
 1072                 vsunlock(req.oldptr, req.validlen);
 1073 
 1074         SYSCTL_UNLOCK();
 1075 
 1076         if (error && error != ENOMEM)
 1077                 return (error);
 1078 
 1079         if (retval) {
 1080                 if (req.oldptr && req.oldidx > req.validlen)
 1081                         *retval = req.validlen;
 1082                 else
 1083                         *retval = req.oldidx;
 1084         }
 1085         return (error);
 1086 }
 1087 
 1088 int
 1089 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp,
 1090     void *new, size_t newlen, size_t *retval, int flags)
 1091 {
 1092         int oid[CTL_MAXNAME];
 1093         size_t oidlen, plen;
 1094         int error;
 1095 
 1096         oid[0] = 0;             /* sysctl internal magic */
 1097         oid[1] = 3;             /* name2oid */
 1098         oidlen = sizeof(oid);
 1099 
 1100         error = kernel_sysctl(td, oid, 2, oid, &oidlen,
 1101             (void *)name, strlen(name), &plen, flags);
 1102         if (error)
 1103                 return (error);
 1104 
 1105         error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp,
 1106             new, newlen, retval, flags);
 1107         return (error);
 1108 }
 1109 
 1110 /*
 1111  * Transfer function to/from user space.
 1112  */
 1113 static int
 1114 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
 1115 {
 1116         int error = 0;
 1117         size_t i, len, origidx;
 1118 
 1119         origidx = req->oldidx;
 1120         req->oldidx += l;
 1121         if (req->oldptr == NULL)
 1122                 return (0);
 1123         /*
 1124          * If we have not wired the user supplied buffer and we are currently
 1125          * holding locks, drop a witness warning, as it's possible that
 1126          * write operations to the user page can sleep.
 1127          */
 1128         if (req->lock != REQ_WIRED)
 1129                 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
 1130                     "sysctl_old_user()");
 1131         i = l;
 1132         len = req->validlen;
 1133         if (len <= origidx)
 1134                 i = 0;
 1135         else {
 1136                 if (i > len - origidx)
 1137                         i = len - origidx;
 1138                 error = copyout(p, (char *)req->oldptr + origidx, i);
 1139         }
 1140         if (error)
 1141                 return (error);
 1142         if (i < l)
 1143                 return (ENOMEM);
 1144         return (0);
 1145 }
 1146 
 1147 static int
 1148 sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
 1149 {
 1150         int error;
 1151 
 1152         if (!req->newptr)
 1153                 return (0);
 1154         if (req->newlen - req->newidx < l)
 1155                 return (EINVAL);
 1156         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
 1157             "sysctl_new_user()");
 1158         error = copyin((char *)req->newptr + req->newidx, p, l);
 1159         req->newidx += l;
 1160         return (error);
 1161 }
 1162 
 1163 /*
 1164  * Wire the user space destination buffer.  If set to a value greater than
 1165  * zero, the len parameter limits the maximum amount of wired memory.
 1166  */
 1167 int
 1168 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len)
 1169 {
 1170         int ret;
 1171         size_t i, wiredlen;
 1172         char *cp, dummy;
 1173 
 1174         wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen;
 1175         ret = 0;
 1176         if (req->lock == REQ_LOCKED && req->oldptr &&
 1177             req->oldfunc == sysctl_old_user) {
 1178                 if (wiredlen != 0) {
 1179                         ret = vslock(req->oldptr, wiredlen);
 1180                         if (ret != 0) {
 1181                                 if (ret != ENOMEM)
 1182                                         return (ret);
 1183                                 wiredlen = 0;
 1184                         }
 1185                         /*
 1186                          * Touch all the wired pages to avoid PTE modified
 1187                          * bit emulation traps on Alpha while holding locks
 1188                          * in the sysctl handler.
 1189                          */
 1190                         for (i = (wiredlen + PAGE_SIZE - 1) / PAGE_SIZE,
 1191                             cp = req->oldptr; i > 0; i--, cp += PAGE_SIZE) {
 1192                                 copyin(cp, &dummy, 1);
 1193                                 copyout(&dummy, cp, 1);
 1194                         }
 1195                 }
 1196                 req->lock = REQ_WIRED;
 1197                 req->validlen = wiredlen;
 1198         }
 1199         return (0);
 1200 }
 1201 
 1202 int
 1203 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
 1204     int *nindx, struct sysctl_req *req)
 1205 {
 1206         struct sysctl_oid *oid;
 1207         int indx;
 1208 
 1209         oid = SLIST_FIRST(&sysctl__children);
 1210         indx = 0;
 1211         while (oid && indx < CTL_MAXNAME) {
 1212                 if (oid->oid_number == name[indx]) {
 1213                         indx++;
 1214                         if (oid->oid_kind & CTLFLAG_NOLOCK)
 1215                                 req->lock = REQ_UNLOCKED;
 1216                         if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
 1217                                 if (oid->oid_handler != NULL ||
 1218                                     indx == namelen) {
 1219                                         *noid = oid;
 1220                                         if (nindx != NULL)
 1221                                                 *nindx = indx;
 1222                                         return (0);
 1223                                 }
 1224                                 oid = SLIST_FIRST(
 1225                                     (struct sysctl_oid_list *)oid->oid_arg1);
 1226                         } else if (indx == namelen) {
 1227                                 *noid = oid;
 1228                                 if (nindx != NULL)
 1229                                         *nindx = indx;
 1230                                 return (0);
 1231                         } else {
 1232                                 return (ENOTDIR);
 1233                         }
 1234                 } else {
 1235                         oid = SLIST_NEXT(oid, oid_link);
 1236                 }
 1237         }
 1238         return (ENOENT);
 1239 }
 1240 
 1241 /*
 1242  * Traverse our tree, and find the right node, execute whatever it points
 1243  * to, and return the resulting error code.
 1244  */
 1245 
 1246 static int
 1247 sysctl_root(SYSCTL_HANDLER_ARGS)
 1248 {
 1249         struct sysctl_oid *oid;
 1250         int error, indx, lvl;
 1251 
 1252         error = sysctl_find_oid(arg1, arg2, &oid, &indx, req);
 1253         if (error)
 1254                 return (error);
 1255 
 1256         if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
 1257                 /*
 1258                  * You can't call a sysctl when it's a node, but has
 1259                  * no handler.  Inform the user that it's a node.
 1260                  * The indx may or may not be the same as namelen.
 1261                  */
 1262                 if (oid->oid_handler == NULL)
 1263                         return (EISDIR);
 1264         }
 1265 
 1266         /* Is this sysctl writable? */
 1267         if (req->newptr && !(oid->oid_kind & CTLFLAG_WR))
 1268                 return (EPERM);
 1269 
 1270         KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL"));
 1271 
 1272         /* Is this sysctl sensitive to securelevels? */
 1273         if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) {
 1274                 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE;
 1275                 error = securelevel_gt(req->td->td_ucred, lvl);
 1276                 if (error)
 1277                         return (error);
 1278         }
 1279 
 1280         /* Is this sysctl writable by only privileged users? */
 1281         if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) {
 1282                 if (oid->oid_kind & CTLFLAG_PRISON)
 1283                         error = priv_check(req->td, PRIV_SYSCTL_WRITEJAIL);
 1284                 else
 1285                         error = priv_check(req->td, PRIV_SYSCTL_WRITE);
 1286                 if (error)
 1287                         return (error);
 1288         }
 1289 
 1290         if (!oid->oid_handler)
 1291                 return (EINVAL);
 1292 
 1293         if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
 1294                 arg1 = (int *)arg1 + indx;
 1295                 arg2 -= indx;
 1296         } else {
 1297                 arg1 = oid->oid_arg1;
 1298                 arg2 = oid->oid_arg2;
 1299         }
 1300 #ifdef MAC
 1301         error = mac_check_system_sysctl(req->td->td_ucred, oid, arg1, arg2,
 1302             req);
 1303         if (error != 0)
 1304                 return (error);
 1305 #endif
 1306         error = oid->oid_handler(oid, arg1, arg2, req);
 1307 
 1308         return (error);
 1309 }
 1310 
 1311 #ifndef _SYS_SYSPROTO_H_
 1312 struct sysctl_args {
 1313         int     *name;
 1314         u_int   namelen;
 1315         void    *old;
 1316         size_t  *oldlenp;
 1317         void    *new;
 1318         size_t  newlen;
 1319 };
 1320 #endif
 1321 int
 1322 __sysctl(struct thread *td, struct sysctl_args *uap)
 1323 {
 1324         int error, name[CTL_MAXNAME];
 1325         size_t j;
 1326 
 1327         if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
 1328                 return (EINVAL);
 1329 
 1330         error = copyin(uap->name, &name, uap->namelen * sizeof(int));
 1331         if (error)
 1332                 return (error);
 1333 
 1334         mtx_lock(&Giant);
 1335 
 1336         error = userland_sysctl(td, name, uap->namelen,
 1337                 uap->old, uap->oldlenp, 0,
 1338                 uap->new, uap->newlen, &j, 0);
 1339         if (error && error != ENOMEM)
 1340                 goto done2;
 1341         if (uap->oldlenp) {
 1342                 int i = copyout(&j, uap->oldlenp, sizeof(j));
 1343                 if (i)
 1344                         error = i;
 1345         }
 1346 done2:
 1347         mtx_unlock(&Giant);
 1348         return (error);
 1349 }
 1350 
 1351 /*
 1352  * This is used from various compatibility syscalls too.  That's why name
 1353  * must be in kernel space.
 1354  */
 1355 int
 1356 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
 1357     size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval,
 1358     int flags)
 1359 {
 1360         int error = 0;
 1361         struct sysctl_req req;
 1362 
 1363         bzero(&req, sizeof req);
 1364 
 1365         req.td = td;
 1366         req.flags = flags;
 1367 
 1368         if (oldlenp) {
 1369                 if (inkernel) {
 1370                         req.oldlen = *oldlenp;
 1371                 } else {
 1372                         error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp));
 1373                         if (error)
 1374                                 return (error);
 1375                 }
 1376         }
 1377         req.validlen = req.oldlen;
 1378 
 1379         if (old) {
 1380                 if (!useracc(old, req.oldlen, VM_PROT_WRITE))
 1381                         return (EFAULT);
 1382                 req.oldptr= old;
 1383         }
 1384 
 1385         if (new != NULL) {
 1386                 if (!useracc(new, newlen, VM_PROT_READ))
 1387                         return (EFAULT);
 1388                 req.newlen = newlen;
 1389                 req.newptr = new;
 1390         }
 1391 
 1392         req.oldfunc = sysctl_old_user;
 1393         req.newfunc = sysctl_new_user;
 1394         req.lock = REQ_LOCKED;
 1395 
 1396         SYSCTL_LOCK();
 1397 
 1398         do {
 1399                 req.oldidx = 0;
 1400                 req.newidx = 0;
 1401                 error = sysctl_root(0, name, namelen, &req);
 1402         } while (error == EAGAIN);
 1403 
 1404         if (req.lock == REQ_WIRED && req.validlen > 0)
 1405                 vsunlock(req.oldptr, req.validlen);
 1406 
 1407         SYSCTL_UNLOCK();
 1408 
 1409         if (error && error != ENOMEM)
 1410                 return (error);
 1411 
 1412         if (retval) {
 1413                 if (req.oldptr && req.oldidx > req.validlen)
 1414                         *retval = req.validlen;
 1415                 else
 1416                         *retval = req.oldidx;
 1417         }
 1418         return (error);
 1419 }
 1420 
 1421 #ifdef COMPAT_43
 1422 #include <sys/socket.h>
 1423 #include <vm/vm_param.h>
 1424 
 1425 #define KINFO_PROC              (0<<8)
 1426 #define KINFO_RT                (1<<8)
 1427 #define KINFO_VNODE             (2<<8)
 1428 #define KINFO_FILE              (3<<8)
 1429 #define KINFO_METER             (4<<8)
 1430 #define KINFO_LOADAVG           (5<<8)
 1431 #define KINFO_CLOCKRATE         (6<<8)
 1432 
 1433 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
 1434 #define KINFO_BSDI_SYSINFO      (101<<8)
 1435 
 1436 /*
 1437  * XXX this is bloat, but I hope it's better here than on the potentially
 1438  * limited kernel stack...  -Peter
 1439  */
 1440 
 1441 static struct {
 1442         int     bsdi_machine;           /* "i386" on BSD/386 */
 1443 /*      ^^^ this is an offset to the string, relative to the struct start */
 1444         char    *pad0;
 1445         long    pad1;
 1446         long    pad2;
 1447         long    pad3;
 1448         u_long  pad4;
 1449         u_long  pad5;
 1450         u_long  pad6;
 1451 
 1452         int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
 1453         int     bsdi_osrelease;         /* "1.1" on BSD/386 */
 1454         long    pad7;
 1455         long    pad8;
 1456         char    *pad9;
 1457 
 1458         long    pad10;
 1459         long    pad11;
 1460         int     pad12;
 1461         long    pad13;
 1462         quad_t  pad14;
 1463         long    pad15;
 1464 
 1465         struct  timeval pad16;
 1466         /* we dont set this, because BSDI's uname used gethostname() instead */
 1467         int     bsdi_hostname;          /* hostname on BSD/386 */
 1468 
 1469         /* the actual string data is appended here */
 1470 
 1471 } bsdi_si;
 1472 
 1473 /*
 1474  * this data is appended to the end of the bsdi_si structure during copyout.
 1475  * The "char *" offsets are relative to the base of the bsdi_si struct.
 1476  * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
 1477  * should not exceed the length of the buffer here... (or else!! :-)
 1478  */
 1479 static char bsdi_strings[80];   /* It had better be less than this! */
 1480 
 1481 #ifndef _SYS_SYSPROTO_H_
 1482 struct getkerninfo_args {
 1483         int     op;
 1484         char    *where;
 1485         size_t  *size;
 1486         int     arg;
 1487 };
 1488 #endif
 1489 int
 1490 ogetkerninfo(struct thread *td, struct getkerninfo_args *uap)
 1491 {
 1492         int error, name[6];
 1493         size_t size;
 1494         u_int needed = 0;
 1495 
 1496         mtx_lock(&Giant);
 1497 
 1498         switch (uap->op & 0xff00) {
 1499 
 1500         case KINFO_RT:
 1501                 name[0] = CTL_NET;
 1502                 name[1] = PF_ROUTE;
 1503                 name[2] = 0;
 1504                 name[3] = (uap->op & 0xff0000) >> 16;
 1505                 name[4] = uap->op & 0xff;
 1506                 name[5] = uap->arg;
 1507                 error = userland_sysctl(td, name, 6, uap->where, uap->size,
 1508                         0, 0, 0, &size, 0);
 1509                 break;
 1510 
 1511         case KINFO_VNODE:
 1512                 name[0] = CTL_KERN;
 1513                 name[1] = KERN_VNODE;
 1514                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1515                         0, 0, 0, &size, 0);
 1516                 break;
 1517 
 1518         case KINFO_PROC:
 1519                 name[0] = CTL_KERN;
 1520                 name[1] = KERN_PROC;
 1521                 name[2] = uap->op & 0xff;
 1522                 name[3] = uap->arg;
 1523                 error = userland_sysctl(td, name, 4, uap->where, uap->size,
 1524                         0, 0, 0, &size, 0);
 1525                 break;
 1526 
 1527         case KINFO_FILE:
 1528                 name[0] = CTL_KERN;
 1529                 name[1] = KERN_FILE;
 1530                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1531                         0, 0, 0, &size, 0);
 1532                 break;
 1533 
 1534         case KINFO_METER:
 1535                 name[0] = CTL_VM;
 1536                 name[1] = VM_TOTAL;
 1537                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1538                         0, 0, 0, &size, 0);
 1539                 break;
 1540 
 1541         case KINFO_LOADAVG:
 1542                 name[0] = CTL_VM;
 1543                 name[1] = VM_LOADAVG;
 1544                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1545                         0, 0, 0, &size, 0);
 1546                 break;
 1547 
 1548         case KINFO_CLOCKRATE:
 1549                 name[0] = CTL_KERN;
 1550                 name[1] = KERN_CLOCKRATE;
 1551                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
 1552                         0, 0, 0, &size, 0);
 1553                 break;
 1554 
 1555         case KINFO_BSDI_SYSINFO: {
 1556                 /*
 1557                  * this is pretty crude, but it's just enough for uname()
 1558                  * from BSDI's 1.x libc to work.
 1559                  *
 1560                  * *size gives the size of the buffer before the call, and
 1561                  * the amount of data copied after a successful call.
 1562                  * If successful, the return value is the amount of data
 1563                  * available, which can be larger than *size.
 1564                  *
 1565                  * BSDI's 2.x product apparently fails with ENOMEM if *size
 1566                  * is too small.
 1567                  */
 1568 
 1569                 u_int left;
 1570                 char *s;
 1571 
 1572                 bzero((char *)&bsdi_si, sizeof(bsdi_si));
 1573                 bzero(bsdi_strings, sizeof(bsdi_strings));
 1574 
 1575                 s = bsdi_strings;
 1576 
 1577                 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
 1578                 strcpy(s, ostype);
 1579                 s += strlen(s) + 1;
 1580 
 1581                 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
 1582                 strcpy(s, osrelease);
 1583                 s += strlen(s) + 1;
 1584 
 1585                 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
 1586                 strcpy(s, machine);
 1587                 s += strlen(s) + 1;
 1588 
 1589                 needed = sizeof(bsdi_si) + (s - bsdi_strings);
 1590 
 1591                 if ((uap->where == NULL) || (uap->size == NULL)) {
 1592                         /* process is asking how much buffer to supply.. */
 1593                         size = needed;
 1594                         error = 0;
 1595                         break;
 1596                 }
 1597 
 1598                 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
 1599                         break;
 1600 
 1601                 /* if too much buffer supplied, trim it down */
 1602                 if (size > needed)
 1603                         size = needed;
 1604 
 1605                 /* how much of the buffer is remaining */
 1606                 left = size;
 1607 
 1608                 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
 1609                         break;
 1610 
 1611                 /* is there any point in continuing? */
 1612                 if (left > sizeof(bsdi_si)) {
 1613                         left -= sizeof(bsdi_si);
 1614                         error = copyout(&bsdi_strings,
 1615                                         uap->where + sizeof(bsdi_si), left);
 1616                 }
 1617                 break;
 1618         }
 1619 
 1620         default:
 1621                 error = EOPNOTSUPP;
 1622                 break;
 1623         }
 1624         if (error == 0) {
 1625                 td->td_retval[0] = needed ? needed : size;
 1626                 if (uap->size) {
 1627                         error = copyout(&size, uap->size, sizeof(size));
 1628                 }
 1629         }
 1630         mtx_unlock(&Giant);
 1631         return (error);
 1632 }
 1633 #endif /* COMPAT_43 */

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