The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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