kern_sysctl.c revision 221829
11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1989, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This code is derived from software contributed to Berkeley by 61541Srgrimes * Mike Karels at Berkeley Software Design, Inc. 71541Srgrimes * 812623Sphk * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 912623Sphk * project, to make these variables more userfriendly. 1012623Sphk * 111541Srgrimes * Redistribution and use in source and binary forms, with or without 121541Srgrimes * modification, are permitted provided that the following conditions 131541Srgrimes * are met: 141541Srgrimes * 1. Redistributions of source code must retain the above copyright 151541Srgrimes * notice, this list of conditions and the following disclaimer. 161541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 171541Srgrimes * notice, this list of conditions and the following disclaimer in the 181541Srgrimes * documentation and/or other materials provided with the distribution. 191541Srgrimes * 4. Neither the name of the University nor the names of its contributors 201541Srgrimes * may be used to endorse or promote products derived from this software 211541Srgrimes * without specific prior written permission. 221541Srgrimes * 231541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 241541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 251541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 261541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 271541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 281541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 291541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 301541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 311541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 321541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 331541Srgrimes * SUCH DAMAGE. 341541Srgrimes * 351541Srgrimes * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 361541Srgrimes */ 371541Srgrimes 38116182Sobrien#include <sys/cdefs.h> 39116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_sysctl.c 221829 2011-05-13 05:27:58Z mdf $"); 40116182Sobrien 4131778Seivind#include "opt_compat.h" 42189707Sjhb#include "opt_ktrace.h" 4331778Seivind 441541Srgrimes#include <sys/param.h> 45216060Smdf#include <sys/fail.h> 4648274Speter#include <sys/systm.h> 4748274Speter#include <sys/kernel.h> 481541Srgrimes#include <sys/sysctl.h> 4912623Sphk#include <sys/malloc.h> 50164033Srwatson#include <sys/priv.h> 5112662Sdg#include <sys/proc.h> 52194368Sbz#include <sys/jail.h> 5382746Sdillon#include <sys/lock.h> 5482746Sdillon#include <sys/mutex.h> 55212750Smdf#include <sys/sbuf.h> 5693616Salfred#include <sys/sx.h> 5715103Sphk#include <sys/sysproto.h> 58185983Skib#include <sys/uio.h> 59189707Sjhb#ifdef KTRACE 60189707Sjhb#include <sys/ktrace.h> 61189707Sjhb#endif 62163606Srwatson 63195699Srwatson#include <net/vnet.h> 64195699Srwatson 65163606Srwatson#include <security/mac/mac_framework.h> 66163606Srwatson 6712645Sbde#include <vm/vm.h> 6812662Sdg#include <vm/vm_extern.h> 6912645Sbde 7030354Sphkstatic MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); 7163212Sabialstatic MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); 72100833Struckmanstatic MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); 7330309Sphk 7412429Sphk/* 75188232Sjhb * The sysctllock protects the MIB tree. It also protects sysctl 76188232Sjhb * contexts used with dynamic sysctls. The sysctl_register_oid() and 77188232Sjhb * sysctl_unregister_oid() routines require the sysctllock to already 78188232Sjhb * be held, so the sysctl_lock() and sysctl_unlock() routines are 79188232Sjhb * provided for the few places in the kernel which need to use that 80188232Sjhb * API rather than using the dynamic API. Use of the dynamic API is 81188232Sjhb * strongly encouraged for most code. 82188232Sjhb * 83192125Sjhb * The sysctlmemlock is used to limit the amount of user memory wired for 84192125Sjhb * sysctl requests. This is implemented by serializing any userland 85192125Sjhb * sysctl requests larger than a single page via an exclusive lock. 8612429Sphk */ 8793625Srwatsonstatic struct sx sysctllock; 88192125Sjhbstatic struct sx sysctlmemlock; 8912429Sphk 90188232Sjhb#define SYSCTL_XLOCK() sx_xlock(&sysctllock) 91188232Sjhb#define SYSCTL_XUNLOCK() sx_xunlock(&sysctllock) 92188232Sjhb#define SYSCTL_ASSERT_XLOCKED() sx_assert(&sysctllock, SA_XLOCKED) 93112107Sjhb#define SYSCTL_INIT() sx_init(&sysctllock, "sysctl lock") 94216060Smdf#define SYSCTL_SLEEP(ch, wmesg, timo) \ 95216060Smdf sx_sleep(ch, &sysctllock, 0, wmesg, timo) 9693616Salfred 9762573Sphkstatic int sysctl_root(SYSCTL_HANDLER_ARGS); 9812429Sphk 9944078Sdfrstruct sysctl_oid_list sysctl__children; /* root list */ 10012152Sphk 101188232Sjhbstatic int sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, 102188232Sjhb int recurse); 103188232Sjhb 10463212Sabialstatic struct sysctl_oid * 10563212Sabialsysctl_find_oidname(const char *name, struct sysctl_oid_list *list) 10663212Sabial{ 10763212Sabial struct sysctl_oid *oidp; 10863212Sabial 109216060Smdf SYSCTL_ASSERT_XLOCKED(); 11063212Sabial SLIST_FOREACH(oidp, list, oid_link) { 11163212Sabial if (strcmp(oidp->oid_name, name) == 0) { 11263212Sabial return (oidp); 11363212Sabial } 11463212Sabial } 11563212Sabial return (NULL); 11663212Sabial} 11763212Sabial 11812623Sphk/* 11912623Sphk * Initialization of the MIB tree. 12012623Sphk * 12144078Sdfr * Order by number in each list. 12212623Sphk */ 123188232Sjhbvoid 124188232Sjhbsysctl_lock(void) 125188232Sjhb{ 12612429Sphk 127188232Sjhb SYSCTL_XLOCK(); 128188232Sjhb} 129188232Sjhb 13080338Sroamvoid 131188232Sjhbsysctl_unlock(void) 132188232Sjhb{ 133188232Sjhb 134188232Sjhb SYSCTL_XUNLOCK(); 135188232Sjhb} 136188232Sjhb 137188232Sjhbvoid 13880338Sroamsysctl_register_oid(struct sysctl_oid *oidp) 13912152Sphk{ 14044078Sdfr struct sysctl_oid_list *parent = oidp->oid_parent; 14144078Sdfr struct sysctl_oid *p; 14244078Sdfr struct sysctl_oid *q; 14312197Sbde 14444078Sdfr /* 14563212Sabial * First check if another oid with the same name already 14663212Sabial * exists in the parent's list. 14763212Sabial */ 148188232Sjhb SYSCTL_ASSERT_XLOCKED(); 14963212Sabial p = sysctl_find_oidname(oidp->oid_name, parent); 15063212Sabial if (p != NULL) { 15163212Sabial if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 15263212Sabial p->oid_refcnt++; 15363212Sabial return; 15463212Sabial } else { 15563212Sabial printf("can't re-use a leaf (%s)!\n", p->oid_name); 15663212Sabial return; 15763212Sabial } 15863212Sabial } 15963212Sabial /* 16044078Sdfr * If this oid has a number OID_AUTO, give it a number which 16180339Sroam * is greater than any current oid. 16280339Sroam * NOTE: DO NOT change the starting value here, change it in 16380339Sroam * <sys/sysctl.h>, and make sure it is at least 256 to 16480339Sroam * accomodate e.g. net.inet.raw as a static sysctl node. 16544078Sdfr */ 16644078Sdfr if (oidp->oid_number == OID_AUTO) { 16780339Sroam static int newoid = CTL_AUTO_START; 16871510Smckusick 16971510Smckusick oidp->oid_number = newoid++; 17071510Smckusick if (newoid == 0x7fffffff) 17171510Smckusick panic("out of oids"); 17244078Sdfr } 17384832Sroam#if 0 17484832Sroam else if (oidp->oid_number >= CTL_AUTO_START) { 17584832Sroam /* do not panic; this happens when unregistering sysctl sets */ 17684832Sroam printf("static sysctl oid too high: %d", oidp->oid_number); 17784832Sroam } 17884832Sroam#endif 17944078Sdfr 18044078Sdfr /* 18144078Sdfr * Insert the oid into the parent's list in order. 18244078Sdfr */ 18344078Sdfr q = NULL; 18444078Sdfr SLIST_FOREACH(p, parent, oid_link) { 18544078Sdfr if (oidp->oid_number < p->oid_number) 18644078Sdfr break; 18744078Sdfr q = p; 18844078Sdfr } 18944078Sdfr if (q) 19044078Sdfr SLIST_INSERT_AFTER(q, oidp, oid_link); 19144078Sdfr else 19244078Sdfr SLIST_INSERT_HEAD(parent, oidp, oid_link); 19312152Sphk} 19412131Sphk 19580338Sroamvoid 19680338Sroamsysctl_unregister_oid(struct sysctl_oid *oidp) 19712152Sphk{ 198115391Smux struct sysctl_oid *p; 199115391Smux int error; 200115391Smux 201188232Sjhb SYSCTL_ASSERT_XLOCKED(); 202115391Smux error = ENOENT; 203115391Smux if (oidp->oid_number == OID_AUTO) { 204115391Smux error = EINVAL; 205115391Smux } else { 206115391Smux SLIST_FOREACH(p, oidp->oid_parent, oid_link) { 207115391Smux if (p == oidp) { 208115391Smux SLIST_REMOVE(oidp->oid_parent, oidp, 209115391Smux sysctl_oid, oid_link); 210115391Smux error = 0; 211115391Smux break; 212115391Smux } 213115391Smux } 214115391Smux } 215115391Smux 216115391Smux /* 217115391Smux * This can happen when a module fails to register and is 218115391Smux * being unloaded afterwards. It should not be a panic() 219115391Smux * for normal use. 220115391Smux */ 221115391Smux if (error) 222115391Smux printf("%s: failed to unregister sysctl\n", __func__); 22344078Sdfr} 22412152Sphk 22563212Sabial/* Initialize a new context to keep track of dynamically added sysctls. */ 22663212Sabialint 22763212Sabialsysctl_ctx_init(struct sysctl_ctx_list *c) 22863212Sabial{ 22963212Sabial 23063212Sabial if (c == NULL) { 23163212Sabial return (EINVAL); 23263212Sabial } 233188232Sjhb 234188232Sjhb /* 235188232Sjhb * No locking here, the caller is responsible for not adding 236188232Sjhb * new nodes to a context until after this function has 237188232Sjhb * returned. 238188232Sjhb */ 23963212Sabial TAILQ_INIT(c); 24063212Sabial return (0); 24163212Sabial} 24263212Sabial 24363212Sabial/* Free the context, and destroy all dynamic oids registered in this context */ 24463212Sabialint 24563212Sabialsysctl_ctx_free(struct sysctl_ctx_list *clist) 24663212Sabial{ 24763212Sabial struct sysctl_ctx_entry *e, *e1; 24863212Sabial int error; 24963212Sabial 25063212Sabial error = 0; 25163212Sabial /* 25263212Sabial * First perform a "dry run" to check if it's ok to remove oids. 25363212Sabial * XXX FIXME 25463212Sabial * XXX This algorithm is a hack. But I don't know any 25563212Sabial * XXX better solution for now... 25663212Sabial */ 257188232Sjhb SYSCTL_XLOCK(); 25863212Sabial TAILQ_FOREACH(e, clist, link) { 259188232Sjhb error = sysctl_remove_oid_locked(e->entry, 0, 0); 26063212Sabial if (error) 26163212Sabial break; 26263212Sabial } 26363212Sabial /* 26463212Sabial * Restore deregistered entries, either from the end, 26563212Sabial * or from the place where error occured. 26663212Sabial * e contains the entry that was not unregistered 26763212Sabial */ 26863212Sabial if (error) 26963212Sabial e1 = TAILQ_PREV(e, sysctl_ctx_list, link); 27063212Sabial else 27163212Sabial e1 = TAILQ_LAST(clist, sysctl_ctx_list); 27263212Sabial while (e1 != NULL) { 27363212Sabial sysctl_register_oid(e1->entry); 27463212Sabial e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); 27563212Sabial } 276188232Sjhb if (error) { 277188232Sjhb SYSCTL_XUNLOCK(); 27863212Sabial return(EBUSY); 279188232Sjhb } 28063212Sabial /* Now really delete the entries */ 28163212Sabial e = TAILQ_FIRST(clist); 28263212Sabial while (e != NULL) { 28363212Sabial e1 = TAILQ_NEXT(e, link); 284188232Sjhb error = sysctl_remove_oid_locked(e->entry, 1, 0); 28563212Sabial if (error) 28663212Sabial panic("sysctl_remove_oid: corrupt tree, entry: %s", 28763212Sabial e->entry->oid_name); 28863212Sabial free(e, M_SYSCTLOID); 28963212Sabial e = e1; 29063212Sabial } 291188232Sjhb SYSCTL_XUNLOCK(); 29263212Sabial return (error); 29363212Sabial} 29463212Sabial 29563212Sabial/* Add an entry to the context */ 29663212Sabialstruct sysctl_ctx_entry * 29763212Sabialsysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 29863212Sabial{ 29963212Sabial struct sysctl_ctx_entry *e; 30063212Sabial 301188232Sjhb SYSCTL_ASSERT_XLOCKED(); 30263212Sabial if (clist == NULL || oidp == NULL) 30363212Sabial return(NULL); 304111119Simp e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); 30563212Sabial e->entry = oidp; 30663212Sabial TAILQ_INSERT_HEAD(clist, e, link); 30763212Sabial return (e); 30863212Sabial} 30963212Sabial 31063212Sabial/* Find an entry in the context */ 31163212Sabialstruct sysctl_ctx_entry * 31263212Sabialsysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 31363212Sabial{ 31463212Sabial struct sysctl_ctx_entry *e; 31563212Sabial 316216060Smdf SYSCTL_ASSERT_XLOCKED(); 31763212Sabial if (clist == NULL || oidp == NULL) 31863212Sabial return(NULL); 31971999Sphk TAILQ_FOREACH(e, clist, link) { 32063212Sabial if(e->entry == oidp) 32163212Sabial return(e); 32263212Sabial } 32363212Sabial return (e); 32463212Sabial} 32563212Sabial 32644078Sdfr/* 32763212Sabial * Delete an entry from the context. 32863212Sabial * NOTE: this function doesn't free oidp! You have to remove it 32963212Sabial * with sysctl_remove_oid(). 33063212Sabial */ 33163212Sabialint 33263212Sabialsysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 33363212Sabial{ 33463212Sabial struct sysctl_ctx_entry *e; 33563212Sabial 33663212Sabial if (clist == NULL || oidp == NULL) 33763212Sabial return (EINVAL); 338188232Sjhb SYSCTL_XLOCK(); 33963212Sabial e = sysctl_ctx_entry_find(clist, oidp); 34063212Sabial if (e != NULL) { 34163212Sabial TAILQ_REMOVE(clist, e, link); 342188232Sjhb SYSCTL_XUNLOCK(); 34363212Sabial free(e, M_SYSCTLOID); 34463212Sabial return (0); 345188232Sjhb } else { 346188232Sjhb SYSCTL_XUNLOCK(); 34763212Sabial return (ENOENT); 348188232Sjhb } 34963212Sabial} 35063212Sabial 35163212Sabial/* 35263212Sabial * Remove dynamically created sysctl trees. 35363212Sabial * oidp - top of the tree to be removed 35463212Sabial * del - if 0 - just deregister, otherwise free up entries as well 35563212Sabial * recurse - if != 0 traverse the subtree to be deleted 35663212Sabial */ 35763212Sabialint 35863212Sabialsysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) 35963212Sabial{ 360188232Sjhb int error; 361188232Sjhb 362188232Sjhb SYSCTL_XLOCK(); 363188232Sjhb error = sysctl_remove_oid_locked(oidp, del, recurse); 364188232Sjhb SYSCTL_XUNLOCK(); 365188232Sjhb return (error); 366188232Sjhb} 367188232Sjhb 368219819Sjeffint 369219819Sjeffsysctl_remove_name(struct sysctl_oid *parent, const char *name, 370219819Sjeff int del, int recurse) 371219819Sjeff{ 372219819Sjeff struct sysctl_oid *p, *tmp; 373219819Sjeff int error; 374219819Sjeff 375219819Sjeff error = ENOENT; 376219819Sjeff SYSCTL_XLOCK(); 377219819Sjeff SLIST_FOREACH_SAFE(p, SYSCTL_CHILDREN(parent), oid_link, tmp) { 378219819Sjeff if (strcmp(p->oid_name, name) == 0) { 379219819Sjeff error = sysctl_remove_oid_locked(p, del, recurse); 380219819Sjeff break; 381219819Sjeff } 382219819Sjeff } 383219819Sjeff SYSCTL_XUNLOCK(); 384219819Sjeff 385219819Sjeff return (error); 386219819Sjeff} 387219819Sjeff 388219819Sjeff 389188232Sjhbstatic int 390188232Sjhbsysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse) 391188232Sjhb{ 392219819Sjeff struct sysctl_oid *p, *tmp; 39363212Sabial int error; 39463212Sabial 395188232Sjhb SYSCTL_ASSERT_XLOCKED(); 39663212Sabial if (oidp == NULL) 39763212Sabial return(EINVAL); 39863212Sabial if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 39963212Sabial printf("can't remove non-dynamic nodes!\n"); 40063212Sabial return (EINVAL); 40163212Sabial } 40263212Sabial /* 40363212Sabial * WARNING: normal method to do this should be through 40463212Sabial * sysctl_ctx_free(). Use recursing as the last resort 40563212Sabial * method to purge your sysctl tree of leftovers... 40663212Sabial * However, if some other code still references these nodes, 40763212Sabial * it will panic. 40863212Sabial */ 40963212Sabial if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 41063212Sabial if (oidp->oid_refcnt == 1) { 411219819Sjeff SLIST_FOREACH_SAFE(p, 412219819Sjeff SYSCTL_CHILDREN(oidp), oid_link, tmp) { 41363212Sabial if (!recurse) 41463212Sabial return (ENOTEMPTY); 415188232Sjhb error = sysctl_remove_oid_locked(p, del, 416188232Sjhb recurse); 41763212Sabial if (error) 41863212Sabial return (error); 41963212Sabial } 42063212Sabial if (del) 42163212Sabial free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); 42263212Sabial } 42363212Sabial } 42463212Sabial if (oidp->oid_refcnt > 1 ) { 42563212Sabial oidp->oid_refcnt--; 42663212Sabial } else { 42763212Sabial if (oidp->oid_refcnt == 0) { 42863212Sabial printf("Warning: bad oid_refcnt=%u (%s)!\n", 42963212Sabial oidp->oid_refcnt, oidp->oid_name); 43063212Sabial return (EINVAL); 43163212Sabial } 43263212Sabial sysctl_unregister_oid(oidp); 43363212Sabial if (del) { 434216060Smdf /* 435216060Smdf * Wait for all threads running the handler to drain. 436216060Smdf * This preserves the previous behavior when the 437216060Smdf * sysctl lock was held across a handler invocation, 438216060Smdf * and is necessary for module unload correctness. 439216060Smdf */ 440216060Smdf while (oidp->oid_running > 0) { 441216060Smdf oidp->oid_kind |= CTLFLAG_DYING; 442216060Smdf SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0); 443216060Smdf } 444141433Sphk if (oidp->oid_descr) 445141433Sphk free((void *)(uintptr_t)(const void *)oidp->oid_descr, M_SYSCTLOID); 44663978Speter free((void *)(uintptr_t)(const void *)oidp->oid_name, 44763978Speter M_SYSCTLOID); 44863212Sabial free(oidp, M_SYSCTLOID); 44963212Sabial } 45063212Sabial } 45163212Sabial return (0); 45263212Sabial} 45363212Sabial/* 45463212Sabial * Create new sysctls at run time. 45563212Sabial * clist may point to a valid context initialized with sysctl_ctx_init(). 45663212Sabial */ 45763212Sabialstruct sysctl_oid * 45863212Sabialsysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 459219819Sjeff int number, const char *name, int kind, void *arg1, intptr_t arg2, 46070679Sjhb int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) 46163212Sabial{ 46263212Sabial struct sysctl_oid *oidp; 46363212Sabial ssize_t len; 46463978Speter char *newname; 46563212Sabial 46663212Sabial /* You have to hook up somewhere.. */ 46763212Sabial if (parent == NULL) 46863212Sabial return(NULL); 46963212Sabial /* Check if the node already exists, otherwise create it */ 470188232Sjhb SYSCTL_XLOCK(); 47163212Sabial oidp = sysctl_find_oidname(name, parent); 47263212Sabial if (oidp != NULL) { 47363212Sabial if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 47463212Sabial oidp->oid_refcnt++; 47563212Sabial /* Update the context */ 47663212Sabial if (clist != NULL) 47763212Sabial sysctl_ctx_entry_add(clist, oidp); 478188232Sjhb SYSCTL_XUNLOCK(); 47963212Sabial return (oidp); 48063212Sabial } else { 481188232Sjhb SYSCTL_XUNLOCK(); 48263212Sabial printf("can't re-use a leaf (%s)!\n", name); 48363212Sabial return (NULL); 48463212Sabial } 48563212Sabial } 486111119Simp oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 48763212Sabial oidp->oid_parent = parent; 48863212Sabial SLIST_NEXT(oidp, oid_link) = NULL; 48963212Sabial oidp->oid_number = number; 49063212Sabial oidp->oid_refcnt = 1; 49163212Sabial len = strlen(name); 492111119Simp newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 49363978Speter bcopy(name, newname, len + 1); 49463978Speter newname[len] = '\0'; 49563978Speter oidp->oid_name = newname; 49663212Sabial oidp->oid_handler = handler; 49763212Sabial oidp->oid_kind = CTLFLAG_DYN | kind; 49863212Sabial if ((kind & CTLTYPE) == CTLTYPE_NODE) { 49963212Sabial /* Allocate space for children */ 500132776Skan SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list), 501132776Skan M_SYSCTLOID, M_WAITOK)); 50263212Sabial SLIST_INIT(SYSCTL_CHILDREN(oidp)); 503219819Sjeff oidp->oid_arg2 = arg2; 50463212Sabial } else { 50563212Sabial oidp->oid_arg1 = arg1; 50663212Sabial oidp->oid_arg2 = arg2; 50763212Sabial } 50863212Sabial oidp->oid_fmt = fmt; 50988006Sluigi if (descr) { 51088006Sluigi int len = strlen(descr) + 1; 511141433Sphk oidp->oid_descr = malloc(len, M_SYSCTLOID, M_WAITOK); 512141433Sphk if (oidp->oid_descr) 513141433Sphk strcpy((char *)(uintptr_t)(const void *)oidp->oid_descr, descr); 51488006Sluigi } 51563212Sabial /* Update the context, if used */ 51663212Sabial if (clist != NULL) 51763212Sabial sysctl_ctx_entry_add(clist, oidp); 51863212Sabial /* Register this oid */ 51963212Sabial sysctl_register_oid(oidp); 520188232Sjhb SYSCTL_XUNLOCK(); 52163212Sabial return (oidp); 52263212Sabial} 52363212Sabial 52463212Sabial/* 525174113Speter * Rename an existing oid. 526174113Speter */ 527174113Spetervoid 528174113Spetersysctl_rename_oid(struct sysctl_oid *oidp, const char *name) 529174113Speter{ 530174113Speter ssize_t len; 531174113Speter char *newname; 532174113Speter void *oldname; 533174113Speter 534174113Speter len = strlen(name); 535174113Speter newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 536174113Speter bcopy(name, newname, len + 1); 537174113Speter newname[len] = '\0'; 538188232Sjhb SYSCTL_XLOCK(); 539188232Sjhb oldname = (void *)(uintptr_t)(const void *)oidp->oid_name; 540174113Speter oidp->oid_name = newname; 541188232Sjhb SYSCTL_XUNLOCK(); 542174113Speter free(oldname, M_SYSCTLOID); 543174113Speter} 544174113Speter 545174113Speter/* 546126319Sdes * Reparent an existing oid. 547126319Sdes */ 548126319Sdesint 549126319Sdessysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent) 550126319Sdes{ 551126319Sdes struct sysctl_oid *oidp; 552126319Sdes 553188232Sjhb SYSCTL_XLOCK(); 554188232Sjhb if (oid->oid_parent == parent) { 555188232Sjhb SYSCTL_XUNLOCK(); 556126319Sdes return (0); 557188232Sjhb } 558126319Sdes oidp = sysctl_find_oidname(oid->oid_name, parent); 559188232Sjhb if (oidp != NULL) { 560188232Sjhb SYSCTL_XUNLOCK(); 561126319Sdes return (EEXIST); 562188232Sjhb } 563126319Sdes sysctl_unregister_oid(oid); 564126319Sdes oid->oid_parent = parent; 565126319Sdes oid->oid_number = OID_AUTO; 566126319Sdes sysctl_register_oid(oid); 567188232Sjhb SYSCTL_XUNLOCK(); 568126319Sdes return (0); 569126319Sdes} 570126319Sdes 571126319Sdes/* 57244078Sdfr * Register the kernel's oids on startup. 57344078Sdfr */ 57478161SpeterSET_DECLARE(sysctl_set, struct sysctl_oid); 57512152Sphk 57680338Sroamstatic void 57780338Sroamsysctl_register_all(void *arg) 57838869Sbde{ 57978161Speter struct sysctl_oid **oidp; 58078161Speter 581192125Sjhb sx_init(&sysctlmemlock, "sysctl mem"); 58293625Srwatson SYSCTL_INIT(); 583188232Sjhb SYSCTL_XLOCK(); 58478161Speter SET_FOREACH(oidp, sysctl_set) 58578161Speter sysctl_register_oid(*oidp); 586188232Sjhb SYSCTL_XUNLOCK(); 58738869Sbde} 58844078SdfrSYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); 58944078Sdfr 59012623Sphk/* 59112623Sphk * "Staff-functions" 59212623Sphk * 59312650Sphk * These functions implement a presently undocumented interface 59412650Sphk * used by the sysctl program to walk the tree, and get the type 59512650Sphk * so it can print the value. 59612650Sphk * This interface is under work and consideration, and should probably 59712650Sphk * be killed with a big axe by the first person who can find the time. 59812650Sphk * (be aware though, that the proper interface isn't as obvious as it 59912650Sphk * may seem, there are various conflicting requirements. 60012650Sphk * 60112623Sphk * {0,0} printf the entire MIB-tree. 60212623Sphk * {0,1,...} return the name of the "..." OID. 60342467Sphk * {0,2,...} return the next OID. 60412623Sphk * {0,3} return the OID of the name in "new" 60512650Sphk * {0,4,...} return the kind & format info for the "..." OID. 60688006Sluigi * {0,5,...} return the description the "..." OID. 60712623Sphk */ 60812623Sphk 609136999Srwatson#ifdef SYSCTL_DEBUG 61012152Sphkstatic void 61144078Sdfrsysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 61212152Sphk{ 61344078Sdfr int k; 61444078Sdfr struct sysctl_oid *oidp; 61512152Sphk 616216060Smdf SYSCTL_ASSERT_XLOCKED(); 61744078Sdfr SLIST_FOREACH(oidp, l, oid_link) { 61812152Sphk 61912152Sphk for (k=0; k<i; k++) 62012152Sphk printf(" "); 62112152Sphk 62244078Sdfr printf("%d %s ", oidp->oid_number, oidp->oid_name); 62312152Sphk 62412152Sphk printf("%c%c", 62544078Sdfr oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 62644078Sdfr oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 62712152Sphk 62844078Sdfr if (oidp->oid_handler) 62915241Sphk printf(" *Handler"); 63015241Sphk 63144078Sdfr switch (oidp->oid_kind & CTLTYPE) { 63212243Sphk case CTLTYPE_NODE: 63315241Sphk printf(" Node\n"); 63444078Sdfr if (!oidp->oid_handler) { 63512152Sphk sysctl_sysctl_debug_dump_node( 63644078Sdfr oidp->oid_arg1, i+2); 63712152Sphk } 63812152Sphk break; 63912152Sphk case CTLTYPE_INT: printf(" Int\n"); break; 640217616Smdf case CTLTYPE_UINT: printf(" u_int\n"); break; 641217616Smdf case CTLTYPE_LONG: printf(" Long\n"); break; 642217616Smdf case CTLTYPE_ULONG: printf(" u_long\n"); break; 64312152Sphk case CTLTYPE_STRING: printf(" String\n"); break; 644217616Smdf case CTLTYPE_U64: printf(" uint64_t\n"); break; 645217616Smdf case CTLTYPE_S64: printf(" int64_t\n"); break; 64612152Sphk case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 64712152Sphk default: printf("\n"); 64812152Sphk } 64912152Sphk 65012152Sphk } 65112152Sphk} 65212152Sphk 65312152Sphkstatic int 65462573Sphksysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 65512152Sphk{ 65687024Speter int error; 65787024Speter 658164033Srwatson error = priv_check(req->td, PRIV_SYSCTL_DEBUG); 65987024Speter if (error) 660139483Spjd return (error); 661216060Smdf SYSCTL_XLOCK(); 66244078Sdfr sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 663216060Smdf SYSCTL_XUNLOCK(); 664139483Spjd return (ENOENT); 66512152Sphk} 66612152Sphk 66712152SphkSYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD, 66812623Sphk 0, 0, sysctl_sysctl_debug, "-", ""); 669136999Srwatson#endif 67012152Sphk 67112623Sphkstatic int 67262573Sphksysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 67312623Sphk{ 67412623Sphk int *name = (int *) arg1; 67512623Sphk u_int namelen = arg2; 67644078Sdfr int error = 0; 67744078Sdfr struct sysctl_oid *oid; 67844972Sphk struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 67912623Sphk char buf[10]; 68012131Sphk 681216060Smdf SYSCTL_XLOCK(); 68212623Sphk while (namelen) { 68312623Sphk if (!lsp) { 68441514Sarchie snprintf(buf,sizeof(buf),"%d",*name); 68512623Sphk if (req->oldidx) 68612623Sphk error = SYSCTL_OUT(req, ".", 1); 68712623Sphk if (!error) 68812623Sphk error = SYSCTL_OUT(req, buf, strlen(buf)); 68912623Sphk if (error) 690216060Smdf goto out; 69112623Sphk namelen--; 69212623Sphk name++; 69312623Sphk continue; 69412623Sphk } 69544972Sphk lsp2 = 0; 69644078Sdfr SLIST_FOREACH(oid, lsp, oid_link) { 69744078Sdfr if (oid->oid_number != *name) 69812623Sphk continue; 69912131Sphk 70012623Sphk if (req->oldidx) 70112623Sphk error = SYSCTL_OUT(req, ".", 1); 70212623Sphk if (!error) 70344078Sdfr error = SYSCTL_OUT(req, oid->oid_name, 70444078Sdfr strlen(oid->oid_name)); 70512623Sphk if (error) 706216060Smdf goto out; 70712623Sphk 70812623Sphk namelen--; 70912623Sphk name++; 71012623Sphk 71144972Sphk if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 71212623Sphk break; 71312623Sphk 71444078Sdfr if (oid->oid_handler) 71512623Sphk break; 71612623Sphk 717216058Smdf lsp2 = SYSCTL_CHILDREN(oid); 71812623Sphk break; 71912623Sphk } 72044972Sphk lsp = lsp2; 72112623Sphk } 722216060Smdf error = SYSCTL_OUT(req, "", 1); 723216060Smdf out: 724216060Smdf SYSCTL_XUNLOCK(); 725216060Smdf return (error); 72612623Sphk} 72712623Sphk 728141626Sphkstatic SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, ""); 72912623Sphk 73012623Sphkstatic int 73163978Spetersysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 73244078Sdfr int *next, int *len, int level, struct sysctl_oid **oidpp) 73312623Sphk{ 73444078Sdfr struct sysctl_oid *oidp; 73512623Sphk 736216060Smdf SYSCTL_ASSERT_XLOCKED(); 73712623Sphk *len = level; 73844078Sdfr SLIST_FOREACH(oidp, lsp, oid_link) { 73944078Sdfr *next = oidp->oid_number; 74044078Sdfr *oidpp = oidp; 74112623Sphk 742101650Smux if (oidp->oid_kind & CTLFLAG_SKIP) 743101650Smux continue; 744101650Smux 74512623Sphk if (!namelen) { 74644078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 747139483Spjd return (0); 74844078Sdfr if (oidp->oid_handler) 74912623Sphk /* We really should call the handler here...*/ 750139483Spjd return (0); 751216058Smdf lsp = SYSCTL_CHILDREN(oidp); 75263978Speter if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 75344078Sdfr len, level+1, oidpp)) 754139483Spjd return (0); 755111260Srwatson goto emptynode; 75612623Sphk } 75712623Sphk 75844078Sdfr if (oidp->oid_number < *name) 75912623Sphk continue; 76012623Sphk 76144078Sdfr if (oidp->oid_number > *name) { 76244078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 763139483Spjd return (0); 76444078Sdfr if (oidp->oid_handler) 765139483Spjd return (0); 766216058Smdf lsp = SYSCTL_CHILDREN(oidp); 76763978Speter if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 76844078Sdfr next+1, len, level+1, oidpp)) 76912623Sphk return (0); 77015241Sphk goto next; 77112623Sphk } 77244078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 77312623Sphk continue; 77412623Sphk 77544078Sdfr if (oidp->oid_handler) 77612623Sphk continue; 77712623Sphk 778216058Smdf lsp = SYSCTL_CHILDREN(oidp); 77963978Speter if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 78044078Sdfr len, level+1, oidpp)) 78112623Sphk return (0); 78215241Sphk next: 78312623Sphk namelen = 1; 784111260Srwatson emptynode: 78512623Sphk *len = level; 78612623Sphk } 787139483Spjd return (1); 78812623Sphk} 78912623Sphk 79012623Sphkstatic int 79162573Sphksysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 79212623Sphk{ 79312623Sphk int *name = (int *) arg1; 79412623Sphk u_int namelen = arg2; 79512623Sphk int i, j, error; 79612623Sphk struct sysctl_oid *oid; 79744078Sdfr struct sysctl_oid_list *lsp = &sysctl__children; 79812623Sphk int newoid[CTL_MAXNAME]; 79912623Sphk 800216060Smdf SYSCTL_XLOCK(); 80163978Speter i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 802216060Smdf SYSCTL_XUNLOCK(); 80312623Sphk if (i) 804139483Spjd return (ENOENT); 80512650Sphk error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 80612623Sphk return (error); 80712623Sphk} 80812623Sphk 809141626Sphkstatic SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, ""); 81012623Sphk 81112623Sphkstatic int 812189707Sjhbname2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp) 81312623Sphk{ 81444078Sdfr int i; 81544078Sdfr struct sysctl_oid *oidp; 81644078Sdfr struct sysctl_oid_list *lsp = &sysctl__children; 81712623Sphk char *p; 81812623Sphk 819216060Smdf SYSCTL_ASSERT_XLOCKED(); 820186564Sed 82112623Sphk if (!*name) 822139483Spjd return (ENOENT); 82312623Sphk 82412623Sphk p = name + strlen(name) - 1 ; 82512623Sphk if (*p == '.') 82612623Sphk *p = '\0'; 82712623Sphk 82812623Sphk *len = 0; 82912623Sphk 83012623Sphk for (p = name; *p && *p != '.'; p++) 83112623Sphk ; 83212623Sphk i = *p; 83312623Sphk if (i == '.') 83412623Sphk *p = '\0'; 83512623Sphk 83644078Sdfr oidp = SLIST_FIRST(lsp); 83712623Sphk 83844078Sdfr while (oidp && *len < CTL_MAXNAME) { 83944078Sdfr if (strcmp(name, oidp->oid_name)) { 84044078Sdfr oidp = SLIST_NEXT(oidp, oid_link); 84112623Sphk continue; 84212623Sphk } 84344078Sdfr *oid++ = oidp->oid_number; 84412623Sphk (*len)++; 84512623Sphk 84612623Sphk if (!i) { 84744078Sdfr if (oidpp) 84844078Sdfr *oidpp = oidp; 84912623Sphk return (0); 85012623Sphk } 85112623Sphk 85244078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 85312623Sphk break; 85412623Sphk 85544078Sdfr if (oidp->oid_handler) 85612623Sphk break; 85712623Sphk 858216058Smdf lsp = SYSCTL_CHILDREN(oidp); 85944078Sdfr oidp = SLIST_FIRST(lsp); 86012623Sphk name = p+1; 86112623Sphk for (p = name; *p && *p != '.'; p++) 86212623Sphk ; 86312623Sphk i = *p; 86412623Sphk if (i == '.') 86512623Sphk *p = '\0'; 86612623Sphk } 867139483Spjd return (ENOENT); 86812623Sphk} 86912623Sphk 87012623Sphkstatic int 87162573Sphksysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 87212623Sphk{ 87312623Sphk char *p; 874216066Smdf int error, oid[CTL_MAXNAME], len = 0; 87512623Sphk struct sysctl_oid *op = 0; 87612623Sphk 87712623Sphk if (!req->newlen) 878139483Spjd return (ENOENT); 87945140Sphk if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 88045140Sphk return (ENAMETOOLONG); 88112623Sphk 882111119Simp p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 88312623Sphk 88412623Sphk error = SYSCTL_IN(req, p, req->newlen); 88512623Sphk if (error) { 88612623Sphk free(p, M_SYSCTL); 88712623Sphk return (error); 88812623Sphk } 88912623Sphk 89012623Sphk p [req->newlen] = '\0'; 89112623Sphk 892216060Smdf SYSCTL_XLOCK(); 89312623Sphk error = name2oid(p, oid, &len, &op); 894216060Smdf SYSCTL_XUNLOCK(); 89512623Sphk 89612623Sphk free(p, M_SYSCTL); 89712623Sphk 89812623Sphk if (error) 89912623Sphk return (error); 90012623Sphk 90112650Sphk error = SYSCTL_OUT(req, oid, len * sizeof *oid); 90212623Sphk return (error); 90312623Sphk} 90412623Sphk 905217555SmdfSYSCTL_PROC(_sysctl, 3, name2oid, 906217555Smdf CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, 907187864Sed 0, 0, sysctl_sysctl_name2oid, "I", ""); 90812623Sphk 90912623Sphkstatic int 91062573Sphksysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 91112623Sphk{ 91244078Sdfr struct sysctl_oid *oid; 91353977Sgreen int error; 91412623Sphk 915216060Smdf SYSCTL_XLOCK(); 91653977Sgreen error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 91753977Sgreen if (error) 918216060Smdf goto out; 91912623Sphk 920216060Smdf if (oid->oid_fmt == NULL) { 921216060Smdf error = ENOENT; 922216060Smdf goto out; 923216060Smdf } 92453977Sgreen error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 92553977Sgreen if (error) 926216060Smdf goto out; 92753977Sgreen error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 928216060Smdf out: 929216060Smdf SYSCTL_XUNLOCK(); 93012650Sphk return (error); 93112623Sphk} 93212623Sphk 93342467Sphk 934187864Sedstatic SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD|CTLFLAG_MPSAFE, 935187864Sed sysctl_sysctl_oidfmt, ""); 93612623Sphk 93788006Sluigistatic int 93888006Sluigisysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 93988006Sluigi{ 94088006Sluigi struct sysctl_oid *oid; 94188006Sluigi int error; 94288006Sluigi 943216060Smdf SYSCTL_XLOCK(); 94488006Sluigi error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 94588006Sluigi if (error) 946216060Smdf goto out; 94788006Sluigi 948216060Smdf if (oid->oid_descr == NULL) { 949216060Smdf error = ENOENT; 950216060Smdf goto out; 951216060Smdf } 952141433Sphk error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1); 953216060Smdf out: 954216060Smdf SYSCTL_XUNLOCK(); 95588006Sluigi return (error); 95688006Sluigi} 95788006Sluigi 958141626Sphkstatic SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, ""); 95988006Sluigi 96012243Sphk/* 96112623Sphk * Default "handler" functions. 96212623Sphk */ 96312623Sphk 96412623Sphk/* 96542095Sdfr * Handle an int, signed or unsigned. 96612243Sphk * Two cases: 96712243Sphk * a variable: point arg1 at it. 96812243Sphk * a constant: pass it in arg2. 96912243Sphk */ 97012243Sphk 97111865Sphkint 97262573Sphksysctl_handle_int(SYSCTL_HANDLER_ARGS) 97311863Sphk{ 974100833Struckman int tmpout, error = 0; 97511863Sphk 976100833Struckman /* 977100833Struckman * Attempt to get a coherent snapshot by making a copy of the data. 978100833Struckman */ 97912243Sphk if (arg1) 980100833Struckman tmpout = *(int *)arg1; 98120506Sbde else 982100833Struckman tmpout = arg2; 983100833Struckman error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 98411863Sphk 98512243Sphk if (error || !req->newptr) 98612243Sphk return (error); 98711863Sphk 98812243Sphk if (!arg1) 98912243Sphk error = EPERM; 99012243Sphk else 99112243Sphk error = SYSCTL_IN(req, arg1, sizeof(int)); 99212243Sphk return (error); 99311863Sphk} 99411863Sphk 99512243Sphk/* 996155758Sandre * Based on on sysctl_handle_int() convert milliseconds into ticks. 997195699Srwatson * Note: this is used by TCP. 998155758Sandre */ 999155758Sandre 1000155758Sandreint 1001155758Sandresysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS) 1002155758Sandre{ 1003155758Sandre int error, s, tt; 1004155758Sandre 1005191688Szec tt = *(int *)arg1; 1006155758Sandre s = (int)((int64_t)tt * 1000 / hz); 1007155758Sandre 1008155758Sandre error = sysctl_handle_int(oidp, &s, 0, req); 1009155758Sandre if (error || !req->newptr) 1010155758Sandre return (error); 1011155758Sandre 1012155758Sandre tt = (int)((int64_t)s * hz / 1000); 1013155758Sandre if (tt < 1) 1014155758Sandre return (EINVAL); 1015155758Sandre 1016191688Szec *(int *)arg1 = tt; 1017155758Sandre return (0); 1018155758Sandre} 1019155758Sandre 1020155758Sandre 1021155758Sandre/* 102245140Sphk * Handle a long, signed or unsigned. arg1 points to it. 102338517Sdfr */ 102438517Sdfr 102538517Sdfrint 102662573Sphksysctl_handle_long(SYSCTL_HANDLER_ARGS) 102738517Sdfr{ 102838517Sdfr int error = 0; 1029136404Speter long tmplong; 1030136404Speter#ifdef SCTL_MASK32 1031136404Speter int tmpint; 1032136404Speter#endif 103338517Sdfr 1034100833Struckman /* 1035100833Struckman * Attempt to get a coherent snapshot by making a copy of the data. 1036100833Struckman */ 103745140Sphk if (!arg1) 103845140Sphk return (EINVAL); 1039136404Speter tmplong = *(long *)arg1; 1040136404Speter#ifdef SCTL_MASK32 1041136404Speter if (req->flags & SCTL_MASK32) { 1042136404Speter tmpint = tmplong; 1043136404Speter error = SYSCTL_OUT(req, &tmpint, sizeof(int)); 1044136404Speter } else 1045136404Speter#endif 1046136404Speter error = SYSCTL_OUT(req, &tmplong, sizeof(long)); 104738517Sdfr 104838517Sdfr if (error || !req->newptr) 104938517Sdfr return (error); 105038517Sdfr 1051136404Speter#ifdef SCTL_MASK32 1052136404Speter if (req->flags & SCTL_MASK32) { 1053136404Speter error = SYSCTL_IN(req, &tmpint, sizeof(int)); 1054136404Speter *(long *)arg1 = (long)tmpint; 1055136404Speter } else 1056136404Speter#endif 1057136404Speter error = SYSCTL_IN(req, arg1, sizeof(long)); 105838517Sdfr return (error); 105938517Sdfr} 106038517Sdfr 106138517Sdfr/* 1062170288Sdwmalone * Handle a 64 bit int, signed or unsigned. arg1 points to it. 1063170288Sdwmalone */ 1064170288Sdwmaloneint 1065217616Smdfsysctl_handle_64(SYSCTL_HANDLER_ARGS) 1066170288Sdwmalone{ 1067170288Sdwmalone int error = 0; 1068170288Sdwmalone uint64_t tmpout; 1069170288Sdwmalone 1070170288Sdwmalone /* 1071170288Sdwmalone * Attempt to get a coherent snapshot by making a copy of the data. 1072170288Sdwmalone */ 1073170288Sdwmalone if (!arg1) 1074170288Sdwmalone return (EINVAL); 1075170288Sdwmalone tmpout = *(uint64_t *)arg1; 1076170288Sdwmalone error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t)); 1077170288Sdwmalone 1078170288Sdwmalone if (error || !req->newptr) 1079170288Sdwmalone return (error); 1080170288Sdwmalone 1081170288Sdwmalone error = SYSCTL_IN(req, arg1, sizeof(uint64_t)); 1082170288Sdwmalone return (error); 1083170288Sdwmalone} 1084170288Sdwmalone 1085170288Sdwmalone/* 108612243Sphk * Handle our generic '\0' terminated 'C' string. 108712243Sphk * Two cases: 108812243Sphk * a variable string: point arg1 at it, arg2 is max length. 108912243Sphk * a constant string: point arg1 at it, arg2 is zero. 109012243Sphk */ 109112243Sphk 109211865Sphkint 109362573Sphksysctl_handle_string(SYSCTL_HANDLER_ARGS) 109411863Sphk{ 109512243Sphk int error=0; 1096100833Struckman char *tmparg; 1097100833Struckman size_t outlen; 109811863Sphk 1099100833Struckman /* 1100100833Struckman * Attempt to get a coherent snapshot by copying to a 1101100833Struckman * temporary kernel buffer. 1102100833Struckman */ 1103100833Struckmanretry: 1104100833Struckman outlen = strlen((char *)arg1)+1; 1105111119Simp tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); 1106105354Srobert 1107105354Srobert if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { 1108100833Struckman free(tmparg, M_SYSCTLTMP); 1109100833Struckman goto retry; 1110100833Struckman } 1111105354Srobert 1112100833Struckman error = SYSCTL_OUT(req, tmparg, outlen); 1113100833Struckman free(tmparg, M_SYSCTLTMP); 111411863Sphk 111545140Sphk if (error || !req->newptr) 111612243Sphk return (error); 111711863Sphk 111845140Sphk if ((req->newlen - req->newidx) >= arg2) { 111945140Sphk error = EINVAL; 112012243Sphk } else { 112112243Sphk arg2 = (req->newlen - req->newidx); 112212243Sphk error = SYSCTL_IN(req, arg1, arg2); 112312243Sphk ((char *)arg1)[arg2] = '\0'; 112411863Sphk } 112512131Sphk 112612131Sphk return (error); 112711863Sphk} 112811863Sphk 112912243Sphk/* 113012243Sphk * Handle any kind of opaque data. 113112243Sphk * arg1 points to it, arg2 is the size. 113212243Sphk */ 113312243Sphk 113411865Sphkint 113562573Sphksysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 113611863Sphk{ 1137120803Sbms int error, tries; 1138120803Sbms u_int generation; 1139120813Sbms struct sysctl_req req2; 114012243Sphk 1141100833Struckman /* 1142120803Sbms * Attempt to get a coherent snapshot, by using the thread 1143120803Sbms * pre-emption counter updated from within mi_switch() to 1144120803Sbms * determine if we were pre-empted during a bcopy() or 1145120803Sbms * copyout(). Make 3 attempts at doing this before giving up. 1146120803Sbms * If we encounter an error, stop immediately. 1147100833Struckman */ 1148120803Sbms tries = 0; 1149120813Sbms req2 = *req; 1150120813Sbmsretry: 1151120813Sbms generation = curthread->td_generation; 1152120813Sbms error = SYSCTL_OUT(req, arg1, arg2); 1153120813Sbms if (error) 1154120813Sbms return (error); 1155120813Sbms tries++; 1156120813Sbms if (generation != curthread->td_generation && tries < 3) { 1157120813Sbms *req = req2; 1158120813Sbms goto retry; 1159120813Sbms } 116012243Sphk 116112243Sphk error = SYSCTL_IN(req, arg1, arg2); 116212243Sphk 116312243Sphk return (error); 116412243Sphk} 116512243Sphk 116612260Sphk/* 116712260Sphk * Transfer functions to/from kernel space. 116812260Sphk * XXX: rather untested at this point 116912260Sphk */ 117012260Sphkstatic int 117138517Sdfrsysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 117212243Sphk{ 117338517Sdfr size_t i = 0; 117412260Sphk 117512260Sphk if (req->oldptr) { 117638517Sdfr i = l; 117773971Stmm if (req->oldlen <= req->oldidx) 117873971Stmm i = 0; 117973971Stmm else 118073971Stmm if (i > req->oldlen - req->oldidx) 118173971Stmm i = req->oldlen - req->oldidx; 118212260Sphk if (i > 0) 118317971Sbde bcopy(p, (char *)req->oldptr + req->oldidx, i); 118412243Sphk } 1185192144Skib req->oldidx += l; 118616282Snate if (req->oldptr && i != l) 118711863Sphk return (ENOMEM); 118812260Sphk return (0); 118912243Sphk} 119012243Sphk 119112260Sphkstatic int 119238517Sdfrsysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 119312243Sphk{ 119412260Sphk if (!req->newptr) 1195139483Spjd return (0); 119612260Sphk if (req->newlen - req->newidx < l) 119711863Sphk return (EINVAL); 119817971Sbde bcopy((char *)req->newptr + req->newidx, p, l); 119912243Sphk req->newidx += l; 120012131Sphk return (0); 120111863Sphk} 120211863Sphk 120316282Snateint 120483366Sjuliankernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1205136404Speter size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags) 120616282Snate{ 120716282Snate int error = 0; 120816282Snate struct sysctl_req req; 120916282Snate 121016282Snate bzero(&req, sizeof req); 121116282Snate 121286183Srwatson req.td = td; 1213136404Speter req.flags = flags; 121416282Snate 121516282Snate if (oldlenp) { 121616282Snate req.oldlen = *oldlenp; 121716282Snate } 1218127052Struckman req.validlen = req.oldlen; 121916282Snate 122016282Snate if (old) { 122116282Snate req.oldptr= old; 122216282Snate } 122316282Snate 122477646Sdd if (new != NULL) { 122516282Snate req.newlen = newlen; 122616282Snate req.newptr = new; 122716282Snate } 122816282Snate 122916282Snate req.oldfunc = sysctl_old_kernel; 123016282Snate req.newfunc = sysctl_new_kernel; 1231217915Smdf req.lock = REQ_UNWIRED; 123216282Snate 1233216060Smdf SYSCTL_XLOCK(); 123416282Snate error = sysctl_root(0, name, namelen, &req); 1235216060Smdf SYSCTL_XUNLOCK(); 1236120813Sbms 1237127052Struckman if (req.lock == REQ_WIRED && req.validlen > 0) 1238127052Struckman vsunlock(req.oldptr, req.validlen); 123916282Snate 124016282Snate if (error && error != ENOMEM) 124116282Snate return (error); 124216282Snate 124316282Snate if (retval) { 1244127052Struckman if (req.oldptr && req.oldidx > req.validlen) 1245127052Struckman *retval = req.validlen; 124616282Snate else 124716282Snate *retval = req.oldidx; 124816282Snate } 124916282Snate return (error); 125016282Snate} 125116282Snate 125276834Sjlemonint 125383366Sjuliankernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 1254136404Speter void *new, size_t newlen, size_t *retval, int flags) 125576834Sjlemon{ 125676834Sjlemon int oid[CTL_MAXNAME]; 125778620Smjacob size_t oidlen, plen; 125878620Smjacob int error; 125976834Sjlemon 126076834Sjlemon oid[0] = 0; /* sysctl internal magic */ 126176834Sjlemon oid[1] = 3; /* name2oid */ 126276834Sjlemon oidlen = sizeof(oid); 126376834Sjlemon 126483366Sjulian error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1265136404Speter (void *)name, strlen(name), &plen, flags); 126676834Sjlemon if (error) 126776834Sjlemon return (error); 126876834Sjlemon 126983366Sjulian error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1270136404Speter new, newlen, retval, flags); 127176834Sjlemon return (error); 127276834Sjlemon} 127376834Sjlemon 127412260Sphk/* 127512260Sphk * Transfer function to/from user space. 127612260Sphk */ 127712260Sphkstatic int 127838517Sdfrsysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 127912243Sphk{ 128038517Sdfr int error = 0; 1281126253Struckman size_t i, len, origidx; 128212243Sphk 1283126253Struckman origidx = req->oldidx; 1284192144Skib req->oldidx += l; 1285192144Skib if (req->oldptr == NULL) 1286126253Struckman return (0); 1287148864Scsjp /* 1288148864Scsjp * If we have not wired the user supplied buffer and we are currently 1289148864Scsjp * holding locks, drop a witness warning, as it's possible that 1290148864Scsjp * write operations to the user page can sleep. 1291148864Scsjp */ 1292148864Scsjp if (req->lock != REQ_WIRED) 1293111883Sjhb WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1294111883Sjhb "sysctl_old_user()"); 1295126253Struckman i = l; 1296127052Struckman len = req->validlen; 1297126253Struckman if (len <= origidx) 1298126253Struckman i = 0; 1299126253Struckman else { 1300126253Struckman if (i > len - origidx) 1301126253Struckman i = len - origidx; 1302126253Struckman error = copyout(p, (char *)req->oldptr + origidx, i); 130312260Sphk } 130412243Sphk if (error) 130512243Sphk return (error); 1306126253Struckman if (i < l) 130712243Sphk return (ENOMEM); 130812260Sphk return (0); 130912243Sphk} 131012243Sphk 131112260Sphkstatic int 131238517Sdfrsysctl_new_user(struct sysctl_req *req, void *p, size_t l) 131312243Sphk{ 131412285Sphk int error; 131512260Sphk 131612260Sphk if (!req->newptr) 1317139483Spjd return (0); 131812260Sphk if (req->newlen - req->newidx < l) 131912243Sphk return (EINVAL); 1320148873Scsjp WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1321148873Scsjp "sysctl_new_user()"); 132217971Sbde error = copyin((char *)req->newptr + req->newidx, p, l); 132312243Sphk req->newidx += l; 132412243Sphk return (error); 132512243Sphk} 132612243Sphk 1327100487Struckman/* 1328100487Struckman * Wire the user space destination buffer. If set to a value greater than 1329100487Struckman * zero, the len parameter limits the maximum amount of wired memory. 1330100487Struckman */ 1331126253Struckmanint 1332100487Struckmansysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1333100487Struckman{ 1334126253Struckman int ret; 1335192160Sdes size_t wiredlen; 1336126253Struckman 1337126253Struckman wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen; 1338126253Struckman ret = 0; 1339217915Smdf if (req->lock != REQ_WIRED && req->oldptr && 1340120781Sbms req->oldfunc == sysctl_old_user) { 1341127050Struckman if (wiredlen != 0) { 1342127050Struckman ret = vslock(req->oldptr, wiredlen); 1343130327Sgreen if (ret != 0) { 1344130327Sgreen if (ret != ENOMEM) 1345130327Sgreen return (ret); 1346130327Sgreen wiredlen = 0; 1347130327Sgreen } 1348126253Struckman } 1349127050Struckman req->lock = REQ_WIRED; 1350127052Struckman req->validlen = wiredlen; 1351100487Struckman } 1352127050Struckman return (0); 1353100487Struckman} 1354100487Struckman 13551541Srgrimesint 135653977Sgreensysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 135753977Sgreen int *nindx, struct sysctl_req *req) 135812131Sphk{ 1359216059Smdf struct sysctl_oid_list *lsp; 136044078Sdfr struct sysctl_oid *oid; 136153977Sgreen int indx; 136212131Sphk 1363216060Smdf SYSCTL_ASSERT_XLOCKED(); 1364216059Smdf lsp = &sysctl__children; 136512131Sphk indx = 0; 1366216059Smdf while (indx < CTL_MAXNAME) { 1367216059Smdf SLIST_FOREACH(oid, lsp, oid_link) { 1368216059Smdf if (oid->oid_number == name[indx]) 1369216059Smdf break; 1370216059Smdf } 1371216059Smdf if (oid == NULL) 1372216059Smdf return (ENOENT); 1373216059Smdf 1374216059Smdf indx++; 1375216059Smdf if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1376216059Smdf if (oid->oid_handler != NULL || indx == namelen) { 137753977Sgreen *noid = oid; 137853977Sgreen if (nindx != NULL) 137953977Sgreen *nindx = indx; 1380216060Smdf KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 1381216060Smdf ("%s found DYING node %p", __func__, oid)); 138253977Sgreen return (0); 138312131Sphk } 1384216059Smdf lsp = SYSCTL_CHILDREN(oid); 1385216059Smdf } else if (indx == namelen) { 1386216059Smdf *noid = oid; 1387216059Smdf if (nindx != NULL) 1388216059Smdf *nindx = indx; 1389216060Smdf KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 1390216060Smdf ("%s found DYING node %p", __func__, oid)); 1391216059Smdf return (0); 139212131Sphk } else { 1393216059Smdf return (ENOTDIR); 139412131Sphk } 139512131Sphk } 139653977Sgreen return (ENOENT); 139753977Sgreen} 139853977Sgreen 139953977Sgreen/* 140053977Sgreen * Traverse our tree, and find the right node, execute whatever it points 140153977Sgreen * to, and return the resulting error code. 140253977Sgreen */ 140353977Sgreen 1404104094Sphkstatic int 140562573Sphksysctl_root(SYSCTL_HANDLER_ARGS) 140653977Sgreen{ 140753977Sgreen struct sysctl_oid *oid; 1408109246Sdillon int error, indx, lvl; 140953977Sgreen 1410216060Smdf SYSCTL_ASSERT_XLOCKED(); 1411186564Sed 141253977Sgreen error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 141353977Sgreen if (error) 141453977Sgreen return (error); 141553977Sgreen 141653977Sgreen if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 141753977Sgreen /* 141853977Sgreen * You can't call a sysctl when it's a node, but has 141953977Sgreen * no handler. Inform the user that it's a node. 142053977Sgreen * The indx may or may not be the same as namelen. 142153977Sgreen */ 142253977Sgreen if (oid->oid_handler == NULL) 142353977Sgreen return (EISDIR); 142453977Sgreen } 142553977Sgreen 142683968Srwatson /* Is this sysctl writable? */ 142783968Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) 142812131Sphk return (EPERM); 142912131Sphk 143092953Srwatson KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 143192953Srwatson 143283968Srwatson /* Is this sysctl sensitive to securelevels? */ 143383968Srwatson if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 1434109246Sdillon lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 1435109246Sdillon error = securelevel_gt(req->td->td_ucred, lvl); 143692953Srwatson if (error) 143792953Srwatson return (error); 143883968Srwatson } 143912910Sphk 144083968Srwatson /* Is this sysctl writable by only privileged users? */ 144183968Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 1442196176Sbz int priv; 1443196176Sbz 144492953Srwatson if (oid->oid_kind & CTLFLAG_PRISON) 1445196176Sbz priv = PRIV_SYSCTL_WRITEJAIL; 1446196176Sbz#ifdef VIMAGE 1447196176Sbz else if ((oid->oid_kind & CTLFLAG_VNET) && 1448196176Sbz prison_owns_vnet(req->td->td_ucred)) 1449196176Sbz priv = PRIV_SYSCTL_WRITEJAIL; 1450196176Sbz#endif 145192953Srwatson else 1452196176Sbz priv = PRIV_SYSCTL_WRITE; 1453196176Sbz error = priv_check(req->td, priv); 145492953Srwatson if (error) 145592953Srwatson return (error); 145683968Srwatson } 145783968Srwatson 145844078Sdfr if (!oid->oid_handler) 1459139483Spjd return (EINVAL); 146012131Sphk 1461126121Spjd if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1462132776Skan arg1 = (int *)arg1 + indx; 1463126121Spjd arg2 -= indx; 1464126121Spjd } else { 1465126121Spjd arg1 = oid->oid_arg1; 1466126121Spjd arg2 = oid->oid_arg2; 1467126121Spjd } 1468126121Spjd#ifdef MAC 1469172930Srwatson error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2, 1470126121Spjd req); 1471126121Spjd if (error != 0) 1472126121Spjd return (error); 1473126121Spjd#endif 1474216060Smdf oid->oid_running++; 1475216060Smdf SYSCTL_XUNLOCK(); 1476216060Smdf 1477187656Sjhb if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1478187656Sjhb mtx_lock(&Giant); 1479126121Spjd error = oid->oid_handler(oid, arg1, arg2, req); 1480187656Sjhb if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1481187656Sjhb mtx_unlock(&Giant); 1482126121Spjd 1483216060Smdf KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error); 1484216060Smdf 1485216060Smdf SYSCTL_XLOCK(); 1486216060Smdf oid->oid_running--; 1487216060Smdf if (oid->oid_running == 0 && (oid->oid_kind & CTLFLAG_DYING) != 0) 1488216060Smdf wakeup(&oid->oid_running); 148953977Sgreen return (error); 149012131Sphk} 149112131Sphk 149212221Sbde#ifndef _SYS_SYSPROTO_H_ 149312171Sphkstruct sysctl_args { 149412171Sphk int *name; 149512171Sphk u_int namelen; 149612171Sphk void *old; 149712171Sphk size_t *oldlenp; 149812171Sphk void *new; 149912171Sphk size_t newlen; 150012171Sphk}; 150112221Sbde#endif 150212131Sphkint 150383366Sjulian__sysctl(struct thread *td, struct sysctl_args *uap) 15041541Srgrimes{ 1505188232Sjhb int error, i, name[CTL_MAXNAME]; 150638517Sdfr size_t j; 15071541Srgrimes 15081541Srgrimes if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 15091541Srgrimes return (EINVAL); 151011863Sphk 15113308Sphk error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 15123308Sphk if (error) 15131541Srgrimes return (error); 15141541Srgrimes 151583366Sjulian error = userland_sysctl(td, name, uap->namelen, 151612171Sphk uap->old, uap->oldlenp, 0, 1517136404Speter uap->new, uap->newlen, &j, 0); 151812260Sphk if (error && error != ENOMEM) 1519186564Sed return (error); 1520186664Sed if (uap->oldlenp) { 1521188232Sjhb i = copyout(&j, uap->oldlenp, sizeof(j)); 1522186664Sed if (i) 1523186664Sed return (i); 1524186664Sed } 152512260Sphk return (error); 152612171Sphk} 152712171Sphk 152812171Sphk/* 152912171Sphk * This is used from various compatibility syscalls too. That's why name 153012171Sphk * must be in kernel space. 153112171Sphk */ 153212171Sphkint 153383366Sjulianuserland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1534136404Speter size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval, 1535136404Speter int flags) 153612171Sphk{ 1537192125Sjhb int error = 0, memlocked; 1538127052Struckman struct sysctl_req req; 153912171Sphk 154012243Sphk bzero(&req, sizeof req); 154112243Sphk 154286183Srwatson req.td = td; 1543136404Speter req.flags = flags; 154412285Sphk 154512171Sphk if (oldlenp) { 154612171Sphk if (inkernel) { 154712243Sphk req.oldlen = *oldlenp; 154812171Sphk } else { 154912260Sphk error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 155012171Sphk if (error) 155112171Sphk return (error); 155212171Sphk } 155312171Sphk } 1554127052Struckman req.validlen = req.oldlen; 155512171Sphk 155612243Sphk if (old) { 155752644Sphk if (!useracc(old, req.oldlen, VM_PROT_WRITE)) 155812243Sphk return (EFAULT); 155912243Sphk req.oldptr= old; 156012243Sphk } 156112131Sphk 156277646Sdd if (new != NULL) { 1563172038Srwatson if (!useracc(new, newlen, VM_PROT_READ)) 156412243Sphk return (EFAULT); 156512243Sphk req.newlen = newlen; 156612243Sphk req.newptr = new; 156711863Sphk } 156812131Sphk 156912243Sphk req.oldfunc = sysctl_old_user; 157012243Sphk req.newfunc = sysctl_new_user; 1571217915Smdf req.lock = REQ_UNWIRED; 157211863Sphk 1573189707Sjhb#ifdef KTRACE 1574189707Sjhb if (KTRPOINT(curthread, KTR_SYSCTL)) 1575189707Sjhb ktrsysctl(name, namelen); 1576189707Sjhb#endif 1577192125Sjhb 1578192125Sjhb if (req.oldlen > PAGE_SIZE) { 1579192125Sjhb memlocked = 1; 1580192125Sjhb sx_xlock(&sysctlmemlock); 1581192125Sjhb } else 1582192125Sjhb memlocked = 0; 1583194252Sjamie CURVNET_SET(TD_TO_VNET(td)); 158412429Sphk 1585185983Skib for (;;) { 1586127052Struckman req.oldidx = 0; 1587127052Struckman req.newidx = 0; 1588216060Smdf SYSCTL_XLOCK(); 1589127052Struckman error = sysctl_root(0, name, namelen, &req); 1590216060Smdf SYSCTL_XUNLOCK(); 1591185983Skib if (error != EAGAIN) 1592185983Skib break; 1593221829Smdf kern_yield(PRI_USER); 1594185983Skib } 159512243Sphk 1596186564Sed CURVNET_RESTORE(); 1597186564Sed 1598127052Struckman if (req.lock == REQ_WIRED && req.validlen > 0) 1599127052Struckman vsunlock(req.oldptr, req.validlen); 1600192125Sjhb if (memlocked) 1601192125Sjhb sx_xunlock(&sysctlmemlock); 160212429Sphk 160312260Sphk if (error && error != ENOMEM) 160412260Sphk return (error); 160512260Sphk 160612260Sphk if (retval) { 1607127052Struckman if (req.oldptr && req.oldidx > req.validlen) 1608127052Struckman *retval = req.validlen; 160912260Sphk else 161012260Sphk *retval = req.oldidx; 161111863Sphk } 161212260Sphk return (error); 16131541Srgrimes} 1614212750Smdf 1615212750Smdf/* 1616217916Smdf * Drain into a sysctl struct. The user buffer should be wired if a page 1617217916Smdf * fault would cause issue. 1618212750Smdf */ 1619212750Smdfstatic int 1620212750Smdfsbuf_sysctl_drain(void *arg, const char *data, int len) 1621212750Smdf{ 1622212750Smdf struct sysctl_req *req = arg; 1623212750Smdf int error; 1624212750Smdf 1625212750Smdf error = SYSCTL_OUT(req, data, len); 1626212750Smdf KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 1627212750Smdf return (error == 0 ? len : -error); 1628212750Smdf} 1629212750Smdf 1630212750Smdfstruct sbuf * 1631212750Smdfsbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 1632212750Smdf struct sysctl_req *req) 1633212750Smdf{ 1634212750Smdf 1635212750Smdf s = sbuf_new(s, buf, length, SBUF_FIXEDLEN); 1636212750Smdf sbuf_set_drain(s, sbuf_sysctl_drain, req); 1637212750Smdf return (s); 1638212750Smdf} 1639