kern_sysctl.c revision 216060
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 216060 2010-11-29 18:18:07Z 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 368188232Sjhbstatic int 369188232Sjhbsysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse) 370188232Sjhb{ 37163212Sabial struct sysctl_oid *p; 37263212Sabial int error; 37363212Sabial 374188232Sjhb SYSCTL_ASSERT_XLOCKED(); 37563212Sabial if (oidp == NULL) 37663212Sabial return(EINVAL); 37763212Sabial if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 37863212Sabial printf("can't remove non-dynamic nodes!\n"); 37963212Sabial return (EINVAL); 38063212Sabial } 38163212Sabial /* 38263212Sabial * WARNING: normal method to do this should be through 38363212Sabial * sysctl_ctx_free(). Use recursing as the last resort 38463212Sabial * method to purge your sysctl tree of leftovers... 38563212Sabial * However, if some other code still references these nodes, 38663212Sabial * it will panic. 38763212Sabial */ 38863212Sabial if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 38963212Sabial if (oidp->oid_refcnt == 1) { 39063212Sabial SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) { 39163212Sabial if (!recurse) 39263212Sabial return (ENOTEMPTY); 393188232Sjhb error = sysctl_remove_oid_locked(p, del, 394188232Sjhb recurse); 39563212Sabial if (error) 39663212Sabial return (error); 39763212Sabial } 39863212Sabial if (del) 39963212Sabial free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); 40063212Sabial } 40163212Sabial } 40263212Sabial if (oidp->oid_refcnt > 1 ) { 40363212Sabial oidp->oid_refcnt--; 40463212Sabial } else { 40563212Sabial if (oidp->oid_refcnt == 0) { 40663212Sabial printf("Warning: bad oid_refcnt=%u (%s)!\n", 40763212Sabial oidp->oid_refcnt, oidp->oid_name); 40863212Sabial return (EINVAL); 40963212Sabial } 41063212Sabial sysctl_unregister_oid(oidp); 41163212Sabial if (del) { 412216060Smdf /* 413216060Smdf * Wait for all threads running the handler to drain. 414216060Smdf * This preserves the previous behavior when the 415216060Smdf * sysctl lock was held across a handler invocation, 416216060Smdf * and is necessary for module unload correctness. 417216060Smdf */ 418216060Smdf while (oidp->oid_running > 0) { 419216060Smdf oidp->oid_kind |= CTLFLAG_DYING; 420216060Smdf SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0); 421216060Smdf } 422141433Sphk if (oidp->oid_descr) 423141433Sphk free((void *)(uintptr_t)(const void *)oidp->oid_descr, M_SYSCTLOID); 42463978Speter free((void *)(uintptr_t)(const void *)oidp->oid_name, 42563978Speter M_SYSCTLOID); 42663212Sabial free(oidp, M_SYSCTLOID); 42763212Sabial } 42863212Sabial } 42963212Sabial return (0); 43063212Sabial} 43163212Sabial 43263212Sabial/* 43363212Sabial * Create new sysctls at run time. 43463212Sabial * clist may point to a valid context initialized with sysctl_ctx_init(). 43563212Sabial */ 43663212Sabialstruct sysctl_oid * 43763212Sabialsysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 43870679Sjhb int number, const char *name, int kind, void *arg1, int arg2, 43970679Sjhb int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) 44063212Sabial{ 44163212Sabial struct sysctl_oid *oidp; 44263212Sabial ssize_t len; 44363978Speter char *newname; 44463212Sabial 44563212Sabial /* You have to hook up somewhere.. */ 44663212Sabial if (parent == NULL) 44763212Sabial return(NULL); 44863212Sabial /* Check if the node already exists, otherwise create it */ 449188232Sjhb SYSCTL_XLOCK(); 45063212Sabial oidp = sysctl_find_oidname(name, parent); 45163212Sabial if (oidp != NULL) { 45263212Sabial if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 45363212Sabial oidp->oid_refcnt++; 45463212Sabial /* Update the context */ 45563212Sabial if (clist != NULL) 45663212Sabial sysctl_ctx_entry_add(clist, oidp); 457188232Sjhb SYSCTL_XUNLOCK(); 45863212Sabial return (oidp); 45963212Sabial } else { 460188232Sjhb SYSCTL_XUNLOCK(); 46163212Sabial printf("can't re-use a leaf (%s)!\n", name); 46263212Sabial return (NULL); 46363212Sabial } 46463212Sabial } 465111119Simp oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 46663212Sabial oidp->oid_parent = parent; 46763212Sabial SLIST_NEXT(oidp, oid_link) = NULL; 46863212Sabial oidp->oid_number = number; 46963212Sabial oidp->oid_refcnt = 1; 47063212Sabial len = strlen(name); 471111119Simp newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 47263978Speter bcopy(name, newname, len + 1); 47363978Speter newname[len] = '\0'; 47463978Speter oidp->oid_name = newname; 47563212Sabial oidp->oid_handler = handler; 47663212Sabial oidp->oid_kind = CTLFLAG_DYN | kind; 47763212Sabial if ((kind & CTLTYPE) == CTLTYPE_NODE) { 47863212Sabial /* Allocate space for children */ 479132776Skan SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list), 480132776Skan M_SYSCTLOID, M_WAITOK)); 48163212Sabial SLIST_INIT(SYSCTL_CHILDREN(oidp)); 48263212Sabial } else { 48363212Sabial oidp->oid_arg1 = arg1; 48463212Sabial oidp->oid_arg2 = arg2; 48563212Sabial } 48663212Sabial oidp->oid_fmt = fmt; 48788006Sluigi if (descr) { 48888006Sluigi int len = strlen(descr) + 1; 489141433Sphk oidp->oid_descr = malloc(len, M_SYSCTLOID, M_WAITOK); 490141433Sphk if (oidp->oid_descr) 491141433Sphk strcpy((char *)(uintptr_t)(const void *)oidp->oid_descr, descr); 49288006Sluigi } 49363212Sabial /* Update the context, if used */ 49463212Sabial if (clist != NULL) 49563212Sabial sysctl_ctx_entry_add(clist, oidp); 49663212Sabial /* Register this oid */ 49763212Sabial sysctl_register_oid(oidp); 498188232Sjhb SYSCTL_XUNLOCK(); 49963212Sabial return (oidp); 50063212Sabial} 50163212Sabial 50263212Sabial/* 503174113Speter * Rename an existing oid. 504174113Speter */ 505174113Spetervoid 506174113Spetersysctl_rename_oid(struct sysctl_oid *oidp, const char *name) 507174113Speter{ 508174113Speter ssize_t len; 509174113Speter char *newname; 510174113Speter void *oldname; 511174113Speter 512174113Speter len = strlen(name); 513174113Speter newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 514174113Speter bcopy(name, newname, len + 1); 515174113Speter newname[len] = '\0'; 516188232Sjhb SYSCTL_XLOCK(); 517188232Sjhb oldname = (void *)(uintptr_t)(const void *)oidp->oid_name; 518174113Speter oidp->oid_name = newname; 519188232Sjhb SYSCTL_XUNLOCK(); 520174113Speter free(oldname, M_SYSCTLOID); 521174113Speter} 522174113Speter 523174113Speter/* 524126319Sdes * Reparent an existing oid. 525126319Sdes */ 526126319Sdesint 527126319Sdessysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent) 528126319Sdes{ 529126319Sdes struct sysctl_oid *oidp; 530126319Sdes 531188232Sjhb SYSCTL_XLOCK(); 532188232Sjhb if (oid->oid_parent == parent) { 533188232Sjhb SYSCTL_XUNLOCK(); 534126319Sdes return (0); 535188232Sjhb } 536126319Sdes oidp = sysctl_find_oidname(oid->oid_name, parent); 537188232Sjhb if (oidp != NULL) { 538188232Sjhb SYSCTL_XUNLOCK(); 539126319Sdes return (EEXIST); 540188232Sjhb } 541126319Sdes sysctl_unregister_oid(oid); 542126319Sdes oid->oid_parent = parent; 543126319Sdes oid->oid_number = OID_AUTO; 544126319Sdes sysctl_register_oid(oid); 545188232Sjhb SYSCTL_XUNLOCK(); 546126319Sdes return (0); 547126319Sdes} 548126319Sdes 549126319Sdes/* 55044078Sdfr * Register the kernel's oids on startup. 55144078Sdfr */ 55278161SpeterSET_DECLARE(sysctl_set, struct sysctl_oid); 55312152Sphk 55480338Sroamstatic void 55580338Sroamsysctl_register_all(void *arg) 55638869Sbde{ 55778161Speter struct sysctl_oid **oidp; 55878161Speter 559192125Sjhb sx_init(&sysctlmemlock, "sysctl mem"); 56093625Srwatson SYSCTL_INIT(); 561188232Sjhb SYSCTL_XLOCK(); 56278161Speter SET_FOREACH(oidp, sysctl_set) 56378161Speter sysctl_register_oid(*oidp); 564188232Sjhb SYSCTL_XUNLOCK(); 56538869Sbde} 56644078SdfrSYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); 56744078Sdfr 56812623Sphk/* 56912623Sphk * "Staff-functions" 57012623Sphk * 57112650Sphk * These functions implement a presently undocumented interface 57212650Sphk * used by the sysctl program to walk the tree, and get the type 57312650Sphk * so it can print the value. 57412650Sphk * This interface is under work and consideration, and should probably 57512650Sphk * be killed with a big axe by the first person who can find the time. 57612650Sphk * (be aware though, that the proper interface isn't as obvious as it 57712650Sphk * may seem, there are various conflicting requirements. 57812650Sphk * 57912623Sphk * {0,0} printf the entire MIB-tree. 58012623Sphk * {0,1,...} return the name of the "..." OID. 58142467Sphk * {0,2,...} return the next OID. 58212623Sphk * {0,3} return the OID of the name in "new" 58312650Sphk * {0,4,...} return the kind & format info for the "..." OID. 58488006Sluigi * {0,5,...} return the description the "..." OID. 58512623Sphk */ 58612623Sphk 587136999Srwatson#ifdef SYSCTL_DEBUG 58812152Sphkstatic void 58944078Sdfrsysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 59012152Sphk{ 59144078Sdfr int k; 59244078Sdfr struct sysctl_oid *oidp; 59312152Sphk 594216060Smdf SYSCTL_ASSERT_XLOCKED(); 59544078Sdfr SLIST_FOREACH(oidp, l, oid_link) { 59612152Sphk 59712152Sphk for (k=0; k<i; k++) 59812152Sphk printf(" "); 59912152Sphk 60044078Sdfr printf("%d %s ", oidp->oid_number, oidp->oid_name); 60112152Sphk 60212152Sphk printf("%c%c", 60344078Sdfr oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 60444078Sdfr oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 60512152Sphk 60644078Sdfr if (oidp->oid_handler) 60715241Sphk printf(" *Handler"); 60815241Sphk 60944078Sdfr switch (oidp->oid_kind & CTLTYPE) { 61012243Sphk case CTLTYPE_NODE: 61115241Sphk printf(" Node\n"); 61244078Sdfr if (!oidp->oid_handler) { 61312152Sphk sysctl_sysctl_debug_dump_node( 61444078Sdfr oidp->oid_arg1, i+2); 61512152Sphk } 61612152Sphk break; 61712152Sphk case CTLTYPE_INT: printf(" Int\n"); break; 61812152Sphk case CTLTYPE_STRING: printf(" String\n"); break; 61912152Sphk case CTLTYPE_QUAD: printf(" Quad\n"); break; 62012152Sphk case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 62112152Sphk default: printf("\n"); 62212152Sphk } 62312152Sphk 62412152Sphk } 62512152Sphk} 62612152Sphk 62712152Sphkstatic int 62862573Sphksysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 62912152Sphk{ 63087024Speter int error; 63187024Speter 632164033Srwatson error = priv_check(req->td, PRIV_SYSCTL_DEBUG); 63387024Speter if (error) 634139483Spjd return (error); 635216060Smdf SYSCTL_XLOCK(); 63644078Sdfr sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 637216060Smdf SYSCTL_XUNLOCK(); 638139483Spjd return (ENOENT); 63912152Sphk} 64012152Sphk 64112152SphkSYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD, 64212623Sphk 0, 0, sysctl_sysctl_debug, "-", ""); 643136999Srwatson#endif 64412152Sphk 64512623Sphkstatic int 64662573Sphksysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 64712623Sphk{ 64812623Sphk int *name = (int *) arg1; 64912623Sphk u_int namelen = arg2; 65044078Sdfr int error = 0; 65144078Sdfr struct sysctl_oid *oid; 65244972Sphk struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 65312623Sphk char buf[10]; 65412131Sphk 655216060Smdf SYSCTL_XLOCK(); 65612623Sphk while (namelen) { 65712623Sphk if (!lsp) { 65841514Sarchie snprintf(buf,sizeof(buf),"%d",*name); 65912623Sphk if (req->oldidx) 66012623Sphk error = SYSCTL_OUT(req, ".", 1); 66112623Sphk if (!error) 66212623Sphk error = SYSCTL_OUT(req, buf, strlen(buf)); 66312623Sphk if (error) 664216060Smdf goto out; 66512623Sphk namelen--; 66612623Sphk name++; 66712623Sphk continue; 66812623Sphk } 66944972Sphk lsp2 = 0; 67044078Sdfr SLIST_FOREACH(oid, lsp, oid_link) { 67144078Sdfr if (oid->oid_number != *name) 67212623Sphk continue; 67312131Sphk 67412623Sphk if (req->oldidx) 67512623Sphk error = SYSCTL_OUT(req, ".", 1); 67612623Sphk if (!error) 67744078Sdfr error = SYSCTL_OUT(req, oid->oid_name, 67844078Sdfr strlen(oid->oid_name)); 67912623Sphk if (error) 680216060Smdf goto out; 68112623Sphk 68212623Sphk namelen--; 68312623Sphk name++; 68412623Sphk 68544972Sphk if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 68612623Sphk break; 68712623Sphk 68844078Sdfr if (oid->oid_handler) 68912623Sphk break; 69012623Sphk 691216058Smdf lsp2 = SYSCTL_CHILDREN(oid); 69212623Sphk break; 69312623Sphk } 69444972Sphk lsp = lsp2; 69512623Sphk } 696216060Smdf error = SYSCTL_OUT(req, "", 1); 697216060Smdf out: 698216060Smdf SYSCTL_XUNLOCK(); 699216060Smdf return (error); 70012623Sphk} 70112623Sphk 702141626Sphkstatic SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, ""); 70312623Sphk 70412623Sphkstatic int 70563978Spetersysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 70644078Sdfr int *next, int *len, int level, struct sysctl_oid **oidpp) 70712623Sphk{ 70844078Sdfr struct sysctl_oid *oidp; 70912623Sphk 710216060Smdf SYSCTL_ASSERT_XLOCKED(); 71112623Sphk *len = level; 71244078Sdfr SLIST_FOREACH(oidp, lsp, oid_link) { 71344078Sdfr *next = oidp->oid_number; 71444078Sdfr *oidpp = oidp; 71512623Sphk 716101650Smux if (oidp->oid_kind & CTLFLAG_SKIP) 717101650Smux continue; 718101650Smux 71912623Sphk if (!namelen) { 72044078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 721139483Spjd return (0); 72244078Sdfr if (oidp->oid_handler) 72312623Sphk /* We really should call the handler here...*/ 724139483Spjd return (0); 725216058Smdf lsp = SYSCTL_CHILDREN(oidp); 72663978Speter if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 72744078Sdfr len, level+1, oidpp)) 728139483Spjd return (0); 729111260Srwatson goto emptynode; 73012623Sphk } 73112623Sphk 73244078Sdfr if (oidp->oid_number < *name) 73312623Sphk continue; 73412623Sphk 73544078Sdfr if (oidp->oid_number > *name) { 73644078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 737139483Spjd return (0); 73844078Sdfr if (oidp->oid_handler) 739139483Spjd return (0); 740216058Smdf lsp = SYSCTL_CHILDREN(oidp); 74163978Speter if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 74244078Sdfr next+1, len, level+1, oidpp)) 74312623Sphk return (0); 74415241Sphk goto next; 74512623Sphk } 74644078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 74712623Sphk continue; 74812623Sphk 74944078Sdfr if (oidp->oid_handler) 75012623Sphk continue; 75112623Sphk 752216058Smdf lsp = SYSCTL_CHILDREN(oidp); 75363978Speter if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 75444078Sdfr len, level+1, oidpp)) 75512623Sphk return (0); 75615241Sphk next: 75712623Sphk namelen = 1; 758111260Srwatson emptynode: 75912623Sphk *len = level; 76012623Sphk } 761139483Spjd return (1); 76212623Sphk} 76312623Sphk 76412623Sphkstatic int 76562573Sphksysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 76612623Sphk{ 76712623Sphk int *name = (int *) arg1; 76812623Sphk u_int namelen = arg2; 76912623Sphk int i, j, error; 77012623Sphk struct sysctl_oid *oid; 77144078Sdfr struct sysctl_oid_list *lsp = &sysctl__children; 77212623Sphk int newoid[CTL_MAXNAME]; 77312623Sphk 774216060Smdf SYSCTL_XLOCK(); 77563978Speter i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 776216060Smdf SYSCTL_XUNLOCK(); 77712623Sphk if (i) 778139483Spjd return (ENOENT); 77912650Sphk error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 78012623Sphk return (error); 78112623Sphk} 78212623Sphk 783141626Sphkstatic SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, ""); 78412623Sphk 78512623Sphkstatic int 786189707Sjhbname2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp) 78712623Sphk{ 78844078Sdfr int i; 78944078Sdfr struct sysctl_oid *oidp; 79044078Sdfr struct sysctl_oid_list *lsp = &sysctl__children; 79112623Sphk char *p; 79212623Sphk 793216060Smdf SYSCTL_ASSERT_XLOCKED(); 794186564Sed 79512623Sphk if (!*name) 796139483Spjd return (ENOENT); 79712623Sphk 79812623Sphk p = name + strlen(name) - 1 ; 79912623Sphk if (*p == '.') 80012623Sphk *p = '\0'; 80112623Sphk 80212623Sphk *len = 0; 80312623Sphk 80412623Sphk for (p = name; *p && *p != '.'; p++) 80512623Sphk ; 80612623Sphk i = *p; 80712623Sphk if (i == '.') 80812623Sphk *p = '\0'; 80912623Sphk 81044078Sdfr oidp = SLIST_FIRST(lsp); 81112623Sphk 81244078Sdfr while (oidp && *len < CTL_MAXNAME) { 81344078Sdfr if (strcmp(name, oidp->oid_name)) { 81444078Sdfr oidp = SLIST_NEXT(oidp, oid_link); 81512623Sphk continue; 81612623Sphk } 81744078Sdfr *oid++ = oidp->oid_number; 81812623Sphk (*len)++; 81912623Sphk 82012623Sphk if (!i) { 82144078Sdfr if (oidpp) 82244078Sdfr *oidpp = oidp; 82312623Sphk return (0); 82412623Sphk } 82512623Sphk 82644078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 82712623Sphk break; 82812623Sphk 82944078Sdfr if (oidp->oid_handler) 83012623Sphk break; 83112623Sphk 832216058Smdf lsp = SYSCTL_CHILDREN(oidp); 83344078Sdfr oidp = SLIST_FIRST(lsp); 83412623Sphk name = p+1; 83512623Sphk for (p = name; *p && *p != '.'; p++) 83612623Sphk ; 83712623Sphk i = *p; 83812623Sphk if (i == '.') 83912623Sphk *p = '\0'; 84012623Sphk } 841139483Spjd return (ENOENT); 84212623Sphk} 84312623Sphk 84412623Sphkstatic int 84562573Sphksysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 84612623Sphk{ 84712623Sphk char *p; 84812623Sphk int error, oid[CTL_MAXNAME], len; 84912623Sphk struct sysctl_oid *op = 0; 85012623Sphk 85112623Sphk if (!req->newlen) 852139483Spjd return (ENOENT); 85345140Sphk if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 85445140Sphk return (ENAMETOOLONG); 85512623Sphk 856111119Simp p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 85712623Sphk 85812623Sphk error = SYSCTL_IN(req, p, req->newlen); 85912623Sphk if (error) { 86012623Sphk free(p, M_SYSCTL); 86112623Sphk return (error); 86212623Sphk } 86312623Sphk 86412623Sphk p [req->newlen] = '\0'; 86512623Sphk 866216060Smdf SYSCTL_XLOCK(); 86712623Sphk error = name2oid(p, oid, &len, &op); 868216060Smdf SYSCTL_XUNLOCK(); 86912623Sphk 87012623Sphk free(p, M_SYSCTL); 87112623Sphk 87212623Sphk if (error) 87312623Sphk return (error); 87412623Sphk 87512650Sphk error = SYSCTL_OUT(req, oid, len * sizeof *oid); 87612623Sphk return (error); 87712623Sphk} 87812623Sphk 879187864SedSYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY|CTLFLAG_MPSAFE, 880187864Sed 0, 0, sysctl_sysctl_name2oid, "I", ""); 88112623Sphk 88212623Sphkstatic int 88362573Sphksysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 88412623Sphk{ 88544078Sdfr struct sysctl_oid *oid; 88653977Sgreen int error; 88712623Sphk 888216060Smdf SYSCTL_XLOCK(); 88953977Sgreen error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 89053977Sgreen if (error) 891216060Smdf goto out; 89212623Sphk 893216060Smdf if (oid->oid_fmt == NULL) { 894216060Smdf error = ENOENT; 895216060Smdf goto out; 896216060Smdf } 89753977Sgreen error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 89853977Sgreen if (error) 899216060Smdf goto out; 90053977Sgreen error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 901216060Smdf out: 902216060Smdf SYSCTL_XUNLOCK(); 90312650Sphk return (error); 90412623Sphk} 90512623Sphk 90642467Sphk 907187864Sedstatic SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD|CTLFLAG_MPSAFE, 908187864Sed sysctl_sysctl_oidfmt, ""); 90912623Sphk 91088006Sluigistatic int 91188006Sluigisysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 91288006Sluigi{ 91388006Sluigi struct sysctl_oid *oid; 91488006Sluigi int error; 91588006Sluigi 916216060Smdf SYSCTL_XLOCK(); 91788006Sluigi error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 91888006Sluigi if (error) 919216060Smdf goto out; 92088006Sluigi 921216060Smdf if (oid->oid_descr == NULL) { 922216060Smdf error = ENOENT; 923216060Smdf goto out; 924216060Smdf } 925141433Sphk error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1); 926216060Smdf out: 927216060Smdf SYSCTL_XUNLOCK(); 92888006Sluigi return (error); 92988006Sluigi} 93088006Sluigi 931141626Sphkstatic SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, ""); 93288006Sluigi 93312243Sphk/* 93412623Sphk * Default "handler" functions. 93512623Sphk */ 93612623Sphk 93712623Sphk/* 93842095Sdfr * Handle an int, signed or unsigned. 93912243Sphk * Two cases: 94012243Sphk * a variable: point arg1 at it. 94112243Sphk * a constant: pass it in arg2. 94212243Sphk */ 94312243Sphk 94411865Sphkint 94562573Sphksysctl_handle_int(SYSCTL_HANDLER_ARGS) 94611863Sphk{ 947100833Struckman int tmpout, error = 0; 94811863Sphk 949100833Struckman /* 950100833Struckman * Attempt to get a coherent snapshot by making a copy of the data. 951100833Struckman */ 95212243Sphk if (arg1) 953100833Struckman tmpout = *(int *)arg1; 95420506Sbde else 955100833Struckman tmpout = arg2; 956100833Struckman error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 95711863Sphk 95812243Sphk if (error || !req->newptr) 95912243Sphk return (error); 96011863Sphk 96112243Sphk if (!arg1) 96212243Sphk error = EPERM; 96312243Sphk else 96412243Sphk error = SYSCTL_IN(req, arg1, sizeof(int)); 96512243Sphk return (error); 96611863Sphk} 96711863Sphk 96812243Sphk/* 969155758Sandre * Based on on sysctl_handle_int() convert milliseconds into ticks. 970195699Srwatson * Note: this is used by TCP. 971155758Sandre */ 972155758Sandre 973155758Sandreint 974155758Sandresysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS) 975155758Sandre{ 976155758Sandre int error, s, tt; 977155758Sandre 978191688Szec tt = *(int *)arg1; 979155758Sandre s = (int)((int64_t)tt * 1000 / hz); 980155758Sandre 981155758Sandre error = sysctl_handle_int(oidp, &s, 0, req); 982155758Sandre if (error || !req->newptr) 983155758Sandre return (error); 984155758Sandre 985155758Sandre tt = (int)((int64_t)s * hz / 1000); 986155758Sandre if (tt < 1) 987155758Sandre return (EINVAL); 988155758Sandre 989191688Szec *(int *)arg1 = tt; 990155758Sandre return (0); 991155758Sandre} 992155758Sandre 993155758Sandre 994155758Sandre/* 99545140Sphk * Handle a long, signed or unsigned. arg1 points to it. 99638517Sdfr */ 99738517Sdfr 99838517Sdfrint 99962573Sphksysctl_handle_long(SYSCTL_HANDLER_ARGS) 100038517Sdfr{ 100138517Sdfr int error = 0; 1002136404Speter long tmplong; 1003136404Speter#ifdef SCTL_MASK32 1004136404Speter int tmpint; 1005136404Speter#endif 100638517Sdfr 1007100833Struckman /* 1008100833Struckman * Attempt to get a coherent snapshot by making a copy of the data. 1009100833Struckman */ 101045140Sphk if (!arg1) 101145140Sphk return (EINVAL); 1012136404Speter tmplong = *(long *)arg1; 1013136404Speter#ifdef SCTL_MASK32 1014136404Speter if (req->flags & SCTL_MASK32) { 1015136404Speter tmpint = tmplong; 1016136404Speter error = SYSCTL_OUT(req, &tmpint, sizeof(int)); 1017136404Speter } else 1018136404Speter#endif 1019136404Speter error = SYSCTL_OUT(req, &tmplong, sizeof(long)); 102038517Sdfr 102138517Sdfr if (error || !req->newptr) 102238517Sdfr return (error); 102338517Sdfr 1024136404Speter#ifdef SCTL_MASK32 1025136404Speter if (req->flags & SCTL_MASK32) { 1026136404Speter error = SYSCTL_IN(req, &tmpint, sizeof(int)); 1027136404Speter *(long *)arg1 = (long)tmpint; 1028136404Speter } else 1029136404Speter#endif 1030136404Speter error = SYSCTL_IN(req, arg1, sizeof(long)); 103138517Sdfr return (error); 103238517Sdfr} 103338517Sdfr 103438517Sdfr/* 1035170288Sdwmalone * Handle a 64 bit int, signed or unsigned. arg1 points to it. 1036170288Sdwmalone */ 1037170288Sdwmalone 1038170288Sdwmaloneint 1039170288Sdwmalonesysctl_handle_quad(SYSCTL_HANDLER_ARGS) 1040170288Sdwmalone{ 1041170288Sdwmalone int error = 0; 1042170288Sdwmalone uint64_t tmpout; 1043170288Sdwmalone 1044170288Sdwmalone /* 1045170288Sdwmalone * Attempt to get a coherent snapshot by making a copy of the data. 1046170288Sdwmalone */ 1047170288Sdwmalone if (!arg1) 1048170288Sdwmalone return (EINVAL); 1049170288Sdwmalone tmpout = *(uint64_t *)arg1; 1050170288Sdwmalone error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t)); 1051170288Sdwmalone 1052170288Sdwmalone if (error || !req->newptr) 1053170288Sdwmalone return (error); 1054170288Sdwmalone 1055170288Sdwmalone error = SYSCTL_IN(req, arg1, sizeof(uint64_t)); 1056170288Sdwmalone return (error); 1057170288Sdwmalone} 1058170288Sdwmalone 1059170288Sdwmalone/* 106012243Sphk * Handle our generic '\0' terminated 'C' string. 106112243Sphk * Two cases: 106212243Sphk * a variable string: point arg1 at it, arg2 is max length. 106312243Sphk * a constant string: point arg1 at it, arg2 is zero. 106412243Sphk */ 106512243Sphk 106611865Sphkint 106762573Sphksysctl_handle_string(SYSCTL_HANDLER_ARGS) 106811863Sphk{ 106912243Sphk int error=0; 1070100833Struckman char *tmparg; 1071100833Struckman size_t outlen; 107211863Sphk 1073100833Struckman /* 1074100833Struckman * Attempt to get a coherent snapshot by copying to a 1075100833Struckman * temporary kernel buffer. 1076100833Struckman */ 1077100833Struckmanretry: 1078100833Struckman outlen = strlen((char *)arg1)+1; 1079111119Simp tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); 1080105354Srobert 1081105354Srobert if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { 1082100833Struckman free(tmparg, M_SYSCTLTMP); 1083100833Struckman goto retry; 1084100833Struckman } 1085105354Srobert 1086100833Struckman error = SYSCTL_OUT(req, tmparg, outlen); 1087100833Struckman free(tmparg, M_SYSCTLTMP); 108811863Sphk 108945140Sphk if (error || !req->newptr) 109012243Sphk return (error); 109111863Sphk 109245140Sphk if ((req->newlen - req->newidx) >= arg2) { 109345140Sphk error = EINVAL; 109412243Sphk } else { 109512243Sphk arg2 = (req->newlen - req->newidx); 109612243Sphk error = SYSCTL_IN(req, arg1, arg2); 109712243Sphk ((char *)arg1)[arg2] = '\0'; 109811863Sphk } 109912131Sphk 110012131Sphk return (error); 110111863Sphk} 110211863Sphk 110312243Sphk/* 110412243Sphk * Handle any kind of opaque data. 110512243Sphk * arg1 points to it, arg2 is the size. 110612243Sphk */ 110712243Sphk 110811865Sphkint 110962573Sphksysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 111011863Sphk{ 1111120803Sbms int error, tries; 1112120803Sbms u_int generation; 1113120813Sbms struct sysctl_req req2; 111412243Sphk 1115100833Struckman /* 1116120803Sbms * Attempt to get a coherent snapshot, by using the thread 1117120803Sbms * pre-emption counter updated from within mi_switch() to 1118120803Sbms * determine if we were pre-empted during a bcopy() or 1119120803Sbms * copyout(). Make 3 attempts at doing this before giving up. 1120120803Sbms * If we encounter an error, stop immediately. 1121100833Struckman */ 1122120803Sbms tries = 0; 1123120813Sbms req2 = *req; 1124120813Sbmsretry: 1125120813Sbms generation = curthread->td_generation; 1126120813Sbms error = SYSCTL_OUT(req, arg1, arg2); 1127120813Sbms if (error) 1128120813Sbms return (error); 1129120813Sbms tries++; 1130120813Sbms if (generation != curthread->td_generation && tries < 3) { 1131120813Sbms *req = req2; 1132120813Sbms goto retry; 1133120813Sbms } 113412243Sphk 113512243Sphk error = SYSCTL_IN(req, arg1, arg2); 113612243Sphk 113712243Sphk return (error); 113812243Sphk} 113912243Sphk 114012260Sphk/* 114112260Sphk * Transfer functions to/from kernel space. 114212260Sphk * XXX: rather untested at this point 114312260Sphk */ 114412260Sphkstatic int 114538517Sdfrsysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 114612243Sphk{ 114738517Sdfr size_t i = 0; 114812260Sphk 114912260Sphk if (req->oldptr) { 115038517Sdfr i = l; 115173971Stmm if (req->oldlen <= req->oldidx) 115273971Stmm i = 0; 115373971Stmm else 115473971Stmm if (i > req->oldlen - req->oldidx) 115573971Stmm i = req->oldlen - req->oldidx; 115612260Sphk if (i > 0) 115717971Sbde bcopy(p, (char *)req->oldptr + req->oldidx, i); 115812243Sphk } 1159192144Skib req->oldidx += l; 116016282Snate if (req->oldptr && i != l) 116111863Sphk return (ENOMEM); 116212260Sphk return (0); 116312243Sphk} 116412243Sphk 116512260Sphkstatic int 116638517Sdfrsysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 116712243Sphk{ 116812260Sphk if (!req->newptr) 1169139483Spjd return (0); 117012260Sphk if (req->newlen - req->newidx < l) 117111863Sphk return (EINVAL); 117217971Sbde bcopy((char *)req->newptr + req->newidx, p, l); 117312243Sphk req->newidx += l; 117412131Sphk return (0); 117511863Sphk} 117611863Sphk 117716282Snateint 117883366Sjuliankernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1179136404Speter size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags) 118016282Snate{ 118116282Snate int error = 0; 118216282Snate struct sysctl_req req; 118316282Snate 118416282Snate bzero(&req, sizeof req); 118516282Snate 118686183Srwatson req.td = td; 1187136404Speter req.flags = flags; 118816282Snate 118916282Snate if (oldlenp) { 119016282Snate req.oldlen = *oldlenp; 119116282Snate } 1192127052Struckman req.validlen = req.oldlen; 119316282Snate 119416282Snate if (old) { 119516282Snate req.oldptr= old; 119616282Snate } 119716282Snate 119877646Sdd if (new != NULL) { 119916282Snate req.newlen = newlen; 120016282Snate req.newptr = new; 120116282Snate } 120216282Snate 120316282Snate req.oldfunc = sysctl_old_kernel; 120416282Snate req.newfunc = sysctl_new_kernel; 1205120781Sbms req.lock = REQ_LOCKED; 120616282Snate 1207216060Smdf SYSCTL_XLOCK(); 120816282Snate error = sysctl_root(0, name, namelen, &req); 1209216060Smdf SYSCTL_XUNLOCK(); 1210120813Sbms 1211127052Struckman if (req.lock == REQ_WIRED && req.validlen > 0) 1212127052Struckman vsunlock(req.oldptr, req.validlen); 121316282Snate 121416282Snate if (error && error != ENOMEM) 121516282Snate return (error); 121616282Snate 121716282Snate if (retval) { 1218127052Struckman if (req.oldptr && req.oldidx > req.validlen) 1219127052Struckman *retval = req.validlen; 122016282Snate else 122116282Snate *retval = req.oldidx; 122216282Snate } 122316282Snate return (error); 122416282Snate} 122516282Snate 122676834Sjlemonint 122783366Sjuliankernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 1228136404Speter void *new, size_t newlen, size_t *retval, int flags) 122976834Sjlemon{ 123076834Sjlemon int oid[CTL_MAXNAME]; 123178620Smjacob size_t oidlen, plen; 123278620Smjacob int error; 123376834Sjlemon 123476834Sjlemon oid[0] = 0; /* sysctl internal magic */ 123576834Sjlemon oid[1] = 3; /* name2oid */ 123676834Sjlemon oidlen = sizeof(oid); 123776834Sjlemon 123883366Sjulian error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1239136404Speter (void *)name, strlen(name), &plen, flags); 124076834Sjlemon if (error) 124176834Sjlemon return (error); 124276834Sjlemon 124383366Sjulian error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1244136404Speter new, newlen, retval, flags); 124576834Sjlemon return (error); 124676834Sjlemon} 124776834Sjlemon 124812260Sphk/* 124912260Sphk * Transfer function to/from user space. 125012260Sphk */ 125112260Sphkstatic int 125238517Sdfrsysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 125312243Sphk{ 125438517Sdfr int error = 0; 1255126253Struckman size_t i, len, origidx; 125612243Sphk 1257126253Struckman origidx = req->oldidx; 1258192144Skib req->oldidx += l; 1259192144Skib if (req->oldptr == NULL) 1260126253Struckman return (0); 1261148864Scsjp /* 1262148864Scsjp * If we have not wired the user supplied buffer and we are currently 1263148864Scsjp * holding locks, drop a witness warning, as it's possible that 1264148864Scsjp * write operations to the user page can sleep. 1265148864Scsjp */ 1266148864Scsjp if (req->lock != REQ_WIRED) 1267111883Sjhb WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1268111883Sjhb "sysctl_old_user()"); 1269126253Struckman i = l; 1270127052Struckman len = req->validlen; 1271126253Struckman if (len <= origidx) 1272126253Struckman i = 0; 1273126253Struckman else { 1274126253Struckman if (i > len - origidx) 1275126253Struckman i = len - origidx; 1276126253Struckman error = copyout(p, (char *)req->oldptr + origidx, i); 127712260Sphk } 127812243Sphk if (error) 127912243Sphk return (error); 1280126253Struckman if (i < l) 128112243Sphk return (ENOMEM); 128212260Sphk return (0); 128312243Sphk} 128412243Sphk 128512260Sphkstatic int 128638517Sdfrsysctl_new_user(struct sysctl_req *req, void *p, size_t l) 128712243Sphk{ 128812285Sphk int error; 128912260Sphk 129012260Sphk if (!req->newptr) 1291139483Spjd return (0); 129212260Sphk if (req->newlen - req->newidx < l) 129312243Sphk return (EINVAL); 1294148873Scsjp WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1295148873Scsjp "sysctl_new_user()"); 129617971Sbde error = copyin((char *)req->newptr + req->newidx, p, l); 129712243Sphk req->newidx += l; 129812243Sphk return (error); 129912243Sphk} 130012243Sphk 1301100487Struckman/* 1302100487Struckman * Wire the user space destination buffer. If set to a value greater than 1303100487Struckman * zero, the len parameter limits the maximum amount of wired memory. 1304100487Struckman */ 1305126253Struckmanint 1306100487Struckmansysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1307100487Struckman{ 1308126253Struckman int ret; 1309192160Sdes size_t wiredlen; 1310126253Struckman 1311126253Struckman wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen; 1312126253Struckman ret = 0; 1313120781Sbms if (req->lock == REQ_LOCKED && req->oldptr && 1314120781Sbms req->oldfunc == sysctl_old_user) { 1315127050Struckman if (wiredlen != 0) { 1316127050Struckman ret = vslock(req->oldptr, wiredlen); 1317130327Sgreen if (ret != 0) { 1318130327Sgreen if (ret != ENOMEM) 1319130327Sgreen return (ret); 1320130327Sgreen wiredlen = 0; 1321130327Sgreen } 1322126253Struckman } 1323127050Struckman req->lock = REQ_WIRED; 1324127052Struckman req->validlen = wiredlen; 1325100487Struckman } 1326127050Struckman return (0); 1327100487Struckman} 1328100487Struckman 13291541Srgrimesint 133053977Sgreensysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 133153977Sgreen int *nindx, struct sysctl_req *req) 133212131Sphk{ 1333216059Smdf struct sysctl_oid_list *lsp; 133444078Sdfr struct sysctl_oid *oid; 133553977Sgreen int indx; 133612131Sphk 1337216060Smdf SYSCTL_ASSERT_XLOCKED(); 1338216059Smdf lsp = &sysctl__children; 133912131Sphk indx = 0; 1340216059Smdf while (indx < CTL_MAXNAME) { 1341216059Smdf SLIST_FOREACH(oid, lsp, oid_link) { 1342216059Smdf if (oid->oid_number == name[indx]) 1343216059Smdf break; 1344216059Smdf } 1345216059Smdf if (oid == NULL) 1346216059Smdf return (ENOENT); 1347216059Smdf 1348216059Smdf indx++; 1349216059Smdf if (oid->oid_kind & CTLFLAG_NOLOCK) 1350216059Smdf req->lock = REQ_UNLOCKED; 1351216059Smdf if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1352216059Smdf if (oid->oid_handler != NULL || indx == namelen) { 135353977Sgreen *noid = oid; 135453977Sgreen if (nindx != NULL) 135553977Sgreen *nindx = indx; 1356216060Smdf KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 1357216060Smdf ("%s found DYING node %p", __func__, oid)); 135853977Sgreen return (0); 135912131Sphk } 1360216059Smdf lsp = SYSCTL_CHILDREN(oid); 1361216059Smdf } else if (indx == namelen) { 1362216059Smdf *noid = oid; 1363216059Smdf if (nindx != NULL) 1364216059Smdf *nindx = indx; 1365216060Smdf KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 1366216060Smdf ("%s found DYING node %p", __func__, oid)); 1367216059Smdf return (0); 136812131Sphk } else { 1369216059Smdf return (ENOTDIR); 137012131Sphk } 137112131Sphk } 137253977Sgreen return (ENOENT); 137353977Sgreen} 137453977Sgreen 137553977Sgreen/* 137653977Sgreen * Traverse our tree, and find the right node, execute whatever it points 137753977Sgreen * to, and return the resulting error code. 137853977Sgreen */ 137953977Sgreen 1380104094Sphkstatic int 138162573Sphksysctl_root(SYSCTL_HANDLER_ARGS) 138253977Sgreen{ 138353977Sgreen struct sysctl_oid *oid; 1384109246Sdillon int error, indx, lvl; 138553977Sgreen 1386216060Smdf SYSCTL_ASSERT_XLOCKED(); 1387186564Sed 138853977Sgreen error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 138953977Sgreen if (error) 139053977Sgreen return (error); 139153977Sgreen 139253977Sgreen if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 139353977Sgreen /* 139453977Sgreen * You can't call a sysctl when it's a node, but has 139553977Sgreen * no handler. Inform the user that it's a node. 139653977Sgreen * The indx may or may not be the same as namelen. 139753977Sgreen */ 139853977Sgreen if (oid->oid_handler == NULL) 139953977Sgreen return (EISDIR); 140053977Sgreen } 140153977Sgreen 140283968Srwatson /* Is this sysctl writable? */ 140383968Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) 140412131Sphk return (EPERM); 140512131Sphk 140692953Srwatson KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 140792953Srwatson 140883968Srwatson /* Is this sysctl sensitive to securelevels? */ 140983968Srwatson if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 1410109246Sdillon lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 1411109246Sdillon error = securelevel_gt(req->td->td_ucred, lvl); 141292953Srwatson if (error) 141392953Srwatson return (error); 141483968Srwatson } 141512910Sphk 141683968Srwatson /* Is this sysctl writable by only privileged users? */ 141783968Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 1418196176Sbz int priv; 1419196176Sbz 142092953Srwatson if (oid->oid_kind & CTLFLAG_PRISON) 1421196176Sbz priv = PRIV_SYSCTL_WRITEJAIL; 1422196176Sbz#ifdef VIMAGE 1423196176Sbz else if ((oid->oid_kind & CTLFLAG_VNET) && 1424196176Sbz prison_owns_vnet(req->td->td_ucred)) 1425196176Sbz priv = PRIV_SYSCTL_WRITEJAIL; 1426196176Sbz#endif 142792953Srwatson else 1428196176Sbz priv = PRIV_SYSCTL_WRITE; 1429196176Sbz error = priv_check(req->td, priv); 143092953Srwatson if (error) 143192953Srwatson return (error); 143283968Srwatson } 143383968Srwatson 143444078Sdfr if (!oid->oid_handler) 1435139483Spjd return (EINVAL); 143612131Sphk 1437126121Spjd if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1438132776Skan arg1 = (int *)arg1 + indx; 1439126121Spjd arg2 -= indx; 1440126121Spjd } else { 1441126121Spjd arg1 = oid->oid_arg1; 1442126121Spjd arg2 = oid->oid_arg2; 1443126121Spjd } 1444126121Spjd#ifdef MAC 1445172930Srwatson error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2, 1446126121Spjd req); 1447126121Spjd if (error != 0) 1448126121Spjd return (error); 1449126121Spjd#endif 1450216060Smdf oid->oid_running++; 1451216060Smdf SYSCTL_XUNLOCK(); 1452216060Smdf 1453187656Sjhb if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1454187656Sjhb mtx_lock(&Giant); 1455126121Spjd error = oid->oid_handler(oid, arg1, arg2, req); 1456187656Sjhb if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1457187656Sjhb mtx_unlock(&Giant); 1458126121Spjd 1459216060Smdf KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error); 1460216060Smdf 1461216060Smdf SYSCTL_XLOCK(); 1462216060Smdf oid->oid_running--; 1463216060Smdf if (oid->oid_running == 0 && (oid->oid_kind & CTLFLAG_DYING) != 0) 1464216060Smdf wakeup(&oid->oid_running); 146553977Sgreen return (error); 146612131Sphk} 146712131Sphk 146812221Sbde#ifndef _SYS_SYSPROTO_H_ 146912171Sphkstruct sysctl_args { 147012171Sphk int *name; 147112171Sphk u_int namelen; 147212171Sphk void *old; 147312171Sphk size_t *oldlenp; 147412171Sphk void *new; 147512171Sphk size_t newlen; 147612171Sphk}; 147712221Sbde#endif 147812131Sphkint 147983366Sjulian__sysctl(struct thread *td, struct sysctl_args *uap) 14801541Srgrimes{ 1481188232Sjhb int error, i, name[CTL_MAXNAME]; 148238517Sdfr size_t j; 14831541Srgrimes 14841541Srgrimes if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 14851541Srgrimes return (EINVAL); 148611863Sphk 14873308Sphk error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 14883308Sphk if (error) 14891541Srgrimes return (error); 14901541Srgrimes 149183366Sjulian error = userland_sysctl(td, name, uap->namelen, 149212171Sphk uap->old, uap->oldlenp, 0, 1493136404Speter uap->new, uap->newlen, &j, 0); 149412260Sphk if (error && error != ENOMEM) 1495186564Sed return (error); 1496186664Sed if (uap->oldlenp) { 1497188232Sjhb i = copyout(&j, uap->oldlenp, sizeof(j)); 1498186664Sed if (i) 1499186664Sed return (i); 1500186664Sed } 150112260Sphk return (error); 150212171Sphk} 150312171Sphk 150412171Sphk/* 150512171Sphk * This is used from various compatibility syscalls too. That's why name 150612171Sphk * must be in kernel space. 150712171Sphk */ 150812171Sphkint 150983366Sjulianuserland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1510136404Speter size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval, 1511136404Speter int flags) 151212171Sphk{ 1513192125Sjhb int error = 0, memlocked; 1514127052Struckman struct sysctl_req req; 151512171Sphk 151612243Sphk bzero(&req, sizeof req); 151712243Sphk 151886183Srwatson req.td = td; 1519136404Speter req.flags = flags; 152012285Sphk 152112171Sphk if (oldlenp) { 152212171Sphk if (inkernel) { 152312243Sphk req.oldlen = *oldlenp; 152412171Sphk } else { 152512260Sphk error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 152612171Sphk if (error) 152712171Sphk return (error); 152812171Sphk } 152912171Sphk } 1530127052Struckman req.validlen = req.oldlen; 153112171Sphk 153212243Sphk if (old) { 153352644Sphk if (!useracc(old, req.oldlen, VM_PROT_WRITE)) 153412243Sphk return (EFAULT); 153512243Sphk req.oldptr= old; 153612243Sphk } 153712131Sphk 153877646Sdd if (new != NULL) { 1539172038Srwatson if (!useracc(new, newlen, VM_PROT_READ)) 154012243Sphk return (EFAULT); 154112243Sphk req.newlen = newlen; 154212243Sphk req.newptr = new; 154311863Sphk } 154412131Sphk 154512243Sphk req.oldfunc = sysctl_old_user; 154612243Sphk req.newfunc = sysctl_new_user; 1547120781Sbms req.lock = REQ_LOCKED; 154811863Sphk 1549189707Sjhb#ifdef KTRACE 1550189707Sjhb if (KTRPOINT(curthread, KTR_SYSCTL)) 1551189707Sjhb ktrsysctl(name, namelen); 1552189707Sjhb#endif 1553192125Sjhb 1554192125Sjhb if (req.oldlen > PAGE_SIZE) { 1555192125Sjhb memlocked = 1; 1556192125Sjhb sx_xlock(&sysctlmemlock); 1557192125Sjhb } else 1558192125Sjhb memlocked = 0; 1559194252Sjamie CURVNET_SET(TD_TO_VNET(td)); 156012429Sphk 1561185983Skib for (;;) { 1562127052Struckman req.oldidx = 0; 1563127052Struckman req.newidx = 0; 1564216060Smdf SYSCTL_XLOCK(); 1565127052Struckman error = sysctl_root(0, name, namelen, &req); 1566216060Smdf SYSCTL_XUNLOCK(); 1567185983Skib if (error != EAGAIN) 1568185983Skib break; 1569185983Skib uio_yield(); 1570185983Skib } 157112243Sphk 1572186564Sed CURVNET_RESTORE(); 1573186564Sed 1574127052Struckman if (req.lock == REQ_WIRED && req.validlen > 0) 1575127052Struckman vsunlock(req.oldptr, req.validlen); 1576192125Sjhb if (memlocked) 1577192125Sjhb sx_xunlock(&sysctlmemlock); 157812429Sphk 157912260Sphk if (error && error != ENOMEM) 158012260Sphk return (error); 158112260Sphk 158212260Sphk if (retval) { 1583127052Struckman if (req.oldptr && req.oldidx > req.validlen) 1584127052Struckman *retval = req.validlen; 158512260Sphk else 158612260Sphk *retval = req.oldidx; 158711863Sphk } 158812260Sphk return (error); 15891541Srgrimes} 1590212750Smdf 1591212750Smdf/* 1592212750Smdf * Drain into a sysctl struct. The user buffer must be wired. 1593212750Smdf */ 1594212750Smdfstatic int 1595212750Smdfsbuf_sysctl_drain(void *arg, const char *data, int len) 1596212750Smdf{ 1597212750Smdf struct sysctl_req *req = arg; 1598212750Smdf int error; 1599212750Smdf 1600212750Smdf error = SYSCTL_OUT(req, data, len); 1601212750Smdf KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 1602212750Smdf return (error == 0 ? len : -error); 1603212750Smdf} 1604212750Smdf 1605212750Smdfstruct sbuf * 1606212750Smdfsbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 1607212750Smdf struct sysctl_req *req) 1608212750Smdf{ 1609212750Smdf 1610212750Smdf /* Wire the user buffer, so we can write without blocking. */ 1611212750Smdf sysctl_wire_old_buffer(req, 0); 1612212750Smdf 1613212750Smdf s = sbuf_new(s, buf, length, SBUF_FIXEDLEN); 1614212750Smdf sbuf_set_drain(s, sbuf_sysctl_drain, req); 1615212750Smdf return (s); 1616212750Smdf} 1617