1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Karels at Berkeley Software Design, Inc. 9 * 10 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 11 * project, to make these variables more userfriendly. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_capsicum.h" 44 #include "opt_ddb.h" 45 #include "opt_ktrace.h" 46 #include "opt_sysctl.h" 47 48 #include <sys/param.h> 49 #include <sys/fail.h> 50 #include <sys/systm.h> 51 #include <sys/capsicum.h> 52 #include <sys/kernel.h> 53 #include <sys/limits.h> 54 #include <sys/sysctl.h> 55 #include <sys/malloc.h> 56 #include <sys/priv.h> 57 #include <sys/proc.h> 58 #include <sys/jail.h> 59 #include <sys/kdb.h> 60 #include <sys/lock.h> 61 #include <sys/mutex.h> 62 #include <sys/rmlock.h> 63 #include <sys/sbuf.h> 64 #include <sys/sx.h> 65 #include <sys/sysproto.h> 66 #include <sys/uio.h> 67 #ifdef KTRACE 68 #include <sys/ktrace.h> 69 #endif 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #include <ddb/db_lex.h> 74 #endif 75 76 #include <net/vnet.h> 77 78 #include <security/mac/mac_framework.h> 79 80 #include <vm/vm.h> 81 #include <vm/vm_extern.h> 82 83 static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); 84 static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); 85 static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); 86 87 /* 88 * The sysctllock protects the MIB tree. It also protects sysctl 89 * contexts used with dynamic sysctls. The sysctl_register_oid() and 90 * sysctl_unregister_oid() routines require the sysctllock to already 91 * be held, so the sysctl_wlock() and sysctl_wunlock() routines are 92 * provided for the few places in the kernel which need to use that 93 * API rather than using the dynamic API. Use of the dynamic API is 94 * strongly encouraged for most code. 95 * 96 * The sysctlmemlock is used to limit the amount of user memory wired for 97 * sysctl requests. This is implemented by serializing any userland 98 * sysctl requests larger than a single page via an exclusive lock. 99 */ 100 static struct rmlock sysctllock; 101 static struct sx __exclusive_cache_line sysctlmemlock; 102 103 #define SYSCTL_WLOCK() rm_wlock(&sysctllock) 104 #define SYSCTL_WUNLOCK() rm_wunlock(&sysctllock) 105 #define SYSCTL_RLOCK(tracker) rm_rlock(&sysctllock, (tracker)) 106 #define SYSCTL_RUNLOCK(tracker) rm_runlock(&sysctllock, (tracker)) 107 #define SYSCTL_WLOCKED() rm_wowned(&sysctllock) 108 #define SYSCTL_ASSERT_LOCKED() rm_assert(&sysctllock, RA_LOCKED) 109 #define SYSCTL_ASSERT_WLOCKED() rm_assert(&sysctllock, RA_WLOCKED) 110 #define SYSCTL_ASSERT_RLOCKED() rm_assert(&sysctllock, RA_RLOCKED) 111 #define SYSCTL_INIT() rm_init_flags(&sysctllock, "sysctl lock", \ 112 RM_SLEEPABLE) 113 #define SYSCTL_SLEEP(ch, wmesg, timo) \ 114 rm_sleep(ch, &sysctllock, 0, wmesg, timo) 115 116 static int sysctl_root(SYSCTL_HANDLER_ARGS); 117 118 /* Root list */ 119 struct sysctl_oid_list sysctl__children = SLIST_HEAD_INITIALIZER(&sysctl__children); 120 121 static int sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, 122 int recurse); 123 static int sysctl_old_kernel(struct sysctl_req *, const void *, size_t); 124 static int sysctl_new_kernel(struct sysctl_req *, void *, size_t); 125 126 static struct sysctl_oid * 127 sysctl_find_oidname(const char *name, struct sysctl_oid_list *list) 128 { 129 struct sysctl_oid *oidp; 130 131 SYSCTL_ASSERT_LOCKED(); 132 SLIST_FOREACH(oidp, list, oid_link) { 133 if (strcmp(oidp->oid_name, name) == 0) { 134 return (oidp); 135 } 136 } 137 return (NULL); 138 } 139 140 /* 141 * Initialization of the MIB tree. 142 * 143 * Order by number in each list. 144 */ 145 void 146 sysctl_wlock(void) 147 { 148 149 SYSCTL_WLOCK(); 150 } 151 152 void 153 sysctl_wunlock(void) 154 { 155 156 SYSCTL_WUNLOCK(); 157 } 158 159 static int 160 sysctl_root_handler_locked(struct sysctl_oid *oid, void *arg1, intmax_t arg2, 161 struct sysctl_req *req, struct rm_priotracker *tracker) 162 { 163 int error; 164 165 if (oid->oid_kind & CTLFLAG_DYN) 166 atomic_add_int(&oid->oid_running, 1); 167 168 if (tracker != NULL) 169 SYSCTL_RUNLOCK(tracker); 170 else 171 SYSCTL_WUNLOCK(); 172 173 if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 174 mtx_lock(&Giant); 175 error = oid->oid_handler(oid, arg1, arg2, req); 176 if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 177 mtx_unlock(&Giant); 178 179 KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error); 180 181 if (tracker != NULL) 182 SYSCTL_RLOCK(tracker); 183 else 184 SYSCTL_WLOCK(); 185 186 if (oid->oid_kind & CTLFLAG_DYN) { 187 if (atomic_fetchadd_int(&oid->oid_running, -1) == 1 && 188 (oid->oid_kind & CTLFLAG_DYING) != 0) 189 wakeup(&oid->oid_running); 190 } 191 192 return (error); 193 } 194 195 static void 196 sysctl_load_tunable_by_oid_locked(struct sysctl_oid *oidp) 197 { 198 struct sysctl_req req; 199 struct sysctl_oid *curr; 200 char *penv = NULL; 201 char path[96]; 202 ssize_t rem = sizeof(path); 203 ssize_t len; 204 uint8_t data[512] __aligned(sizeof(uint64_t)); 205 int size; 206 int error; 207 208 path[--rem] = 0; 209 210 for (curr = oidp; curr != NULL; curr = SYSCTL_PARENT(curr)) { 211 len = strlen(curr->oid_name); 212 rem -= len; 213 if (curr != oidp) 214 rem -= 1; 215 if (rem < 0) { 216 printf("OID path exceeds %d bytes\n", (int)sizeof(path)); 217 return; 218 } 219 memcpy(path + rem, curr->oid_name, len); 220 if (curr != oidp) 221 path[rem + len] = '.'; 222 } 223 224 memset(&req, 0, sizeof(req)); 225 226 req.td = curthread; 227 req.oldfunc = sysctl_old_kernel; 228 req.newfunc = sysctl_new_kernel; 229 req.lock = REQ_UNWIRED; 230 231 switch (oidp->oid_kind & CTLTYPE) { 232 case CTLTYPE_INT: 233 if (getenv_array(path + rem, data, sizeof(data), &size, 234 sizeof(int), GETENV_SIGNED) == 0) 235 return; 236 req.newlen = size; 237 req.newptr = data; 238 break; 239 case CTLTYPE_UINT: 240 if (getenv_array(path + rem, data, sizeof(data), &size, 241 sizeof(int), GETENV_UNSIGNED) == 0) 242 return; 243 req.newlen = size; 244 req.newptr = data; 245 break; 246 case CTLTYPE_LONG: 247 if (getenv_array(path + rem, data, sizeof(data), &size, 248 sizeof(long), GETENV_SIGNED) == 0) 249 return; 250 req.newlen = size; 251 req.newptr = data; 252 break; 253 case CTLTYPE_ULONG: 254 if (getenv_array(path + rem, data, sizeof(data), &size, 255 sizeof(long), GETENV_UNSIGNED) == 0) 256 return; 257 req.newlen = size; 258 req.newptr = data; 259 break; 260 case CTLTYPE_S8: 261 if (getenv_array(path + rem, data, sizeof(data), &size, 262 sizeof(int8_t), GETENV_SIGNED) == 0) 263 return; 264 req.newlen = size; 265 req.newptr = data; 266 break; 267 case CTLTYPE_S16: 268 if (getenv_array(path + rem, data, sizeof(data), &size, 269 sizeof(int16_t), GETENV_SIGNED) == 0) 270 return; 271 req.newlen = size; 272 req.newptr = data; 273 break; 274 case CTLTYPE_S32: 275 if (getenv_array(path + rem, data, sizeof(data), &size, 276 sizeof(int32_t), GETENV_SIGNED) == 0) 277 return; 278 req.newlen = size; 279 req.newptr = data; 280 break; 281 case CTLTYPE_S64: 282 if (getenv_array(path + rem, data, sizeof(data), &size, 283 sizeof(int64_t), GETENV_SIGNED) == 0) 284 return; 285 req.newlen = size; 286 req.newptr = data; 287 break; 288 case CTLTYPE_U8: 289 if (getenv_array(path + rem, data, sizeof(data), &size, 290 sizeof(uint8_t), GETENV_UNSIGNED) == 0) 291 return; 292 req.newlen = size; 293 req.newptr = data; 294 break; 295 case CTLTYPE_U16: 296 if (getenv_array(path + rem, data, sizeof(data), &size, 297 sizeof(uint16_t), GETENV_UNSIGNED) == 0) 298 return; 299 req.newlen = size; 300 req.newptr = data; 301 break; 302 case CTLTYPE_U32: 303 if (getenv_array(path + rem, data, sizeof(data), &size, 304 sizeof(uint32_t), GETENV_UNSIGNED) == 0) 305 return; 306 req.newlen = size; 307 req.newptr = data; 308 break; 309 case CTLTYPE_U64: 310 if (getenv_array(path + rem, data, sizeof(data), &size, 311 sizeof(uint64_t), GETENV_UNSIGNED) == 0) 312 return; 313 req.newlen = size; 314 req.newptr = data; 315 break; 316 case CTLTYPE_STRING: 317 penv = kern_getenv(path + rem); 318 if (penv == NULL) 319 return; 320 req.newlen = strlen(penv); 321 req.newptr = penv; 322 break; 323 default: 324 return; 325 } 326 error = sysctl_root_handler_locked(oidp, oidp->oid_arg1, 327 oidp->oid_arg2, &req, NULL); 328 if (error != 0) 329 printf("Setting sysctl %s failed: %d\n", path + rem, error); 330 if (penv != NULL) 331 freeenv(penv); 332 } 333 334 /* 335 * Locate the path to a given oid. Returns the length of the resulting path, 336 * or -1 if the oid was not found. nodes must have room for CTL_MAXNAME 337 * elements and be NULL initialized. 338 */ 339 static int 340 sysctl_search_oid(struct sysctl_oid **nodes, struct sysctl_oid *needle) 341 { 342 int indx; 343 344 SYSCTL_ASSERT_LOCKED(); 345 indx = 0; 346 while (indx < CTL_MAXNAME && indx >= 0) { 347 if (nodes[indx] == NULL && indx == 0) 348 nodes[indx] = SLIST_FIRST(&sysctl__children); 349 else if (nodes[indx] == NULL) 350 nodes[indx] = SLIST_FIRST(&nodes[indx - 1]->oid_children); 351 else 352 nodes[indx] = SLIST_NEXT(nodes[indx], oid_link); 353 354 if (nodes[indx] == needle) 355 return (indx + 1); 356 357 if (nodes[indx] == NULL) { 358 indx--; 359 continue; 360 } 361 362 if ((nodes[indx]->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 363 indx++; 364 continue; 365 } 366 } 367 return (-1); 368 } 369 370 static void 371 sysctl_warn_reuse(const char *func, struct sysctl_oid *leaf) 372 { 373 struct sysctl_oid *nodes[CTL_MAXNAME]; 374 char buf[128]; 375 struct sbuf sb; 376 int rc, i; 377 378 (void)sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN | SBUF_INCLUDENUL); 379 sbuf_set_drain(&sb, sbuf_printf_drain, NULL); 380 381 sbuf_printf(&sb, "%s: can't re-use a leaf (", __func__); 382 383 memset(nodes, 0, sizeof(nodes)); 384 rc = sysctl_search_oid(nodes, leaf); 385 if (rc > 0) { 386 for (i = 0; i < rc; i++) 387 sbuf_printf(&sb, "%s%.*s", nodes[i]->oid_name, 388 i != (rc - 1), "."); 389 } else { 390 sbuf_printf(&sb, "%s", leaf->oid_name); 391 } 392 sbuf_printf(&sb, ")!\n"); 393 394 (void)sbuf_finish(&sb); 395 } 396 397 #ifdef SYSCTL_DEBUG 398 static int 399 sysctl_reuse_test(SYSCTL_HANDLER_ARGS) 400 { 401 struct rm_priotracker tracker; 402 403 SYSCTL_RLOCK(&tracker); 404 sysctl_warn_reuse(__func__, oidp); 405 SYSCTL_RUNLOCK(&tracker); 406 return (0); 407 } 408 SYSCTL_PROC(_sysctl, OID_AUTO, reuse_test, 409 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, sysctl_reuse_test, "-", 410 ""); 411 #endif 412 413 void 414 sysctl_register_oid(struct sysctl_oid *oidp) 415 { 416 struct sysctl_oid_list *parent = oidp->oid_parent; 417 struct sysctl_oid *p; 418 struct sysctl_oid *q; 419 int oid_number; 420 int timeout = 2; 421 422 /* 423 * First check if another oid with the same name already 424 * exists in the parent's list. 425 */ 426 SYSCTL_ASSERT_WLOCKED(); 427 p = sysctl_find_oidname(oidp->oid_name, parent); 428 if (p != NULL) { 429 if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 430 p->oid_refcnt++; 431 return; 432 } else { 433 sysctl_warn_reuse(__func__, p); 434 return; 435 } 436 } 437 /* get current OID number */ 438 oid_number = oidp->oid_number; 439 440 #if (OID_AUTO >= 0) 441 #error "OID_AUTO is expected to be a negative value" 442 #endif 443 /* 444 * Any negative OID number qualifies as OID_AUTO. Valid OID 445 * numbers should always be positive. 446 * 447 * NOTE: DO NOT change the starting value here, change it in 448 * <sys/sysctl.h>, and make sure it is at least 256 to 449 * accommodate e.g. net.inet.raw as a static sysctl node. 450 */ 451 if (oid_number < 0) { 452 static int newoid; 453 454 /* 455 * By decrementing the next OID number we spend less 456 * time inserting the OIDs into a sorted list. 457 */ 458 if (--newoid < CTL_AUTO_START) 459 newoid = 0x7fffffff; 460 461 oid_number = newoid; 462 } 463 464 /* 465 * Insert the OID into the parent's list sorted by OID number. 466 */ 467 retry: 468 q = NULL; 469 SLIST_FOREACH(p, parent, oid_link) { 470 /* check if the current OID number is in use */ 471 if (oid_number == p->oid_number) { 472 /* get the next valid OID number */ 473 if (oid_number < CTL_AUTO_START || 474 oid_number == 0x7fffffff) { 475 /* wraparound - restart */ 476 oid_number = CTL_AUTO_START; 477 /* don't loop forever */ 478 if (!timeout--) 479 panic("sysctl: Out of OID numbers\n"); 480 goto retry; 481 } else { 482 oid_number++; 483 } 484 } else if (oid_number < p->oid_number) 485 break; 486 q = p; 487 } 488 /* check for non-auto OID number collision */ 489 if (oidp->oid_number >= 0 && oidp->oid_number < CTL_AUTO_START && 490 oid_number >= CTL_AUTO_START) { 491 printf("sysctl: OID number(%d) is already in use for '%s'\n", 492 oidp->oid_number, oidp->oid_name); 493 } 494 /* update the OID number, if any */ 495 oidp->oid_number = oid_number; 496 if (q != NULL) 497 SLIST_INSERT_AFTER(q, oidp, oid_link); 498 else 499 SLIST_INSERT_HEAD(parent, oidp, oid_link); 500 501 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE && 502 #ifdef VIMAGE 503 (oidp->oid_kind & CTLFLAG_VNET) == 0 && 504 #endif 505 (oidp->oid_kind & CTLFLAG_TUN) != 0 && 506 (oidp->oid_kind & CTLFLAG_NOFETCH) == 0) { 507 /* only fetch value once */ 508 oidp->oid_kind |= CTLFLAG_NOFETCH; 509 /* try to fetch value from kernel environment */ 510 sysctl_load_tunable_by_oid_locked(oidp); 511 } 512 } 513 514 void 515 sysctl_register_disabled_oid(struct sysctl_oid *oidp) 516 { 517 518 /* 519 * Mark the leaf as dormant if it's not to be immediately enabled. 520 * We do not disable nodes as they can be shared between modules 521 * and it is always safe to access a node. 522 */ 523 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) == 0, 524 ("internal flag is set in oid_kind")); 525 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 526 oidp->oid_kind |= CTLFLAG_DORMANT; 527 sysctl_register_oid(oidp); 528 } 529 530 void 531 sysctl_enable_oid(struct sysctl_oid *oidp) 532 { 533 534 SYSCTL_ASSERT_WLOCKED(); 535 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 536 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) == 0, 537 ("sysctl node is marked as dormant")); 538 return; 539 } 540 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) != 0, 541 ("enabling already enabled sysctl oid")); 542 oidp->oid_kind &= ~CTLFLAG_DORMANT; 543 } 544 545 void 546 sysctl_unregister_oid(struct sysctl_oid *oidp) 547 { 548 struct sysctl_oid *p; 549 int error; 550 551 SYSCTL_ASSERT_WLOCKED(); 552 if (oidp->oid_number == OID_AUTO) { 553 error = EINVAL; 554 } else { 555 error = ENOENT; 556 SLIST_FOREACH(p, oidp->oid_parent, oid_link) { 557 if (p == oidp) { 558 SLIST_REMOVE(oidp->oid_parent, oidp, 559 sysctl_oid, oid_link); 560 error = 0; 561 break; 562 } 563 } 564 } 565 566 /* 567 * This can happen when a module fails to register and is 568 * being unloaded afterwards. It should not be a panic() 569 * for normal use. 570 */ 571 if (error) { 572 printf("%s: failed(%d) to unregister sysctl(%s)\n", 573 __func__, error, oidp->oid_name); 574 } 575 } 576 577 /* Initialize a new context to keep track of dynamically added sysctls. */ 578 int 579 sysctl_ctx_init(struct sysctl_ctx_list *c) 580 { 581 582 if (c == NULL) { 583 return (EINVAL); 584 } 585 586 /* 587 * No locking here, the caller is responsible for not adding 588 * new nodes to a context until after this function has 589 * returned. 590 */ 591 TAILQ_INIT(c); 592 return (0); 593 } 594 595 /* Free the context, and destroy all dynamic oids registered in this context */ 596 int 597 sysctl_ctx_free(struct sysctl_ctx_list *clist) 598 { 599 struct sysctl_ctx_entry *e, *e1; 600 int error; 601 602 error = 0; 603 /* 604 * First perform a "dry run" to check if it's ok to remove oids. 605 * XXX FIXME 606 * XXX This algorithm is a hack. But I don't know any 607 * XXX better solution for now... 608 */ 609 SYSCTL_WLOCK(); 610 TAILQ_FOREACH(e, clist, link) { 611 error = sysctl_remove_oid_locked(e->entry, 0, 0); 612 if (error) 613 break; 614 } 615 /* 616 * Restore deregistered entries, either from the end, 617 * or from the place where error occurred. 618 * e contains the entry that was not unregistered 619 */ 620 if (error) 621 e1 = TAILQ_PREV(e, sysctl_ctx_list, link); 622 else 623 e1 = TAILQ_LAST(clist, sysctl_ctx_list); 624 while (e1 != NULL) { 625 sysctl_register_oid(e1->entry); 626 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); 627 } 628 if (error) { 629 SYSCTL_WUNLOCK(); 630 return(EBUSY); 631 } 632 /* Now really delete the entries */ 633 e = TAILQ_FIRST(clist); 634 while (e != NULL) { 635 e1 = TAILQ_NEXT(e, link); 636 error = sysctl_remove_oid_locked(e->entry, 1, 0); 637 if (error) 638 panic("sysctl_remove_oid: corrupt tree, entry: %s", 639 e->entry->oid_name); 640 free(e, M_SYSCTLOID); 641 e = e1; 642 } 643 SYSCTL_WUNLOCK(); 644 return (error); 645 } 646 647 /* Add an entry to the context */ 648 struct sysctl_ctx_entry * 649 sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 650 { 651 struct sysctl_ctx_entry *e; 652 653 SYSCTL_ASSERT_WLOCKED(); 654 if (clist == NULL || oidp == NULL) 655 return(NULL); 656 e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); 657 e->entry = oidp; 658 TAILQ_INSERT_HEAD(clist, e, link); 659 return (e); 660 } 661 662 /* Find an entry in the context */ 663 struct sysctl_ctx_entry * 664 sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 665 { 666 struct sysctl_ctx_entry *e; 667 668 SYSCTL_ASSERT_WLOCKED(); 669 if (clist == NULL || oidp == NULL) 670 return(NULL); 671 TAILQ_FOREACH(e, clist, link) { 672 if(e->entry == oidp) 673 return(e); 674 } 675 return (e); 676 } 677 678 /* 679 * Delete an entry from the context. 680 * NOTE: this function doesn't free oidp! You have to remove it 681 * with sysctl_remove_oid(). 682 */ 683 int 684 sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 685 { 686 struct sysctl_ctx_entry *e; 687 688 if (clist == NULL || oidp == NULL) 689 return (EINVAL); 690 SYSCTL_WLOCK(); 691 e = sysctl_ctx_entry_find(clist, oidp); 692 if (e != NULL) { 693 TAILQ_REMOVE(clist, e, link); 694 SYSCTL_WUNLOCK(); 695 free(e, M_SYSCTLOID); 696 return (0); 697 } else { 698 SYSCTL_WUNLOCK(); 699 return (ENOENT); 700 } 701 } 702 703 /* 704 * Remove dynamically created sysctl trees. 705 * oidp - top of the tree to be removed 706 * del - if 0 - just deregister, otherwise free up entries as well 707 * recurse - if != 0 traverse the subtree to be deleted 708 */ 709 int 710 sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) 711 { 712 int error; 713 714 SYSCTL_WLOCK(); 715 error = sysctl_remove_oid_locked(oidp, del, recurse); 716 SYSCTL_WUNLOCK(); 717 return (error); 718 } 719 720 int 721 sysctl_remove_name(struct sysctl_oid *parent, const char *name, 722 int del, int recurse) 723 { 724 struct sysctl_oid *p, *tmp; 725 int error; 726 727 error = ENOENT; 728 SYSCTL_WLOCK(); 729 SLIST_FOREACH_SAFE(p, SYSCTL_CHILDREN(parent), oid_link, tmp) { 730 if (strcmp(p->oid_name, name) == 0) { 731 error = sysctl_remove_oid_locked(p, del, recurse); 732 break; 733 } 734 } 735 SYSCTL_WUNLOCK(); 736 737 return (error); 738 } 739 740 741 static int 742 sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse) 743 { 744 struct sysctl_oid *p, *tmp; 745 int error; 746 747 SYSCTL_ASSERT_WLOCKED(); 748 if (oidp == NULL) 749 return(EINVAL); 750 if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 751 printf("Warning: can't remove non-dynamic nodes (%s)!\n", 752 oidp->oid_name); 753 return (EINVAL); 754 } 755 /* 756 * WARNING: normal method to do this should be through 757 * sysctl_ctx_free(). Use recursing as the last resort 758 * method to purge your sysctl tree of leftovers... 759 * However, if some other code still references these nodes, 760 * it will panic. 761 */ 762 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 763 if (oidp->oid_refcnt == 1) { 764 SLIST_FOREACH_SAFE(p, 765 SYSCTL_CHILDREN(oidp), oid_link, tmp) { 766 if (!recurse) { 767 printf("Warning: failed attempt to " 768 "remove oid %s with child %s\n", 769 oidp->oid_name, p->oid_name); 770 return (ENOTEMPTY); 771 } 772 error = sysctl_remove_oid_locked(p, del, 773 recurse); 774 if (error) 775 return (error); 776 } 777 } 778 } 779 if (oidp->oid_refcnt > 1 ) { 780 oidp->oid_refcnt--; 781 } else { 782 if (oidp->oid_refcnt == 0) { 783 printf("Warning: bad oid_refcnt=%u (%s)!\n", 784 oidp->oid_refcnt, oidp->oid_name); 785 return (EINVAL); 786 } 787 sysctl_unregister_oid(oidp); 788 if (del) { 789 /* 790 * Wait for all threads running the handler to drain. 791 * This preserves the previous behavior when the 792 * sysctl lock was held across a handler invocation, 793 * and is necessary for module unload correctness. 794 */ 795 while (oidp->oid_running > 0) { 796 oidp->oid_kind |= CTLFLAG_DYING; 797 SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0); 798 } 799 if (oidp->oid_descr) 800 free(__DECONST(char *, oidp->oid_descr), 801 M_SYSCTLOID); 802 if (oidp->oid_label) 803 free(__DECONST(char *, oidp->oid_label), 804 M_SYSCTLOID); 805 free(__DECONST(char *, oidp->oid_name), M_SYSCTLOID); 806 free(oidp, M_SYSCTLOID); 807 } 808 } 809 return (0); 810 } 811 /* 812 * Create new sysctls at run time. 813 * clist may point to a valid context initialized with sysctl_ctx_init(). 814 */ 815 struct sysctl_oid * 816 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 817 int number, const char *name, int kind, void *arg1, intmax_t arg2, 818 int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr, 819 const char *label) 820 { 821 struct sysctl_oid *oidp; 822 823 /* You have to hook up somewhere.. */ 824 if (parent == NULL) 825 return(NULL); 826 /* Check if the node already exists, otherwise create it */ 827 SYSCTL_WLOCK(); 828 oidp = sysctl_find_oidname(name, parent); 829 if (oidp != NULL) { 830 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 831 oidp->oid_refcnt++; 832 /* Update the context */ 833 if (clist != NULL) 834 sysctl_ctx_entry_add(clist, oidp); 835 SYSCTL_WUNLOCK(); 836 return (oidp); 837 } else { 838 sysctl_warn_reuse(__func__, oidp); 839 SYSCTL_WUNLOCK(); 840 return (NULL); 841 } 842 } 843 oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 844 oidp->oid_parent = parent; 845 SLIST_INIT(&oidp->oid_children); 846 oidp->oid_number = number; 847 oidp->oid_refcnt = 1; 848 oidp->oid_name = strdup(name, M_SYSCTLOID); 849 oidp->oid_handler = handler; 850 oidp->oid_kind = CTLFLAG_DYN | kind; 851 oidp->oid_arg1 = arg1; 852 oidp->oid_arg2 = arg2; 853 oidp->oid_fmt = fmt; 854 if (descr != NULL) 855 oidp->oid_descr = strdup(descr, M_SYSCTLOID); 856 if (label != NULL) 857 oidp->oid_label = strdup(label, M_SYSCTLOID); 858 /* Update the context, if used */ 859 if (clist != NULL) 860 sysctl_ctx_entry_add(clist, oidp); 861 /* Register this oid */ 862 sysctl_register_oid(oidp); 863 SYSCTL_WUNLOCK(); 864 return (oidp); 865 } 866 867 /* 868 * Rename an existing oid. 869 */ 870 void 871 sysctl_rename_oid(struct sysctl_oid *oidp, const char *name) 872 { 873 char *newname; 874 char *oldname; 875 876 newname = strdup(name, M_SYSCTLOID); 877 SYSCTL_WLOCK(); 878 oldname = __DECONST(char *, oidp->oid_name); 879 oidp->oid_name = newname; 880 SYSCTL_WUNLOCK(); 881 free(oldname, M_SYSCTLOID); 882 } 883 884 /* 885 * Reparent an existing oid. 886 */ 887 int 888 sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent) 889 { 890 struct sysctl_oid *oidp; 891 892 SYSCTL_WLOCK(); 893 if (oid->oid_parent == parent) { 894 SYSCTL_WUNLOCK(); 895 return (0); 896 } 897 oidp = sysctl_find_oidname(oid->oid_name, parent); 898 if (oidp != NULL) { 899 SYSCTL_WUNLOCK(); 900 return (EEXIST); 901 } 902 sysctl_unregister_oid(oid); 903 oid->oid_parent = parent; 904 oid->oid_number = OID_AUTO; 905 sysctl_register_oid(oid); 906 SYSCTL_WUNLOCK(); 907 return (0); 908 } 909 910 /* 911 * Register the kernel's oids on startup. 912 */ 913 SET_DECLARE(sysctl_set, struct sysctl_oid); 914 915 static void 916 sysctl_register_all(void *arg) 917 { 918 struct sysctl_oid **oidp; 919 920 sx_init(&sysctlmemlock, "sysctl mem"); 921 SYSCTL_INIT(); 922 SYSCTL_WLOCK(); 923 SET_FOREACH(oidp, sysctl_set) 924 sysctl_register_oid(*oidp); 925 SYSCTL_WUNLOCK(); 926 } 927 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_FIRST, sysctl_register_all, NULL); 928 929 /* 930 * "Staff-functions" 931 * 932 * These functions implement a presently undocumented interface 933 * used by the sysctl program to walk the tree, and get the type 934 * so it can print the value. 935 * This interface is under work and consideration, and should probably 936 * be killed with a big axe by the first person who can find the time. 937 * (be aware though, that the proper interface isn't as obvious as it 938 * may seem, there are various conflicting requirements. 939 * 940 * {CTL_SYSCTL, CTL_SYSCTL_DEBUG} printf the entire MIB-tree. 941 * {CTL_SYSCTL, CTL_SYSCTL_NAME, ...} return the name of the "..." 942 * OID. 943 * {CTL_SYSCTL, CTL_SYSCTL_NEXT, ...} return the next OID. 944 * {CTL_SYSCTL, CTL_SYSCTL_NAME2OID} return the OID of the name in 945 * "new" 946 * {CTL_SYSCTL, CTL_SYSCTL_OIDFMT, ...} return the kind & format info 947 * for the "..." OID. 948 * {CTL_SYSCTL, CTL_SYSCTL_OIDDESCR, ...} return the description of the 949 * "..." OID. 950 * {CTL_SYSCTL, CTL_SYSCTL_OIDLABEL, ...} return the aggregation label of 951 * the "..." OID. 952 */ 953 954 #ifdef SYSCTL_DEBUG 955 static void 956 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 957 { 958 int k; 959 struct sysctl_oid *oidp; 960 961 SYSCTL_ASSERT_LOCKED(); 962 SLIST_FOREACH(oidp, l, oid_link) { 963 964 for (k=0; k<i; k++) 965 printf(" "); 966 967 printf("%d %s ", oidp->oid_number, oidp->oid_name); 968 969 printf("%c%c", 970 oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 971 oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 972 973 if (oidp->oid_handler) 974 printf(" *Handler"); 975 976 switch (oidp->oid_kind & CTLTYPE) { 977 case CTLTYPE_NODE: 978 printf(" Node\n"); 979 if (!oidp->oid_handler) { 980 sysctl_sysctl_debug_dump_node( 981 SYSCTL_CHILDREN(oidp), i + 2); 982 } 983 break; 984 case CTLTYPE_INT: printf(" Int\n"); break; 985 case CTLTYPE_UINT: printf(" u_int\n"); break; 986 case CTLTYPE_LONG: printf(" Long\n"); break; 987 case CTLTYPE_ULONG: printf(" u_long\n"); break; 988 case CTLTYPE_STRING: printf(" String\n"); break; 989 case CTLTYPE_S8: printf(" int8_t\n"); break; 990 case CTLTYPE_S16: printf(" int16_t\n"); break; 991 case CTLTYPE_S32: printf(" int32_t\n"); break; 992 case CTLTYPE_S64: printf(" int64_t\n"); break; 993 case CTLTYPE_U8: printf(" uint8_t\n"); break; 994 case CTLTYPE_U16: printf(" uint16_t\n"); break; 995 case CTLTYPE_U32: printf(" uint32_t\n"); break; 996 case CTLTYPE_U64: printf(" uint64_t\n"); break; 997 case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 998 default: printf("\n"); 999 } 1000 1001 } 1002 } 1003 1004 static int 1005 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 1006 { 1007 struct rm_priotracker tracker; 1008 int error; 1009 1010 error = priv_check(req->td, PRIV_SYSCTL_DEBUG); 1011 if (error) 1012 return (error); 1013 SYSCTL_RLOCK(&tracker); 1014 sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 1015 SYSCTL_RUNLOCK(&tracker); 1016 return (ENOENT); 1017 } 1018 1019 SYSCTL_PROC(_sysctl, CTL_SYSCTL_DEBUG, debug, CTLTYPE_STRING | CTLFLAG_RD | 1020 CTLFLAG_MPSAFE, 0, 0, sysctl_sysctl_debug, "-", ""); 1021 #endif 1022 1023 static int 1024 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 1025 { 1026 int *name = (int *) arg1; 1027 u_int namelen = arg2; 1028 int error; 1029 struct sysctl_oid *oid; 1030 struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 1031 struct rm_priotracker tracker; 1032 char buf[10]; 1033 1034 error = sysctl_wire_old_buffer(req, 0); 1035 if (error) 1036 return (error); 1037 1038 SYSCTL_RLOCK(&tracker); 1039 while (namelen) { 1040 if (!lsp) { 1041 snprintf(buf,sizeof(buf),"%d",*name); 1042 if (req->oldidx) 1043 error = SYSCTL_OUT(req, ".", 1); 1044 if (!error) 1045 error = SYSCTL_OUT(req, buf, strlen(buf)); 1046 if (error) 1047 goto out; 1048 namelen--; 1049 name++; 1050 continue; 1051 } 1052 lsp2 = NULL; 1053 SLIST_FOREACH(oid, lsp, oid_link) { 1054 if (oid->oid_number != *name) 1055 continue; 1056 1057 if (req->oldidx) 1058 error = SYSCTL_OUT(req, ".", 1); 1059 if (!error) 1060 error = SYSCTL_OUT(req, oid->oid_name, 1061 strlen(oid->oid_name)); 1062 if (error) 1063 goto out; 1064 1065 namelen--; 1066 name++; 1067 1068 if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1069 break; 1070 1071 if (oid->oid_handler) 1072 break; 1073 1074 lsp2 = SYSCTL_CHILDREN(oid); 1075 break; 1076 } 1077 lsp = lsp2; 1078 } 1079 error = SYSCTL_OUT(req, "", 1); 1080 out: 1081 SYSCTL_RUNLOCK(&tracker); 1082 return (error); 1083 } 1084 1085 /* 1086 * XXXRW/JA: Shouldn't return name data for nodes that we don't permit in 1087 * capability mode. 1088 */ 1089 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NAME, name, CTLFLAG_RD | 1090 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_name, ""); 1091 1092 static int 1093 sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 1094 int *next, int *len, int level, struct sysctl_oid **oidpp) 1095 { 1096 struct sysctl_oid *oidp; 1097 1098 SYSCTL_ASSERT_LOCKED(); 1099 *len = level; 1100 SLIST_FOREACH(oidp, lsp, oid_link) { 1101 *next = oidp->oid_number; 1102 *oidpp = oidp; 1103 1104 if ((oidp->oid_kind & (CTLFLAG_SKIP | CTLFLAG_DORMANT)) != 0) 1105 continue; 1106 1107 if (!namelen) { 1108 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1109 return (0); 1110 if (oidp->oid_handler) 1111 /* We really should call the handler here...*/ 1112 return (0); 1113 lsp = SYSCTL_CHILDREN(oidp); 1114 if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 1115 len, level+1, oidpp)) 1116 return (0); 1117 goto emptynode; 1118 } 1119 1120 if (oidp->oid_number < *name) 1121 continue; 1122 1123 if (oidp->oid_number > *name) { 1124 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1125 return (0); 1126 if (oidp->oid_handler) 1127 return (0); 1128 lsp = SYSCTL_CHILDREN(oidp); 1129 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 1130 next+1, len, level+1, oidpp)) 1131 return (0); 1132 goto next; 1133 } 1134 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1135 continue; 1136 1137 if (oidp->oid_handler) 1138 continue; 1139 1140 lsp = SYSCTL_CHILDREN(oidp); 1141 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 1142 len, level+1, oidpp)) 1143 return (0); 1144 next: 1145 namelen = 1; 1146 emptynode: 1147 *len = level; 1148 } 1149 return (1); 1150 } 1151 1152 static int 1153 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 1154 { 1155 int *name = (int *) arg1; 1156 u_int namelen = arg2; 1157 int i, j, error; 1158 struct sysctl_oid *oid; 1159 struct sysctl_oid_list *lsp = &sysctl__children; 1160 struct rm_priotracker tracker; 1161 int newoid[CTL_MAXNAME]; 1162 1163 SYSCTL_RLOCK(&tracker); 1164 i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 1165 SYSCTL_RUNLOCK(&tracker); 1166 if (i) 1167 return (ENOENT); 1168 error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 1169 return (error); 1170 } 1171 1172 /* 1173 * XXXRW/JA: Shouldn't return next data for nodes that we don't permit in 1174 * capability mode. 1175 */ 1176 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NEXT, next, CTLFLAG_RD | 1177 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_next, ""); 1178 1179 static int 1180 name2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp) 1181 { 1182 struct sysctl_oid *oidp; 1183 struct sysctl_oid_list *lsp = &sysctl__children; 1184 char *p; 1185 1186 SYSCTL_ASSERT_LOCKED(); 1187 1188 for (*len = 0; *len < CTL_MAXNAME;) { 1189 p = strsep(&name, "."); 1190 1191 oidp = SLIST_FIRST(lsp); 1192 for (;; oidp = SLIST_NEXT(oidp, oid_link)) { 1193 if (oidp == NULL) 1194 return (ENOENT); 1195 if (strcmp(p, oidp->oid_name) == 0) 1196 break; 1197 } 1198 *oid++ = oidp->oid_number; 1199 (*len)++; 1200 1201 if (name == NULL || *name == '\0') { 1202 if (oidpp) 1203 *oidpp = oidp; 1204 return (0); 1205 } 1206 1207 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1208 break; 1209 1210 if (oidp->oid_handler) 1211 break; 1212 1213 lsp = SYSCTL_CHILDREN(oidp); 1214 } 1215 return (ENOENT); 1216 } 1217 1218 static int 1219 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 1220 { 1221 char *p; 1222 int error, oid[CTL_MAXNAME], len = 0; 1223 struct sysctl_oid *op = NULL; 1224 struct rm_priotracker tracker; 1225 char buf[32]; 1226 1227 if (!req->newlen) 1228 return (ENOENT); 1229 if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 1230 return (ENAMETOOLONG); 1231 1232 p = buf; 1233 if (req->newlen >= sizeof(buf)) 1234 p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 1235 1236 error = SYSCTL_IN(req, p, req->newlen); 1237 if (error) { 1238 if (p != buf) 1239 free(p, M_SYSCTL); 1240 return (error); 1241 } 1242 1243 p [req->newlen] = '\0'; 1244 1245 SYSCTL_RLOCK(&tracker); 1246 error = name2oid(p, oid, &len, &op); 1247 SYSCTL_RUNLOCK(&tracker); 1248 1249 if (p != buf) 1250 free(p, M_SYSCTL); 1251 1252 if (error) 1253 return (error); 1254 1255 error = SYSCTL_OUT(req, oid, len * sizeof *oid); 1256 return (error); 1257 } 1258 1259 /* 1260 * XXXRW/JA: Shouldn't return name2oid data for nodes that we don't permit in 1261 * capability mode. 1262 */ 1263 SYSCTL_PROC(_sysctl, CTL_SYSCTL_NAME2OID, name2oid, CTLTYPE_INT | CTLFLAG_RW | 1264 CTLFLAG_ANYBODY | CTLFLAG_MPSAFE | CTLFLAG_CAPRW, 0, 0, 1265 sysctl_sysctl_name2oid, "I", ""); 1266 1267 static int 1268 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 1269 { 1270 struct sysctl_oid *oid; 1271 struct rm_priotracker tracker; 1272 int error; 1273 1274 error = sysctl_wire_old_buffer(req, 0); 1275 if (error) 1276 return (error); 1277 1278 SYSCTL_RLOCK(&tracker); 1279 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 1280 if (error) 1281 goto out; 1282 1283 if (oid->oid_fmt == NULL) { 1284 error = ENOENT; 1285 goto out; 1286 } 1287 error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 1288 if (error) 1289 goto out; 1290 error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 1291 out: 1292 SYSCTL_RUNLOCK(&tracker); 1293 return (error); 1294 } 1295 1296 1297 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDFMT, oidfmt, CTLFLAG_RD | 1298 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidfmt, ""); 1299 1300 static int 1301 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 1302 { 1303 struct sysctl_oid *oid; 1304 struct rm_priotracker tracker; 1305 int error; 1306 1307 error = sysctl_wire_old_buffer(req, 0); 1308 if (error) 1309 return (error); 1310 1311 SYSCTL_RLOCK(&tracker); 1312 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 1313 if (error) 1314 goto out; 1315 1316 if (oid->oid_descr == NULL) { 1317 error = ENOENT; 1318 goto out; 1319 } 1320 error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1); 1321 out: 1322 SYSCTL_RUNLOCK(&tracker); 1323 return (error); 1324 } 1325 1326 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDDESCR, oiddescr, CTLFLAG_RD | 1327 CTLFLAG_MPSAFE|CTLFLAG_CAPRD, sysctl_sysctl_oiddescr, ""); 1328 1329 static int 1330 sysctl_sysctl_oidlabel(SYSCTL_HANDLER_ARGS) 1331 { 1332 struct sysctl_oid *oid; 1333 struct rm_priotracker tracker; 1334 int error; 1335 1336 error = sysctl_wire_old_buffer(req, 0); 1337 if (error) 1338 return (error); 1339 1340 SYSCTL_RLOCK(&tracker); 1341 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 1342 if (error) 1343 goto out; 1344 1345 if (oid->oid_label == NULL) { 1346 error = ENOENT; 1347 goto out; 1348 } 1349 error = SYSCTL_OUT(req, oid->oid_label, strlen(oid->oid_label) + 1); 1350 out: 1351 SYSCTL_RUNLOCK(&tracker); 1352 return (error); 1353 } 1354 1355 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDLABEL, oidlabel, CTLFLAG_RD | 1356 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidlabel, ""); 1357 1358 /* 1359 * Default "handler" functions. 1360 */ 1361 1362 /* 1363 * Handle a bool. 1364 * Two cases: 1365 * a variable: point arg1 at it. 1366 * a constant: pass it in arg2. 1367 */ 1368 1369 int 1370 sysctl_handle_bool(SYSCTL_HANDLER_ARGS) 1371 { 1372 uint8_t temp; 1373 int error; 1374 1375 /* 1376 * Attempt to get a coherent snapshot by making a copy of the data. 1377 */ 1378 if (arg1) 1379 temp = *(bool *)arg1 ? 1 : 0; 1380 else 1381 temp = arg2 ? 1 : 0; 1382 1383 error = SYSCTL_OUT(req, &temp, sizeof(temp)); 1384 if (error || !req->newptr) 1385 return (error); 1386 1387 if (!arg1) 1388 error = EPERM; 1389 else { 1390 error = SYSCTL_IN(req, &temp, sizeof(temp)); 1391 if (!error) 1392 *(bool *)arg1 = temp ? 1 : 0; 1393 } 1394 return (error); 1395 } 1396 1397 /* 1398 * Handle an int8_t, signed or unsigned. 1399 * Two cases: 1400 * a variable: point arg1 at it. 1401 * a constant: pass it in arg2. 1402 */ 1403 1404 int 1405 sysctl_handle_8(SYSCTL_HANDLER_ARGS) 1406 { 1407 int8_t tmpout; 1408 int error = 0; 1409 1410 /* 1411 * Attempt to get a coherent snapshot by making a copy of the data. 1412 */ 1413 if (arg1) 1414 tmpout = *(int8_t *)arg1; 1415 else 1416 tmpout = arg2; 1417 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout)); 1418 1419 if (error || !req->newptr) 1420 return (error); 1421 1422 if (!arg1) 1423 error = EPERM; 1424 else 1425 error = SYSCTL_IN(req, arg1, sizeof(tmpout)); 1426 return (error); 1427 } 1428 1429 /* 1430 * Handle an int16_t, signed or unsigned. 1431 * Two cases: 1432 * a variable: point arg1 at it. 1433 * a constant: pass it in arg2. 1434 */ 1435 1436 int 1437 sysctl_handle_16(SYSCTL_HANDLER_ARGS) 1438 { 1439 int16_t tmpout; 1440 int error = 0; 1441 1442 /* 1443 * Attempt to get a coherent snapshot by making a copy of the data. 1444 */ 1445 if (arg1) 1446 tmpout = *(int16_t *)arg1; 1447 else 1448 tmpout = arg2; 1449 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout)); 1450 1451 if (error || !req->newptr) 1452 return (error); 1453 1454 if (!arg1) 1455 error = EPERM; 1456 else 1457 error = SYSCTL_IN(req, arg1, sizeof(tmpout)); 1458 return (error); 1459 } 1460 1461 /* 1462 * Handle an int32_t, signed or unsigned. 1463 * Two cases: 1464 * a variable: point arg1 at it. 1465 * a constant: pass it in arg2. 1466 */ 1467 1468 int 1469 sysctl_handle_32(SYSCTL_HANDLER_ARGS) 1470 { 1471 int32_t tmpout; 1472 int error = 0; 1473 1474 /* 1475 * Attempt to get a coherent snapshot by making a copy of the data. 1476 */ 1477 if (arg1) 1478 tmpout = *(int32_t *)arg1; 1479 else 1480 tmpout = arg2; 1481 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout)); 1482 1483 if (error || !req->newptr) 1484 return (error); 1485 1486 if (!arg1) 1487 error = EPERM; 1488 else 1489 error = SYSCTL_IN(req, arg1, sizeof(tmpout)); 1490 return (error); 1491 } 1492 1493 /* 1494 * Handle an int, signed or unsigned. 1495 * Two cases: 1496 * a variable: point arg1 at it. 1497 * a constant: pass it in arg2. 1498 */ 1499 1500 int 1501 sysctl_handle_int(SYSCTL_HANDLER_ARGS) 1502 { 1503 int tmpout, error = 0; 1504 1505 /* 1506 * Attempt to get a coherent snapshot by making a copy of the data. 1507 */ 1508 if (arg1) 1509 tmpout = *(int *)arg1; 1510 else 1511 tmpout = arg2; 1512 error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 1513 1514 if (error || !req->newptr) 1515 return (error); 1516 1517 if (!arg1) 1518 error = EPERM; 1519 else 1520 error = SYSCTL_IN(req, arg1, sizeof(int)); 1521 return (error); 1522 } 1523 1524 /* 1525 * Based on on sysctl_handle_int() convert milliseconds into ticks. 1526 * Note: this is used by TCP. 1527 */ 1528 1529 int 1530 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS) 1531 { 1532 int error, s, tt; 1533 1534 tt = *(int *)arg1; 1535 s = (int)((int64_t)tt * 1000 / hz); 1536 1537 error = sysctl_handle_int(oidp, &s, 0, req); 1538 if (error || !req->newptr) 1539 return (error); 1540 1541 tt = (int)((int64_t)s * hz / 1000); 1542 if (tt < 1) 1543 return (EINVAL); 1544 1545 *(int *)arg1 = tt; 1546 return (0); 1547 } 1548 1549 1550 /* 1551 * Handle a long, signed or unsigned. 1552 * Two cases: 1553 * a variable: point arg1 at it. 1554 * a constant: pass it in arg2. 1555 */ 1556 1557 int 1558 sysctl_handle_long(SYSCTL_HANDLER_ARGS) 1559 { 1560 int error = 0; 1561 long tmplong; 1562 #ifdef SCTL_MASK32 1563 int tmpint; 1564 #endif 1565 1566 /* 1567 * Attempt to get a coherent snapshot by making a copy of the data. 1568 */ 1569 if (arg1) 1570 tmplong = *(long *)arg1; 1571 else 1572 tmplong = arg2; 1573 #ifdef SCTL_MASK32 1574 if (req->flags & SCTL_MASK32) { 1575 tmpint = tmplong; 1576 error = SYSCTL_OUT(req, &tmpint, sizeof(int)); 1577 } else 1578 #endif 1579 error = SYSCTL_OUT(req, &tmplong, sizeof(long)); 1580 1581 if (error || !req->newptr) 1582 return (error); 1583 1584 if (!arg1) 1585 error = EPERM; 1586 #ifdef SCTL_MASK32 1587 else if (req->flags & SCTL_MASK32) { 1588 error = SYSCTL_IN(req, &tmpint, sizeof(int)); 1589 *(long *)arg1 = (long)tmpint; 1590 } 1591 #endif 1592 else 1593 error = SYSCTL_IN(req, arg1, sizeof(long)); 1594 return (error); 1595 } 1596 1597 /* 1598 * Handle a 64 bit int, signed or unsigned. 1599 * Two cases: 1600 * a variable: point arg1 at it. 1601 * a constant: pass it in arg2. 1602 */ 1603 int 1604 sysctl_handle_64(SYSCTL_HANDLER_ARGS) 1605 { 1606 int error = 0; 1607 uint64_t tmpout; 1608 1609 /* 1610 * Attempt to get a coherent snapshot by making a copy of the data. 1611 */ 1612 if (arg1) 1613 tmpout = *(uint64_t *)arg1; 1614 else 1615 tmpout = arg2; 1616 error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t)); 1617 1618 if (error || !req->newptr) 1619 return (error); 1620 1621 if (!arg1) 1622 error = EPERM; 1623 else 1624 error = SYSCTL_IN(req, arg1, sizeof(uint64_t)); 1625 return (error); 1626 } 1627 1628 /* 1629 * Handle our generic '\0' terminated 'C' string. 1630 * Two cases: 1631 * a variable string: point arg1 at it, arg2 is max length. 1632 * a constant string: point arg1 at it, arg2 is zero. 1633 */ 1634 1635 int 1636 sysctl_handle_string(SYSCTL_HANDLER_ARGS) 1637 { 1638 size_t outlen; 1639 int error = 0, ro_string = 0; 1640 1641 /* 1642 * A zero-length buffer indicates a fixed size read-only 1643 * string. In ddb, don't worry about trying to make a malloced 1644 * snapshot. 1645 */ 1646 if (arg2 == 0 || kdb_active) { 1647 arg2 = strlen((char *)arg1) + 1; 1648 ro_string = 1; 1649 } 1650 1651 if (req->oldptr != NULL) { 1652 char *tmparg; 1653 1654 if (ro_string) { 1655 tmparg = arg1; 1656 } else { 1657 /* try to make a coherent snapshot of the string */ 1658 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK); 1659 memcpy(tmparg, arg1, arg2); 1660 } 1661 1662 outlen = strnlen(tmparg, arg2 - 1) + 1; 1663 error = SYSCTL_OUT(req, tmparg, outlen); 1664 1665 if (!ro_string) 1666 free(tmparg, M_SYSCTLTMP); 1667 } else { 1668 outlen = strnlen((char *)arg1, arg2 - 1) + 1; 1669 error = SYSCTL_OUT(req, NULL, outlen); 1670 } 1671 if (error || !req->newptr) 1672 return (error); 1673 1674 if ((req->newlen - req->newidx) >= arg2) { 1675 error = EINVAL; 1676 } else { 1677 arg2 = (req->newlen - req->newidx); 1678 error = SYSCTL_IN(req, arg1, arg2); 1679 ((char *)arg1)[arg2] = '\0'; 1680 } 1681 return (error); 1682 } 1683 1684 /* 1685 * Handle any kind of opaque data. 1686 * arg1 points to it, arg2 is the size. 1687 */ 1688 1689 int 1690 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 1691 { 1692 int error, tries; 1693 u_int generation; 1694 struct sysctl_req req2; 1695 1696 /* 1697 * Attempt to get a coherent snapshot, by using the thread 1698 * pre-emption counter updated from within mi_switch() to 1699 * determine if we were pre-empted during a bcopy() or 1700 * copyout(). Make 3 attempts at doing this before giving up. 1701 * If we encounter an error, stop immediately. 1702 */ 1703 tries = 0; 1704 req2 = *req; 1705 retry: 1706 generation = curthread->td_generation; 1707 error = SYSCTL_OUT(req, arg1, arg2); 1708 if (error) 1709 return (error); 1710 tries++; 1711 if (generation != curthread->td_generation && tries < 3) { 1712 *req = req2; 1713 goto retry; 1714 } 1715 1716 error = SYSCTL_IN(req, arg1, arg2); 1717 1718 return (error); 1719 } 1720 1721 /* 1722 * Based on on sysctl_handle_int() convert microseconds to a sbintime. 1723 */ 1724 int 1725 sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS) 1726 { 1727 int error; 1728 int64_t tt; 1729 sbintime_t sb; 1730 1731 tt = *(int64_t *)arg1; 1732 sb = sbttous(tt); 1733 1734 error = sysctl_handle_64(oidp, &sb, 0, req); 1735 if (error || !req->newptr) 1736 return (error); 1737 1738 tt = ustosbt(sb); 1739 *(int64_t *)arg1 = tt; 1740 1741 return (0); 1742 } 1743 1744 /* 1745 * Based on on sysctl_handle_int() convert milliseconds to a sbintime. 1746 */ 1747 int 1748 sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS) 1749 { 1750 int error; 1751 int64_t tt; 1752 sbintime_t sb; 1753 1754 tt = *(int64_t *)arg1; 1755 sb = sbttoms(tt); 1756 1757 error = sysctl_handle_64(oidp, &sb, 0, req); 1758 if (error || !req->newptr) 1759 return (error); 1760 1761 tt = mstosbt(sb); 1762 *(int64_t *)arg1 = tt; 1763 1764 return (0); 1765 } 1766 1767 /* 1768 * Convert seconds to a struct timeval. Intended for use with 1769 * intervals and thus does not permit negative seconds. 1770 */ 1771 int 1772 sysctl_sec_to_timeval(SYSCTL_HANDLER_ARGS) 1773 { 1774 struct timeval *tv; 1775 int error, secs; 1776 1777 tv = arg1; 1778 secs = tv->tv_sec; 1779 1780 error = sysctl_handle_int(oidp, &secs, 0, req); 1781 if (error || req->newptr == NULL) 1782 return (error); 1783 1784 if (secs < 0) 1785 return (EINVAL); 1786 tv->tv_sec = secs; 1787 1788 return (0); 1789 } 1790 1791 /* 1792 * Transfer functions to/from kernel space. 1793 * XXX: rather untested at this point 1794 */ 1795 static int 1796 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 1797 { 1798 size_t i = 0; 1799 1800 if (req->oldptr) { 1801 i = l; 1802 if (req->oldlen <= req->oldidx) 1803 i = 0; 1804 else 1805 if (i > req->oldlen - req->oldidx) 1806 i = req->oldlen - req->oldidx; 1807 if (i > 0) 1808 bcopy(p, (char *)req->oldptr + req->oldidx, i); 1809 } 1810 req->oldidx += l; 1811 if (req->oldptr && i != l) 1812 return (ENOMEM); 1813 return (0); 1814 } 1815 1816 static int 1817 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 1818 { 1819 if (!req->newptr) 1820 return (0); 1821 if (req->newlen - req->newidx < l) 1822 return (EINVAL); 1823 bcopy((const char *)req->newptr + req->newidx, p, l); 1824 req->newidx += l; 1825 return (0); 1826 } 1827 1828 int 1829 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1830 size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags) 1831 { 1832 int error = 0; 1833 struct sysctl_req req; 1834 1835 bzero(&req, sizeof req); 1836 1837 req.td = td; 1838 req.flags = flags; 1839 1840 if (oldlenp) { 1841 req.oldlen = *oldlenp; 1842 } 1843 req.validlen = req.oldlen; 1844 1845 if (old) { 1846 req.oldptr= old; 1847 } 1848 1849 if (new != NULL) { 1850 req.newlen = newlen; 1851 req.newptr = new; 1852 } 1853 1854 req.oldfunc = sysctl_old_kernel; 1855 req.newfunc = sysctl_new_kernel; 1856 req.lock = REQ_UNWIRED; 1857 1858 error = sysctl_root(0, name, namelen, &req); 1859 1860 if (req.lock == REQ_WIRED && req.validlen > 0) 1861 vsunlock(req.oldptr, req.validlen); 1862 1863 if (error && error != ENOMEM) 1864 return (error); 1865 1866 if (retval) { 1867 if (req.oldptr && req.oldidx > req.validlen) 1868 *retval = req.validlen; 1869 else 1870 *retval = req.oldidx; 1871 } 1872 return (error); 1873 } 1874 1875 int 1876 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 1877 void *new, size_t newlen, size_t *retval, int flags) 1878 { 1879 int oid[CTL_MAXNAME]; 1880 size_t oidlen, plen; 1881 int error; 1882 1883 oid[0] = CTL_SYSCTL; 1884 oid[1] = CTL_SYSCTL_NAME2OID; 1885 oidlen = sizeof(oid); 1886 1887 error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1888 (void *)name, strlen(name), &plen, flags); 1889 if (error) 1890 return (error); 1891 1892 error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1893 new, newlen, retval, flags); 1894 return (error); 1895 } 1896 1897 /* 1898 * Transfer function to/from user space. 1899 */ 1900 static int 1901 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 1902 { 1903 size_t i, len, origidx; 1904 int error; 1905 1906 origidx = req->oldidx; 1907 req->oldidx += l; 1908 if (req->oldptr == NULL) 1909 return (0); 1910 /* 1911 * If we have not wired the user supplied buffer and we are currently 1912 * holding locks, drop a witness warning, as it's possible that 1913 * write operations to the user page can sleep. 1914 */ 1915 if (req->lock != REQ_WIRED) 1916 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1917 "sysctl_old_user()"); 1918 i = l; 1919 len = req->validlen; 1920 if (len <= origidx) 1921 i = 0; 1922 else { 1923 if (i > len - origidx) 1924 i = len - origidx; 1925 if (req->lock == REQ_WIRED) { 1926 error = copyout_nofault(p, (char *)req->oldptr + 1927 origidx, i); 1928 } else 1929 error = copyout(p, (char *)req->oldptr + origidx, i); 1930 if (error != 0) 1931 return (error); 1932 } 1933 if (i < l) 1934 return (ENOMEM); 1935 return (0); 1936 } 1937 1938 static int 1939 sysctl_new_user(struct sysctl_req *req, void *p, size_t l) 1940 { 1941 int error; 1942 1943 if (!req->newptr) 1944 return (0); 1945 if (req->newlen - req->newidx < l) 1946 return (EINVAL); 1947 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1948 "sysctl_new_user()"); 1949 error = copyin((const char *)req->newptr + req->newidx, p, l); 1950 req->newidx += l; 1951 return (error); 1952 } 1953 1954 /* 1955 * Wire the user space destination buffer. If set to a value greater than 1956 * zero, the len parameter limits the maximum amount of wired memory. 1957 */ 1958 int 1959 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1960 { 1961 int ret; 1962 size_t wiredlen; 1963 1964 wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen; 1965 ret = 0; 1966 if (req->lock != REQ_WIRED && req->oldptr && 1967 req->oldfunc == sysctl_old_user) { 1968 if (wiredlen != 0) { 1969 ret = vslock(req->oldptr, wiredlen); 1970 if (ret != 0) { 1971 if (ret != ENOMEM) 1972 return (ret); 1973 wiredlen = 0; 1974 } 1975 } 1976 req->lock = REQ_WIRED; 1977 req->validlen = wiredlen; 1978 } 1979 return (0); 1980 } 1981 1982 int 1983 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 1984 int *nindx, struct sysctl_req *req) 1985 { 1986 struct sysctl_oid_list *lsp; 1987 struct sysctl_oid *oid; 1988 int indx; 1989 1990 SYSCTL_ASSERT_LOCKED(); 1991 lsp = &sysctl__children; 1992 indx = 0; 1993 while (indx < CTL_MAXNAME) { 1994 SLIST_FOREACH(oid, lsp, oid_link) { 1995 if (oid->oid_number == name[indx]) 1996 break; 1997 } 1998 if (oid == NULL) 1999 return (ENOENT); 2000 2001 indx++; 2002 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2003 if (oid->oid_handler != NULL || indx == namelen) { 2004 *noid = oid; 2005 if (nindx != NULL) 2006 *nindx = indx; 2007 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 2008 ("%s found DYING node %p", __func__, oid)); 2009 return (0); 2010 } 2011 lsp = SYSCTL_CHILDREN(oid); 2012 } else if (indx == namelen) { 2013 if ((oid->oid_kind & CTLFLAG_DORMANT) != 0) 2014 return (ENOENT); 2015 *noid = oid; 2016 if (nindx != NULL) 2017 *nindx = indx; 2018 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 2019 ("%s found DYING node %p", __func__, oid)); 2020 return (0); 2021 } else { 2022 return (ENOTDIR); 2023 } 2024 } 2025 return (ENOENT); 2026 } 2027 2028 /* 2029 * Traverse our tree, and find the right node, execute whatever it points 2030 * to, and return the resulting error code. 2031 */ 2032 2033 static int 2034 sysctl_root(SYSCTL_HANDLER_ARGS) 2035 { 2036 struct sysctl_oid *oid; 2037 struct rm_priotracker tracker; 2038 int error, indx, lvl; 2039 2040 SYSCTL_RLOCK(&tracker); 2041 2042 error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 2043 if (error) 2044 goto out; 2045 2046 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2047 /* 2048 * You can't call a sysctl when it's a node, but has 2049 * no handler. Inform the user that it's a node. 2050 * The indx may or may not be the same as namelen. 2051 */ 2052 if (oid->oid_handler == NULL) { 2053 error = EISDIR; 2054 goto out; 2055 } 2056 } 2057 2058 /* Is this sysctl writable? */ 2059 if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) { 2060 error = EPERM; 2061 goto out; 2062 } 2063 2064 KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 2065 2066 #ifdef CAPABILITY_MODE 2067 /* 2068 * If the process is in capability mode, then don't permit reading or 2069 * writing unless specifically granted for the node. 2070 */ 2071 if (IN_CAPABILITY_MODE(req->td)) { 2072 if ((req->oldptr && !(oid->oid_kind & CTLFLAG_CAPRD)) || 2073 (req->newptr && !(oid->oid_kind & CTLFLAG_CAPWR))) { 2074 error = EPERM; 2075 goto out; 2076 } 2077 } 2078 #endif 2079 2080 /* Is this sysctl sensitive to securelevels? */ 2081 if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 2082 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 2083 error = securelevel_gt(req->td->td_ucred, lvl); 2084 if (error) 2085 goto out; 2086 } 2087 2088 /* Is this sysctl writable by only privileged users? */ 2089 if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 2090 int priv; 2091 2092 if (oid->oid_kind & CTLFLAG_PRISON) 2093 priv = PRIV_SYSCTL_WRITEJAIL; 2094 #ifdef VIMAGE 2095 else if ((oid->oid_kind & CTLFLAG_VNET) && 2096 prison_owns_vnet(req->td->td_ucred)) 2097 priv = PRIV_SYSCTL_WRITEJAIL; 2098 #endif 2099 else 2100 priv = PRIV_SYSCTL_WRITE; 2101 error = priv_check(req->td, priv); 2102 if (error) 2103 goto out; 2104 } 2105 2106 if (!oid->oid_handler) { 2107 error = EINVAL; 2108 goto out; 2109 } 2110 2111 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2112 arg1 = (int *)arg1 + indx; 2113 arg2 -= indx; 2114 } else { 2115 arg1 = oid->oid_arg1; 2116 arg2 = oid->oid_arg2; 2117 } 2118 #ifdef MAC 2119 error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2, 2120 req); 2121 if (error != 0) 2122 goto out; 2123 #endif 2124 #ifdef VIMAGE 2125 if ((oid->oid_kind & CTLFLAG_VNET) && arg1 != NULL) 2126 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1); 2127 #endif 2128 error = sysctl_root_handler_locked(oid, arg1, arg2, req, &tracker); 2129 2130 out: 2131 SYSCTL_RUNLOCK(&tracker); 2132 return (error); 2133 } 2134 2135 #ifndef _SYS_SYSPROTO_H_ 2136 struct sysctl_args { 2137 int *name; 2138 u_int namelen; 2139 void *old; 2140 size_t *oldlenp; 2141 void *new; 2142 size_t newlen; 2143 }; 2144 #endif 2145 int 2146 sys___sysctl(struct thread *td, struct sysctl_args *uap) 2147 { 2148 int error, i, name[CTL_MAXNAME]; 2149 size_t j; 2150 2151 if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 2152 return (EINVAL); 2153 2154 error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 2155 if (error) 2156 return (error); 2157 2158 error = userland_sysctl(td, name, uap->namelen, 2159 uap->old, uap->oldlenp, 0, 2160 uap->new, uap->newlen, &j, 0); 2161 if (error && error != ENOMEM) 2162 return (error); 2163 if (uap->oldlenp) { 2164 i = copyout(&j, uap->oldlenp, sizeof(j)); 2165 if (i) 2166 return (i); 2167 } 2168 return (error); 2169 } 2170 2171 int 2172 kern___sysctlbyname(struct thread *td, const char *oname, size_t namelen, 2173 void *old, size_t *oldlenp, void *new, size_t newlen, size_t *retval, 2174 int flags, bool inkernel) 2175 { 2176 int oid[CTL_MAXNAME]; 2177 char namebuf[16]; 2178 char *name; 2179 size_t oidlen; 2180 int error; 2181 2182 if (namelen > MAXPATHLEN || namelen == 0) 2183 return (EINVAL); 2184 name = namebuf; 2185 if (namelen > sizeof(namebuf)) 2186 name = malloc(namelen, M_SYSCTL, M_WAITOK); 2187 error = copyin(oname, name, namelen); 2188 if (error != 0) 2189 goto out; 2190 2191 oid[0] = CTL_SYSCTL; 2192 oid[1] = CTL_SYSCTL_NAME2OID; 2193 oidlen = sizeof(oid); 2194 error = kernel_sysctl(td, oid, 2, oid, &oidlen, (void *)name, namelen, 2195 retval, flags); 2196 if (error != 0) 2197 goto out; 2198 error = userland_sysctl(td, oid, *retval / sizeof(int), old, oldlenp, 2199 inkernel, new, newlen, retval, flags); 2200 2201 out: 2202 if (namelen > sizeof(namebuf)) 2203 free(name, M_SYSCTL); 2204 return (error); 2205 } 2206 2207 #ifndef _SYS_SYSPROTO_H_ 2208 struct __sysctlbyname_args { 2209 const char *name; 2210 size_t namelen; 2211 void *old; 2212 size_t *oldlenp; 2213 void *new; 2214 size_t newlen; 2215 }; 2216 #endif 2217 int 2218 sys___sysctlbyname(struct thread *td, struct __sysctlbyname_args *uap) 2219 { 2220 size_t rv; 2221 int error; 2222 2223 error = kern___sysctlbyname(td, uap->name, uap->namelen, uap->old, 2224 uap->oldlenp, uap->new, uap->newlen, &rv, 0, 0); 2225 if (error != 0) 2226 return (error); 2227 if (uap->oldlenp != NULL) 2228 error = copyout(&rv, uap->oldlenp, sizeof(rv)); 2229 2230 return (error); 2231 } 2232 2233 /* 2234 * This is used from various compatibility syscalls too. That's why name 2235 * must be in kernel space. 2236 */ 2237 int 2238 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 2239 size_t *oldlenp, int inkernel, const void *new, size_t newlen, 2240 size_t *retval, int flags) 2241 { 2242 int error = 0, memlocked; 2243 struct sysctl_req req; 2244 2245 bzero(&req, sizeof req); 2246 2247 req.td = td; 2248 req.flags = flags; 2249 2250 if (oldlenp) { 2251 if (inkernel) { 2252 req.oldlen = *oldlenp; 2253 } else { 2254 error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 2255 if (error) 2256 return (error); 2257 } 2258 } 2259 req.validlen = req.oldlen; 2260 req.oldptr = old; 2261 2262 if (new != NULL) { 2263 req.newlen = newlen; 2264 req.newptr = new; 2265 } 2266 2267 req.oldfunc = sysctl_old_user; 2268 req.newfunc = sysctl_new_user; 2269 req.lock = REQ_UNWIRED; 2270 2271 #ifdef KTRACE 2272 if (KTRPOINT(curthread, KTR_SYSCTL)) 2273 ktrsysctl(name, namelen); 2274 #endif 2275 memlocked = 0; 2276 if (req.oldptr && req.oldlen > 4 * PAGE_SIZE) { 2277 memlocked = 1; 2278 sx_xlock(&sysctlmemlock); 2279 } 2280 CURVNET_SET(TD_TO_VNET(td)); 2281 2282 for (;;) { 2283 req.oldidx = 0; 2284 req.newidx = 0; 2285 error = sysctl_root(0, name, namelen, &req); 2286 if (error != EAGAIN) 2287 break; 2288 kern_yield(PRI_USER); 2289 } 2290 2291 CURVNET_RESTORE(); 2292 2293 if (req.lock == REQ_WIRED && req.validlen > 0) 2294 vsunlock(req.oldptr, req.validlen); 2295 if (memlocked) 2296 sx_xunlock(&sysctlmemlock); 2297 2298 if (error && error != ENOMEM) 2299 return (error); 2300 2301 if (retval) { 2302 if (req.oldptr && req.oldidx > req.validlen) 2303 *retval = req.validlen; 2304 else 2305 *retval = req.oldidx; 2306 } 2307 return (error); 2308 } 2309 2310 /* 2311 * Drain into a sysctl struct. The user buffer should be wired if a page 2312 * fault would cause issue. 2313 */ 2314 static int 2315 sbuf_sysctl_drain(void *arg, const char *data, int len) 2316 { 2317 struct sysctl_req *req = arg; 2318 int error; 2319 2320 error = SYSCTL_OUT(req, data, len); 2321 KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 2322 return (error == 0 ? len : -error); 2323 } 2324 2325 struct sbuf * 2326 sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 2327 struct sysctl_req *req) 2328 { 2329 2330 /* Supply a default buffer size if none given. */ 2331 if (buf == NULL && length == 0) 2332 length = 64; 2333 s = sbuf_new(s, buf, length, SBUF_FIXEDLEN | SBUF_INCLUDENUL); 2334 sbuf_set_drain(s, sbuf_sysctl_drain, req); 2335 return (s); 2336 } 2337 2338 #ifdef DDB 2339 2340 /* The current OID the debugger is working with */ 2341 static struct sysctl_oid *g_ddb_oid; 2342 2343 /* The current flags specified by the user */ 2344 static int g_ddb_sysctl_flags; 2345 2346 /* Check to see if the last sysctl printed */ 2347 static int g_ddb_sysctl_printed; 2348 2349 static const int ctl_sign[CTLTYPE+1] = { 2350 [CTLTYPE_INT] = 1, 2351 [CTLTYPE_LONG] = 1, 2352 [CTLTYPE_S8] = 1, 2353 [CTLTYPE_S16] = 1, 2354 [CTLTYPE_S32] = 1, 2355 [CTLTYPE_S64] = 1, 2356 }; 2357 2358 static const int ctl_size[CTLTYPE+1] = { 2359 [CTLTYPE_INT] = sizeof(int), 2360 [CTLTYPE_UINT] = sizeof(u_int), 2361 [CTLTYPE_LONG] = sizeof(long), 2362 [CTLTYPE_ULONG] = sizeof(u_long), 2363 [CTLTYPE_S8] = sizeof(int8_t), 2364 [CTLTYPE_S16] = sizeof(int16_t), 2365 [CTLTYPE_S32] = sizeof(int32_t), 2366 [CTLTYPE_S64] = sizeof(int64_t), 2367 [CTLTYPE_U8] = sizeof(uint8_t), 2368 [CTLTYPE_U16] = sizeof(uint16_t), 2369 [CTLTYPE_U32] = sizeof(uint32_t), 2370 [CTLTYPE_U64] = sizeof(uint64_t), 2371 }; 2372 2373 #define DB_SYSCTL_NAME_ONLY 0x001 /* Compare with -N */ 2374 #define DB_SYSCTL_VALUE_ONLY 0x002 /* Compare with -n */ 2375 #define DB_SYSCTL_OPAQUE 0x004 /* Compare with -o */ 2376 #define DB_SYSCTL_HEX 0x008 /* Compare with -x */ 2377 2378 #define DB_SYSCTL_SAFE_ONLY 0x100 /* Only simple types */ 2379 2380 static const char db_sysctl_modifs[] = { 2381 'N', 'n', 'o', 'x', 2382 }; 2383 2384 static const int db_sysctl_modif_values[] = { 2385 DB_SYSCTL_NAME_ONLY, DB_SYSCTL_VALUE_ONLY, 2386 DB_SYSCTL_OPAQUE, DB_SYSCTL_HEX, 2387 }; 2388 2389 /* Handlers considered safe to print while recursing */ 2390 static int (* const db_safe_handlers[])(SYSCTL_HANDLER_ARGS) = { 2391 sysctl_handle_bool, 2392 sysctl_handle_8, 2393 sysctl_handle_16, 2394 sysctl_handle_32, 2395 sysctl_handle_64, 2396 sysctl_handle_int, 2397 sysctl_handle_long, 2398 sysctl_handle_string, 2399 sysctl_handle_opaque, 2400 }; 2401 2402 /* 2403 * Use in place of sysctl_old_kernel to print sysctl values. 2404 * 2405 * Compare to the output handling in show_var from sbin/sysctl/sysctl.c 2406 */ 2407 static int 2408 sysctl_old_ddb(struct sysctl_req *req, const void *ptr, size_t len) 2409 { 2410 const u_char *val, *p; 2411 const char *sep1; 2412 size_t intlen, slen; 2413 uintmax_t umv; 2414 intmax_t mv; 2415 int sign, ctltype, hexlen, xflag, error; 2416 2417 /* Suppress false-positive GCC uninitialized variable warnings */ 2418 mv = 0; 2419 umv = 0; 2420 2421 slen = len; 2422 val = p = ptr; 2423 2424 if (ptr == NULL) { 2425 error = 0; 2426 goto out; 2427 } 2428 2429 /* We are going to print */ 2430 g_ddb_sysctl_printed = 1; 2431 2432 xflag = g_ddb_sysctl_flags & DB_SYSCTL_HEX; 2433 2434 ctltype = (g_ddb_oid->oid_kind & CTLTYPE); 2435 sign = ctl_sign[ctltype]; 2436 intlen = ctl_size[ctltype]; 2437 2438 switch (ctltype) { 2439 case CTLTYPE_NODE: 2440 case CTLTYPE_STRING: 2441 db_printf("%.*s", (int) len, (const char *) p); 2442 error = 0; 2443 goto out; 2444 2445 case CTLTYPE_INT: 2446 case CTLTYPE_UINT: 2447 case CTLTYPE_LONG: 2448 case CTLTYPE_ULONG: 2449 case CTLTYPE_S8: 2450 case CTLTYPE_S16: 2451 case CTLTYPE_S32: 2452 case CTLTYPE_S64: 2453 case CTLTYPE_U8: 2454 case CTLTYPE_U16: 2455 case CTLTYPE_U32: 2456 case CTLTYPE_U64: 2457 hexlen = 2 + (intlen * CHAR_BIT + 3) / 4; 2458 sep1 = ""; 2459 while (len >= intlen) { 2460 switch (ctltype) { 2461 case CTLTYPE_INT: 2462 case CTLTYPE_UINT: 2463 umv = *(const u_int *)p; 2464 mv = *(const int *)p; 2465 break; 2466 case CTLTYPE_LONG: 2467 case CTLTYPE_ULONG: 2468 umv = *(const u_long *)p; 2469 mv = *(const long *)p; 2470 break; 2471 case CTLTYPE_S8: 2472 case CTLTYPE_U8: 2473 umv = *(const uint8_t *)p; 2474 mv = *(const int8_t *)p; 2475 break; 2476 case CTLTYPE_S16: 2477 case CTLTYPE_U16: 2478 umv = *(const uint16_t *)p; 2479 mv = *(const int16_t *)p; 2480 break; 2481 case CTLTYPE_S32: 2482 case CTLTYPE_U32: 2483 umv = *(const uint32_t *)p; 2484 mv = *(const int32_t *)p; 2485 break; 2486 case CTLTYPE_S64: 2487 case CTLTYPE_U64: 2488 umv = *(const uint64_t *)p; 2489 mv = *(const int64_t *)p; 2490 break; 2491 } 2492 2493 db_printf("%s", sep1); 2494 if (xflag) 2495 db_printf("%#0*jx", hexlen, umv); 2496 else if (!sign) 2497 db_printf("%ju", umv); 2498 else if (g_ddb_oid->oid_fmt[1] == 'K') { 2499 /* Kelvins are currently unsupported. */ 2500 error = EOPNOTSUPP; 2501 goto out; 2502 } else 2503 db_printf("%jd", mv); 2504 2505 sep1 = " "; 2506 len -= intlen; 2507 p += intlen; 2508 } 2509 error = 0; 2510 goto out; 2511 2512 case CTLTYPE_OPAQUE: 2513 /* TODO: Support struct functions. */ 2514 2515 /* FALLTHROUGH */ 2516 default: 2517 db_printf("Format:%s Length:%zu Dump:0x", 2518 g_ddb_oid->oid_fmt, len); 2519 while (len-- && (xflag || p < val + 16)) 2520 db_printf("%02x", *p++); 2521 if (!xflag && len > 16) 2522 db_printf("..."); 2523 error = 0; 2524 goto out; 2525 } 2526 2527 out: 2528 req->oldidx += slen; 2529 return (error); 2530 } 2531 2532 /* 2533 * Avoid setting new sysctl values from the debugger 2534 */ 2535 static int 2536 sysctl_new_ddb(struct sysctl_req *req, void *p, size_t l) 2537 { 2538 2539 if (!req->newptr) 2540 return (0); 2541 2542 /* Changing sysctls from the debugger is currently unsupported */ 2543 return (EPERM); 2544 } 2545 2546 /* 2547 * Run a sysctl handler with the DDB oldfunc and newfunc attached. 2548 * Instead of copying any output to a buffer we'll dump it right to 2549 * the console. 2550 */ 2551 static int 2552 db_sysctl(struct sysctl_oid *oidp, int *name, u_int namelen, 2553 void *old, size_t *oldlenp, size_t *retval, int flags) 2554 { 2555 struct sysctl_req req; 2556 int error; 2557 2558 /* Setup the request */ 2559 bzero(&req, sizeof req); 2560 req.td = kdb_thread; 2561 req.oldfunc = sysctl_old_ddb; 2562 req.newfunc = sysctl_new_ddb; 2563 req.lock = REQ_UNWIRED; 2564 if (oldlenp) { 2565 req.oldlen = *oldlenp; 2566 } 2567 req.validlen = req.oldlen; 2568 if (old) { 2569 req.oldptr = old; 2570 } 2571 2572 /* Setup our globals for sysctl_old_ddb */ 2573 g_ddb_oid = oidp; 2574 g_ddb_sysctl_flags = flags; 2575 g_ddb_sysctl_printed = 0; 2576 2577 error = sysctl_root(0, name, namelen, &req); 2578 2579 /* Reset globals */ 2580 g_ddb_oid = NULL; 2581 g_ddb_sysctl_flags = 0; 2582 2583 if (retval) { 2584 if (req.oldptr && req.oldidx > req.validlen) 2585 *retval = req.validlen; 2586 else 2587 *retval = req.oldidx; 2588 } 2589 return (error); 2590 } 2591 2592 /* 2593 * Show a sysctl's name 2594 */ 2595 static void 2596 db_show_oid_name(int *oid, size_t nlen) 2597 { 2598 struct sysctl_oid *oidp; 2599 int qoid[CTL_MAXNAME+2]; 2600 int error; 2601 2602 qoid[0] = 0; 2603 memcpy(qoid + 2, oid, nlen * sizeof(int)); 2604 qoid[1] = 1; 2605 2606 error = sysctl_find_oid(qoid, nlen + 2, &oidp, NULL, NULL); 2607 if (error) 2608 db_error("sysctl name oid"); 2609 2610 error = db_sysctl(oidp, qoid, nlen + 2, NULL, NULL, NULL, 0); 2611 if (error) 2612 db_error("sysctl name"); 2613 } 2614 2615 /* 2616 * Check to see if an OID is safe to print from ddb. 2617 */ 2618 static bool 2619 db_oid_safe(const struct sysctl_oid *oidp) 2620 { 2621 for (unsigned int i = 0; i < nitems(db_safe_handlers); ++i) { 2622 if (oidp->oid_handler == db_safe_handlers[i]) 2623 return (true); 2624 } 2625 2626 return (false); 2627 } 2628 2629 /* 2630 * Show a sysctl at a specific OID 2631 * Compare to the input handling in show_var from sbin/sysctl/sysctl.c 2632 */ 2633 static int 2634 db_show_oid(struct sysctl_oid *oidp, int *oid, size_t nlen, int flags) 2635 { 2636 int error, xflag, oflag, Nflag, nflag; 2637 size_t len; 2638 2639 xflag = flags & DB_SYSCTL_HEX; 2640 oflag = flags & DB_SYSCTL_OPAQUE; 2641 nflag = flags & DB_SYSCTL_VALUE_ONLY; 2642 Nflag = flags & DB_SYSCTL_NAME_ONLY; 2643 2644 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_OPAQUE && 2645 (!xflag && !oflag)) 2646 return (0); 2647 2648 if (Nflag) { 2649 db_show_oid_name(oid, nlen); 2650 error = 0; 2651 goto out; 2652 } 2653 2654 if (!nflag) { 2655 db_show_oid_name(oid, nlen); 2656 db_printf(": "); 2657 } 2658 2659 if ((flags & DB_SYSCTL_SAFE_ONLY) && !db_oid_safe(oidp)) { 2660 db_printf("Skipping, unsafe to print while recursing."); 2661 error = 0; 2662 goto out; 2663 } 2664 2665 /* Try once, and ask about the size */ 2666 len = 0; 2667 error = db_sysctl(oidp, oid, nlen, 2668 NULL, NULL, &len, flags); 2669 if (error) 2670 goto out; 2671 2672 if (!g_ddb_sysctl_printed) 2673 /* Lie about the size */ 2674 error = db_sysctl(oidp, oid, nlen, 2675 (void *) 1, &len, NULL, flags); 2676 2677 out: 2678 db_printf("\n"); 2679 return (error); 2680 } 2681 2682 /* 2683 * Show all sysctls under a specific OID 2684 * Compare to sysctl_all from sbin/sysctl/sysctl.c 2685 */ 2686 static int 2687 db_show_sysctl_all(int *oid, size_t len, int flags) 2688 { 2689 struct sysctl_oid *oidp; 2690 int name1[CTL_MAXNAME + 2], name2[CTL_MAXNAME + 2]; 2691 size_t l1, l2; 2692 2693 name1[0] = CTL_SYSCTL; 2694 name1[1] = CTL_SYSCTL_NEXT; 2695 l1 = 2; 2696 if (len) { 2697 memcpy(name1+2, oid, len * sizeof(int)); 2698 l1 +=len; 2699 } else { 2700 name1[2] = 1; 2701 l1++; 2702 } 2703 for (;;) { 2704 int i, error; 2705 2706 l2 = sizeof(name2); 2707 error = kernel_sysctl(kdb_thread, name1, l1, 2708 name2, &l2, NULL, 0, &l2, 0); 2709 if (error != 0) { 2710 if (error == ENOENT) 2711 return (0); 2712 else 2713 db_error("sysctl(getnext)"); 2714 } 2715 2716 l2 /= sizeof(int); 2717 2718 if (l2 < (unsigned int)len) 2719 return (0); 2720 2721 for (i = 0; i < len; i++) 2722 if (name2[i] != oid[i]) 2723 return (0); 2724 2725 /* Find the OID in question */ 2726 error = sysctl_find_oid(name2, l2, &oidp, NULL, NULL); 2727 if (error) 2728 return (error); 2729 2730 i = db_show_oid(oidp, name2, l2, flags | DB_SYSCTL_SAFE_ONLY); 2731 2732 if (db_pager_quit) 2733 return (0); 2734 2735 memcpy(name1+2, name2, l2 * sizeof(int)); 2736 l1 = 2 + l2; 2737 } 2738 } 2739 2740 /* 2741 * Show a sysctl by its user facing string 2742 */ 2743 static int 2744 db_sysctlbyname(char *name, int flags) 2745 { 2746 struct sysctl_oid *oidp; 2747 int oid[CTL_MAXNAME]; 2748 int error, nlen; 2749 2750 error = name2oid(name, oid, &nlen, &oidp); 2751 if (error) { 2752 return (error); 2753 } 2754 2755 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2756 db_show_sysctl_all(oid, nlen, flags); 2757 } else { 2758 error = db_show_oid(oidp, oid, nlen, flags); 2759 } 2760 2761 return (error); 2762 } 2763 2764 static void 2765 db_sysctl_cmd_usage(void) 2766 { 2767 db_printf( 2768 " sysctl [/Nnox] <sysctl> \n" 2769 " \n" 2770 " <sysctl> The name of the sysctl to show. \n" 2771 " \n" 2772 " Show a sysctl by hooking into SYSCTL_IN and SYSCTL_OUT. \n" 2773 " This will work for most sysctls, but should not be used \n" 2774 " with sysctls that are known to malloc. \n" 2775 " \n" 2776 " While recursing any \"unsafe\" sysctls will be skipped. \n" 2777 " Call sysctl directly on the sysctl to try printing the \n" 2778 " skipped sysctl. This is unsafe and may make the ddb \n" 2779 " session unusable. \n" 2780 " \n" 2781 " Arguments: \n" 2782 " /N Display only the name of the sysctl. \n" 2783 " /n Display only the value of the sysctl. \n" 2784 " /o Display opaque values. \n" 2785 " /x Display the sysctl in hex. \n" 2786 " \n" 2787 "For example: \n" 2788 "sysctl vm.v_free_min \n" 2789 "vn.v_free_min: 12669 \n" 2790 ); 2791 } 2792 2793 /* 2794 * Show a specific sysctl similar to sysctl (8). 2795 */ 2796 DB_FUNC(sysctl, db_sysctl_cmd, db_cmd_table, CS_OWN, NULL) 2797 { 2798 char name[TOK_STRING_SIZE]; 2799 int error, i, t, flags; 2800 2801 /* Parse the modifiers */ 2802 t = db_read_token(); 2803 if (t == tSLASH || t == tMINUS) { 2804 t = db_read_token(); 2805 if (t != tIDENT) { 2806 db_printf("Bad modifier\n"); 2807 error = EINVAL; 2808 goto out; 2809 } 2810 db_strcpy(modif, db_tok_string); 2811 } 2812 else { 2813 db_unread_token(t); 2814 modif[0] = '\0'; 2815 } 2816 2817 flags = 0; 2818 for (i = 0; i < nitems(db_sysctl_modifs); i++) { 2819 if (strchr(modif, db_sysctl_modifs[i])) { 2820 flags |= db_sysctl_modif_values[i]; 2821 } 2822 } 2823 2824 /* Parse the sysctl names */ 2825 t = db_read_token(); 2826 if (t != tIDENT) { 2827 db_printf("Need sysctl name\n"); 2828 error = EINVAL; 2829 goto out; 2830 } 2831 2832 /* Copy the name into a temporary buffer */ 2833 db_strcpy(name, db_tok_string); 2834 2835 /* Ensure there is no trailing cruft */ 2836 t = db_read_token(); 2837 if (t != tEOL) { 2838 db_printf("Unexpected sysctl argument\n"); 2839 error = EINVAL; 2840 goto out; 2841 } 2842 2843 error = db_sysctlbyname(name, flags); 2844 if (error == ENOENT) { 2845 db_printf("unknown oid: '%s'\n", db_tok_string); 2846 goto out; 2847 } else if (error) { 2848 db_printf("%s: error: %d\n", db_tok_string, error); 2849 goto out; 2850 } 2851 2852 out: 2853 /* Ensure we eat all of our text */ 2854 db_flush_lex(); 2855 2856 if (error == EINVAL) { 2857 db_sysctl_cmd_usage(); 2858 } 2859 } 2860 2861 #endif /* DDB */ 2862