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 static int 741 sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse) 742 { 743 struct sysctl_oid *p, *tmp; 744 int error; 745 746 SYSCTL_ASSERT_WLOCKED(); 747 if (oidp == NULL) 748 return(EINVAL); 749 if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 750 printf("Warning: can't remove non-dynamic nodes (%s)!\n", 751 oidp->oid_name); 752 return (EINVAL); 753 } 754 /* 755 * WARNING: normal method to do this should be through 756 * sysctl_ctx_free(). Use recursing as the last resort 757 * method to purge your sysctl tree of leftovers... 758 * However, if some other code still references these nodes, 759 * it will panic. 760 */ 761 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 762 if (oidp->oid_refcnt == 1) { 763 SLIST_FOREACH_SAFE(p, 764 SYSCTL_CHILDREN(oidp), oid_link, tmp) { 765 if (!recurse) { 766 printf("Warning: failed attempt to " 767 "remove oid %s with child %s\n", 768 oidp->oid_name, p->oid_name); 769 return (ENOTEMPTY); 770 } 771 error = sysctl_remove_oid_locked(p, del, 772 recurse); 773 if (error) 774 return (error); 775 } 776 } 777 } 778 if (oidp->oid_refcnt > 1 ) { 779 oidp->oid_refcnt--; 780 } else { 781 if (oidp->oid_refcnt == 0) { 782 printf("Warning: bad oid_refcnt=%u (%s)!\n", 783 oidp->oid_refcnt, oidp->oid_name); 784 return (EINVAL); 785 } 786 sysctl_unregister_oid(oidp); 787 if (del) { 788 /* 789 * Wait for all threads running the handler to drain. 790 * This preserves the previous behavior when the 791 * sysctl lock was held across a handler invocation, 792 * and is necessary for module unload correctness. 793 */ 794 while (oidp->oid_running > 0) { 795 oidp->oid_kind |= CTLFLAG_DYING; 796 SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0); 797 } 798 if (oidp->oid_descr) 799 free(__DECONST(char *, oidp->oid_descr), 800 M_SYSCTLOID); 801 if (oidp->oid_label) 802 free(__DECONST(char *, oidp->oid_label), 803 M_SYSCTLOID); 804 free(__DECONST(char *, oidp->oid_name), M_SYSCTLOID); 805 free(oidp, M_SYSCTLOID); 806 } 807 } 808 return (0); 809 } 810 /* 811 * Create new sysctls at run time. 812 * clist may point to a valid context initialized with sysctl_ctx_init(). 813 */ 814 struct sysctl_oid * 815 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 816 int number, const char *name, int kind, void *arg1, intmax_t arg2, 817 int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr, 818 const char *label) 819 { 820 struct sysctl_oid *oidp; 821 822 /* You have to hook up somewhere.. */ 823 if (parent == NULL) 824 return(NULL); 825 /* Check if the node already exists, otherwise create it */ 826 SYSCTL_WLOCK(); 827 oidp = sysctl_find_oidname(name, parent); 828 if (oidp != NULL) { 829 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 830 oidp->oid_refcnt++; 831 /* Update the context */ 832 if (clist != NULL) 833 sysctl_ctx_entry_add(clist, oidp); 834 SYSCTL_WUNLOCK(); 835 return (oidp); 836 } else { 837 sysctl_warn_reuse(__func__, oidp); 838 SYSCTL_WUNLOCK(); 839 return (NULL); 840 } 841 } 842 oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 843 oidp->oid_parent = parent; 844 SLIST_INIT(&oidp->oid_children); 845 oidp->oid_number = number; 846 oidp->oid_refcnt = 1; 847 oidp->oid_name = strdup(name, M_SYSCTLOID); 848 oidp->oid_handler = handler; 849 oidp->oid_kind = CTLFLAG_DYN | kind; 850 oidp->oid_arg1 = arg1; 851 oidp->oid_arg2 = arg2; 852 oidp->oid_fmt = fmt; 853 if (descr != NULL) 854 oidp->oid_descr = strdup(descr, M_SYSCTLOID); 855 if (label != NULL) 856 oidp->oid_label = strdup(label, M_SYSCTLOID); 857 /* Update the context, if used */ 858 if (clist != NULL) 859 sysctl_ctx_entry_add(clist, oidp); 860 /* Register this oid */ 861 sysctl_register_oid(oidp); 862 SYSCTL_WUNLOCK(); 863 return (oidp); 864 } 865 866 /* 867 * Rename an existing oid. 868 */ 869 void 870 sysctl_rename_oid(struct sysctl_oid *oidp, const char *name) 871 { 872 char *newname; 873 char *oldname; 874 875 newname = strdup(name, M_SYSCTLOID); 876 SYSCTL_WLOCK(); 877 oldname = __DECONST(char *, oidp->oid_name); 878 oidp->oid_name = newname; 879 SYSCTL_WUNLOCK(); 880 free(oldname, M_SYSCTLOID); 881 } 882 883 /* 884 * Reparent an existing oid. 885 */ 886 int 887 sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent) 888 { 889 struct sysctl_oid *oidp; 890 891 SYSCTL_WLOCK(); 892 if (oid->oid_parent == parent) { 893 SYSCTL_WUNLOCK(); 894 return (0); 895 } 896 oidp = sysctl_find_oidname(oid->oid_name, parent); 897 if (oidp != NULL) { 898 SYSCTL_WUNLOCK(); 899 return (EEXIST); 900 } 901 sysctl_unregister_oid(oid); 902 oid->oid_parent = parent; 903 oid->oid_number = OID_AUTO; 904 sysctl_register_oid(oid); 905 SYSCTL_WUNLOCK(); 906 return (0); 907 } 908 909 /* 910 * Register the kernel's oids on startup. 911 */ 912 SET_DECLARE(sysctl_set, struct sysctl_oid); 913 914 static void 915 sysctl_register_all(void *arg) 916 { 917 struct sysctl_oid **oidp; 918 919 sx_init(&sysctlmemlock, "sysctl mem"); 920 SYSCTL_INIT(); 921 SYSCTL_WLOCK(); 922 SET_FOREACH(oidp, sysctl_set) 923 sysctl_register_oid(*oidp); 924 SYSCTL_WUNLOCK(); 925 } 926 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_FIRST, sysctl_register_all, NULL); 927 928 /* 929 * "Staff-functions" 930 * 931 * These functions implement a presently undocumented interface 932 * used by the sysctl program to walk the tree, and get the type 933 * so it can print the value. 934 * This interface is under work and consideration, and should probably 935 * be killed with a big axe by the first person who can find the time. 936 * (be aware though, that the proper interface isn't as obvious as it 937 * may seem, there are various conflicting requirements. 938 * 939 * {CTL_SYSCTL, CTL_SYSCTL_DEBUG} printf the entire MIB-tree. 940 * {CTL_SYSCTL, CTL_SYSCTL_NAME, ...} return the name of the "..." 941 * OID. 942 * {CTL_SYSCTL, CTL_SYSCTL_NEXT, ...} return the next OID. 943 * {CTL_SYSCTL, CTL_SYSCTL_NAME2OID} return the OID of the name in 944 * "new" 945 * {CTL_SYSCTL, CTL_SYSCTL_OIDFMT, ...} return the kind & format info 946 * for the "..." OID. 947 * {CTL_SYSCTL, CTL_SYSCTL_OIDDESCR, ...} return the description of the 948 * "..." OID. 949 * {CTL_SYSCTL, CTL_SYSCTL_OIDLABEL, ...} return the aggregation label of 950 * the "..." OID. 951 */ 952 953 #ifdef SYSCTL_DEBUG 954 static void 955 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 956 { 957 int k; 958 struct sysctl_oid *oidp; 959 960 SYSCTL_ASSERT_LOCKED(); 961 SLIST_FOREACH(oidp, l, oid_link) { 962 963 for (k=0; k<i; k++) 964 printf(" "); 965 966 printf("%d %s ", oidp->oid_number, oidp->oid_name); 967 968 printf("%c%c", 969 oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 970 oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 971 972 if (oidp->oid_handler) 973 printf(" *Handler"); 974 975 switch (oidp->oid_kind & CTLTYPE) { 976 case CTLTYPE_NODE: 977 printf(" Node\n"); 978 if (!oidp->oid_handler) { 979 sysctl_sysctl_debug_dump_node( 980 SYSCTL_CHILDREN(oidp), i + 2); 981 } 982 break; 983 case CTLTYPE_INT: printf(" Int\n"); break; 984 case CTLTYPE_UINT: printf(" u_int\n"); break; 985 case CTLTYPE_LONG: printf(" Long\n"); break; 986 case CTLTYPE_ULONG: printf(" u_long\n"); break; 987 case CTLTYPE_STRING: printf(" String\n"); break; 988 case CTLTYPE_S8: printf(" int8_t\n"); break; 989 case CTLTYPE_S16: printf(" int16_t\n"); break; 990 case CTLTYPE_S32: printf(" int32_t\n"); break; 991 case CTLTYPE_S64: printf(" int64_t\n"); break; 992 case CTLTYPE_U8: printf(" uint8_t\n"); break; 993 case CTLTYPE_U16: printf(" uint16_t\n"); break; 994 case CTLTYPE_U32: printf(" uint32_t\n"); break; 995 case CTLTYPE_U64: printf(" uint64_t\n"); break; 996 case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 997 default: printf("\n"); 998 } 999 1000 } 1001 } 1002 1003 static int 1004 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 1005 { 1006 struct rm_priotracker tracker; 1007 int error; 1008 1009 error = priv_check(req->td, PRIV_SYSCTL_DEBUG); 1010 if (error) 1011 return (error); 1012 SYSCTL_RLOCK(&tracker); 1013 sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 1014 SYSCTL_RUNLOCK(&tracker); 1015 return (ENOENT); 1016 } 1017 1018 SYSCTL_PROC(_sysctl, CTL_SYSCTL_DEBUG, debug, CTLTYPE_STRING | CTLFLAG_RD | 1019 CTLFLAG_MPSAFE, 0, 0, sysctl_sysctl_debug, "-", ""); 1020 #endif 1021 1022 static int 1023 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 1024 { 1025 int *name = (int *) arg1; 1026 u_int namelen = arg2; 1027 int error; 1028 struct sysctl_oid *oid; 1029 struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 1030 struct rm_priotracker tracker; 1031 char buf[10]; 1032 1033 error = sysctl_wire_old_buffer(req, 0); 1034 if (error) 1035 return (error); 1036 1037 SYSCTL_RLOCK(&tracker); 1038 while (namelen) { 1039 if (!lsp) { 1040 snprintf(buf,sizeof(buf),"%d",*name); 1041 if (req->oldidx) 1042 error = SYSCTL_OUT(req, ".", 1); 1043 if (!error) 1044 error = SYSCTL_OUT(req, buf, strlen(buf)); 1045 if (error) 1046 goto out; 1047 namelen--; 1048 name++; 1049 continue; 1050 } 1051 lsp2 = NULL; 1052 SLIST_FOREACH(oid, lsp, oid_link) { 1053 if (oid->oid_number != *name) 1054 continue; 1055 1056 if (req->oldidx) 1057 error = SYSCTL_OUT(req, ".", 1); 1058 if (!error) 1059 error = SYSCTL_OUT(req, oid->oid_name, 1060 strlen(oid->oid_name)); 1061 if (error) 1062 goto out; 1063 1064 namelen--; 1065 name++; 1066 1067 if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1068 break; 1069 1070 if (oid->oid_handler) 1071 break; 1072 1073 lsp2 = SYSCTL_CHILDREN(oid); 1074 break; 1075 } 1076 lsp = lsp2; 1077 } 1078 error = SYSCTL_OUT(req, "", 1); 1079 out: 1080 SYSCTL_RUNLOCK(&tracker); 1081 return (error); 1082 } 1083 1084 /* 1085 * XXXRW/JA: Shouldn't return name data for nodes that we don't permit in 1086 * capability mode. 1087 */ 1088 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NAME, name, CTLFLAG_RD | 1089 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_name, ""); 1090 1091 static int 1092 sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 1093 int *next, int *len, int level, struct sysctl_oid **oidpp) 1094 { 1095 struct sysctl_oid *oidp; 1096 1097 SYSCTL_ASSERT_LOCKED(); 1098 *len = level; 1099 SLIST_FOREACH(oidp, lsp, oid_link) { 1100 *next = oidp->oid_number; 1101 *oidpp = oidp; 1102 1103 if ((oidp->oid_kind & (CTLFLAG_SKIP | CTLFLAG_DORMANT)) != 0) 1104 continue; 1105 1106 if (!namelen) { 1107 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1108 return (0); 1109 if (oidp->oid_handler) 1110 /* We really should call the handler here...*/ 1111 return (0); 1112 lsp = SYSCTL_CHILDREN(oidp); 1113 if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 1114 len, level+1, oidpp)) 1115 return (0); 1116 goto emptynode; 1117 } 1118 1119 if (oidp->oid_number < *name) 1120 continue; 1121 1122 if (oidp->oid_number > *name) { 1123 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1124 return (0); 1125 if (oidp->oid_handler) 1126 return (0); 1127 lsp = SYSCTL_CHILDREN(oidp); 1128 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 1129 next+1, len, level+1, oidpp)) 1130 return (0); 1131 goto next; 1132 } 1133 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1134 continue; 1135 1136 if (oidp->oid_handler) 1137 continue; 1138 1139 lsp = SYSCTL_CHILDREN(oidp); 1140 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 1141 len, level+1, oidpp)) 1142 return (0); 1143 next: 1144 namelen = 1; 1145 emptynode: 1146 *len = level; 1147 } 1148 return (1); 1149 } 1150 1151 static int 1152 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 1153 { 1154 int *name = (int *) arg1; 1155 u_int namelen = arg2; 1156 int i, j, error; 1157 struct sysctl_oid *oid; 1158 struct sysctl_oid_list *lsp = &sysctl__children; 1159 struct rm_priotracker tracker; 1160 int newoid[CTL_MAXNAME]; 1161 1162 SYSCTL_RLOCK(&tracker); 1163 i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 1164 SYSCTL_RUNLOCK(&tracker); 1165 if (i) 1166 return (ENOENT); 1167 error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 1168 return (error); 1169 } 1170 1171 /* 1172 * XXXRW/JA: Shouldn't return next data for nodes that we don't permit in 1173 * capability mode. 1174 */ 1175 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NEXT, next, CTLFLAG_RD | 1176 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_next, ""); 1177 1178 static int 1179 name2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp) 1180 { 1181 struct sysctl_oid *oidp; 1182 struct sysctl_oid_list *lsp = &sysctl__children; 1183 char *p; 1184 1185 SYSCTL_ASSERT_LOCKED(); 1186 1187 for (*len = 0; *len < CTL_MAXNAME;) { 1188 p = strsep(&name, "."); 1189 1190 oidp = SLIST_FIRST(lsp); 1191 for (;; oidp = SLIST_NEXT(oidp, oid_link)) { 1192 if (oidp == NULL) 1193 return (ENOENT); 1194 if (strcmp(p, oidp->oid_name) == 0) 1195 break; 1196 } 1197 *oid++ = oidp->oid_number; 1198 (*len)++; 1199 1200 if (name == NULL || *name == '\0') { 1201 if (oidpp) 1202 *oidpp = oidp; 1203 return (0); 1204 } 1205 1206 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 1207 break; 1208 1209 if (oidp->oid_handler) 1210 break; 1211 1212 lsp = SYSCTL_CHILDREN(oidp); 1213 } 1214 return (ENOENT); 1215 } 1216 1217 static int 1218 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 1219 { 1220 char *p; 1221 int error, oid[CTL_MAXNAME], len = 0; 1222 struct sysctl_oid *op = NULL; 1223 struct rm_priotracker tracker; 1224 char buf[32]; 1225 1226 if (!req->newlen) 1227 return (ENOENT); 1228 if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 1229 return (ENAMETOOLONG); 1230 1231 p = buf; 1232 if (req->newlen >= sizeof(buf)) 1233 p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 1234 1235 error = SYSCTL_IN(req, p, req->newlen); 1236 if (error) { 1237 if (p != buf) 1238 free(p, M_SYSCTL); 1239 return (error); 1240 } 1241 1242 p [req->newlen] = '\0'; 1243 1244 SYSCTL_RLOCK(&tracker); 1245 error = name2oid(p, oid, &len, &op); 1246 SYSCTL_RUNLOCK(&tracker); 1247 1248 if (p != buf) 1249 free(p, M_SYSCTL); 1250 1251 if (error) 1252 return (error); 1253 1254 error = SYSCTL_OUT(req, oid, len * sizeof *oid); 1255 return (error); 1256 } 1257 1258 /* 1259 * XXXRW/JA: Shouldn't return name2oid data for nodes that we don't permit in 1260 * capability mode. 1261 */ 1262 SYSCTL_PROC(_sysctl, CTL_SYSCTL_NAME2OID, name2oid, CTLTYPE_INT | CTLFLAG_RW | 1263 CTLFLAG_ANYBODY | CTLFLAG_MPSAFE | CTLFLAG_CAPRW, 0, 0, 1264 sysctl_sysctl_name2oid, "I", ""); 1265 1266 static int 1267 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 1268 { 1269 struct sysctl_oid *oid; 1270 struct rm_priotracker tracker; 1271 int error; 1272 1273 error = sysctl_wire_old_buffer(req, 0); 1274 if (error) 1275 return (error); 1276 1277 SYSCTL_RLOCK(&tracker); 1278 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 1279 if (error) 1280 goto out; 1281 1282 if (oid->oid_fmt == NULL) { 1283 error = ENOENT; 1284 goto out; 1285 } 1286 error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 1287 if (error) 1288 goto out; 1289 error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 1290 out: 1291 SYSCTL_RUNLOCK(&tracker); 1292 return (error); 1293 } 1294 1295 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDFMT, oidfmt, CTLFLAG_RD | 1296 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidfmt, ""); 1297 1298 static int 1299 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 1300 { 1301 struct sysctl_oid *oid; 1302 struct rm_priotracker tracker; 1303 int error; 1304 1305 error = sysctl_wire_old_buffer(req, 0); 1306 if (error) 1307 return (error); 1308 1309 SYSCTL_RLOCK(&tracker); 1310 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 1311 if (error) 1312 goto out; 1313 1314 if (oid->oid_descr == NULL) { 1315 error = ENOENT; 1316 goto out; 1317 } 1318 error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1); 1319 out: 1320 SYSCTL_RUNLOCK(&tracker); 1321 return (error); 1322 } 1323 1324 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDDESCR, oiddescr, CTLFLAG_RD | 1325 CTLFLAG_MPSAFE|CTLFLAG_CAPRD, sysctl_sysctl_oiddescr, ""); 1326 1327 static int 1328 sysctl_sysctl_oidlabel(SYSCTL_HANDLER_ARGS) 1329 { 1330 struct sysctl_oid *oid; 1331 struct rm_priotracker tracker; 1332 int error; 1333 1334 error = sysctl_wire_old_buffer(req, 0); 1335 if (error) 1336 return (error); 1337 1338 SYSCTL_RLOCK(&tracker); 1339 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 1340 if (error) 1341 goto out; 1342 1343 if (oid->oid_label == NULL) { 1344 error = ENOENT; 1345 goto out; 1346 } 1347 error = SYSCTL_OUT(req, oid->oid_label, strlen(oid->oid_label) + 1); 1348 out: 1349 SYSCTL_RUNLOCK(&tracker); 1350 return (error); 1351 } 1352 1353 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDLABEL, oidlabel, CTLFLAG_RD | 1354 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidlabel, ""); 1355 1356 /* 1357 * Default "handler" functions. 1358 */ 1359 1360 /* 1361 * Handle a bool. 1362 * Two cases: 1363 * a variable: point arg1 at it. 1364 * a constant: pass it in arg2. 1365 */ 1366 1367 int 1368 sysctl_handle_bool(SYSCTL_HANDLER_ARGS) 1369 { 1370 uint8_t temp; 1371 int error; 1372 1373 /* 1374 * Attempt to get a coherent snapshot by making a copy of the data. 1375 */ 1376 if (arg1) 1377 temp = *(bool *)arg1 ? 1 : 0; 1378 else 1379 temp = arg2 ? 1 : 0; 1380 1381 error = SYSCTL_OUT(req, &temp, sizeof(temp)); 1382 if (error || !req->newptr) 1383 return (error); 1384 1385 if (!arg1) 1386 error = EPERM; 1387 else { 1388 error = SYSCTL_IN(req, &temp, sizeof(temp)); 1389 if (!error) 1390 *(bool *)arg1 = temp ? 1 : 0; 1391 } 1392 return (error); 1393 } 1394 1395 /* 1396 * Handle an int8_t, signed or unsigned. 1397 * Two cases: 1398 * a variable: point arg1 at it. 1399 * a constant: pass it in arg2. 1400 */ 1401 1402 int 1403 sysctl_handle_8(SYSCTL_HANDLER_ARGS) 1404 { 1405 int8_t tmpout; 1406 int error = 0; 1407 1408 /* 1409 * Attempt to get a coherent snapshot by making a copy of the data. 1410 */ 1411 if (arg1) 1412 tmpout = *(int8_t *)arg1; 1413 else 1414 tmpout = arg2; 1415 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout)); 1416 1417 if (error || !req->newptr) 1418 return (error); 1419 1420 if (!arg1) 1421 error = EPERM; 1422 else 1423 error = SYSCTL_IN(req, arg1, sizeof(tmpout)); 1424 return (error); 1425 } 1426 1427 /* 1428 * Handle an int16_t, signed or unsigned. 1429 * Two cases: 1430 * a variable: point arg1 at it. 1431 * a constant: pass it in arg2. 1432 */ 1433 1434 int 1435 sysctl_handle_16(SYSCTL_HANDLER_ARGS) 1436 { 1437 int16_t tmpout; 1438 int error = 0; 1439 1440 /* 1441 * Attempt to get a coherent snapshot by making a copy of the data. 1442 */ 1443 if (arg1) 1444 tmpout = *(int16_t *)arg1; 1445 else 1446 tmpout = arg2; 1447 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout)); 1448 1449 if (error || !req->newptr) 1450 return (error); 1451 1452 if (!arg1) 1453 error = EPERM; 1454 else 1455 error = SYSCTL_IN(req, arg1, sizeof(tmpout)); 1456 return (error); 1457 } 1458 1459 /* 1460 * Handle an int32_t, signed or unsigned. 1461 * Two cases: 1462 * a variable: point arg1 at it. 1463 * a constant: pass it in arg2. 1464 */ 1465 1466 int 1467 sysctl_handle_32(SYSCTL_HANDLER_ARGS) 1468 { 1469 int32_t tmpout; 1470 int error = 0; 1471 1472 /* 1473 * Attempt to get a coherent snapshot by making a copy of the data. 1474 */ 1475 if (arg1) 1476 tmpout = *(int32_t *)arg1; 1477 else 1478 tmpout = arg2; 1479 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout)); 1480 1481 if (error || !req->newptr) 1482 return (error); 1483 1484 if (!arg1) 1485 error = EPERM; 1486 else 1487 error = SYSCTL_IN(req, arg1, sizeof(tmpout)); 1488 return (error); 1489 } 1490 1491 /* 1492 * Handle an int, signed or unsigned. 1493 * Two cases: 1494 * a variable: point arg1 at it. 1495 * a constant: pass it in arg2. 1496 */ 1497 1498 int 1499 sysctl_handle_int(SYSCTL_HANDLER_ARGS) 1500 { 1501 int tmpout, error = 0; 1502 1503 /* 1504 * Attempt to get a coherent snapshot by making a copy of the data. 1505 */ 1506 if (arg1) 1507 tmpout = *(int *)arg1; 1508 else 1509 tmpout = arg2; 1510 error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 1511 1512 if (error || !req->newptr) 1513 return (error); 1514 1515 if (!arg1) 1516 error = EPERM; 1517 else 1518 error = SYSCTL_IN(req, arg1, sizeof(int)); 1519 return (error); 1520 } 1521 1522 /* 1523 * Based on on sysctl_handle_int() convert milliseconds into ticks. 1524 * Note: this is used by TCP. 1525 */ 1526 1527 int 1528 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS) 1529 { 1530 int error, s, tt; 1531 1532 tt = *(int *)arg1; 1533 s = (int)((int64_t)tt * 1000 / hz); 1534 1535 error = sysctl_handle_int(oidp, &s, 0, req); 1536 if (error || !req->newptr) 1537 return (error); 1538 1539 tt = (int)((int64_t)s * hz / 1000); 1540 if (tt < 1) 1541 return (EINVAL); 1542 1543 *(int *)arg1 = tt; 1544 return (0); 1545 } 1546 1547 /* 1548 * Handle a long, signed or unsigned. 1549 * Two cases: 1550 * a variable: point arg1 at it. 1551 * a constant: pass it in arg2. 1552 */ 1553 1554 int 1555 sysctl_handle_long(SYSCTL_HANDLER_ARGS) 1556 { 1557 int error = 0; 1558 long tmplong; 1559 #ifdef SCTL_MASK32 1560 int tmpint; 1561 #endif 1562 1563 /* 1564 * Attempt to get a coherent snapshot by making a copy of the data. 1565 */ 1566 if (arg1) 1567 tmplong = *(long *)arg1; 1568 else 1569 tmplong = arg2; 1570 #ifdef SCTL_MASK32 1571 if (req->flags & SCTL_MASK32) { 1572 tmpint = tmplong; 1573 error = SYSCTL_OUT(req, &tmpint, sizeof(int)); 1574 } else 1575 #endif 1576 error = SYSCTL_OUT(req, &tmplong, sizeof(long)); 1577 1578 if (error || !req->newptr) 1579 return (error); 1580 1581 if (!arg1) 1582 error = EPERM; 1583 #ifdef SCTL_MASK32 1584 else if (req->flags & SCTL_MASK32) { 1585 error = SYSCTL_IN(req, &tmpint, sizeof(int)); 1586 *(long *)arg1 = (long)tmpint; 1587 } 1588 #endif 1589 else 1590 error = SYSCTL_IN(req, arg1, sizeof(long)); 1591 return (error); 1592 } 1593 1594 /* 1595 * Handle a 64 bit int, signed or unsigned. 1596 * Two cases: 1597 * a variable: point arg1 at it. 1598 * a constant: pass it in arg2. 1599 */ 1600 int 1601 sysctl_handle_64(SYSCTL_HANDLER_ARGS) 1602 { 1603 int error = 0; 1604 uint64_t tmpout; 1605 1606 /* 1607 * Attempt to get a coherent snapshot by making a copy of the data. 1608 */ 1609 if (arg1) 1610 tmpout = *(uint64_t *)arg1; 1611 else 1612 tmpout = arg2; 1613 error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t)); 1614 1615 if (error || !req->newptr) 1616 return (error); 1617 1618 if (!arg1) 1619 error = EPERM; 1620 else 1621 error = SYSCTL_IN(req, arg1, sizeof(uint64_t)); 1622 return (error); 1623 } 1624 1625 /* 1626 * Handle our generic '\0' terminated 'C' string. 1627 * Two cases: 1628 * a variable string: point arg1 at it, arg2 is max length. 1629 * a constant string: point arg1 at it, arg2 is zero. 1630 */ 1631 1632 int 1633 sysctl_handle_string(SYSCTL_HANDLER_ARGS) 1634 { 1635 size_t outlen; 1636 int error = 0, ro_string = 0; 1637 1638 /* 1639 * A zero-length buffer indicates a fixed size read-only 1640 * string. In ddb, don't worry about trying to make a malloced 1641 * snapshot. 1642 */ 1643 if (arg2 == 0 || kdb_active) { 1644 arg2 = strlen((char *)arg1) + 1; 1645 ro_string = 1; 1646 } 1647 1648 if (req->oldptr != NULL) { 1649 char *tmparg; 1650 1651 if (ro_string) { 1652 tmparg = arg1; 1653 } else { 1654 /* try to make a coherent snapshot of the string */ 1655 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK); 1656 memcpy(tmparg, arg1, arg2); 1657 } 1658 1659 outlen = strnlen(tmparg, arg2 - 1) + 1; 1660 error = SYSCTL_OUT(req, tmparg, outlen); 1661 1662 if (!ro_string) 1663 free(tmparg, M_SYSCTLTMP); 1664 } else { 1665 outlen = strnlen((char *)arg1, arg2 - 1) + 1; 1666 error = SYSCTL_OUT(req, NULL, outlen); 1667 } 1668 if (error || !req->newptr) 1669 return (error); 1670 1671 if ((req->newlen - req->newidx) >= arg2) { 1672 error = EINVAL; 1673 } else { 1674 arg2 = (req->newlen - req->newidx); 1675 error = SYSCTL_IN(req, arg1, arg2); 1676 ((char *)arg1)[arg2] = '\0'; 1677 } 1678 return (error); 1679 } 1680 1681 /* 1682 * Handle any kind of opaque data. 1683 * arg1 points to it, arg2 is the size. 1684 */ 1685 1686 int 1687 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 1688 { 1689 int error, tries; 1690 u_int generation; 1691 struct sysctl_req req2; 1692 1693 /* 1694 * Attempt to get a coherent snapshot, by using the thread 1695 * pre-emption counter updated from within mi_switch() to 1696 * determine if we were pre-empted during a bcopy() or 1697 * copyout(). Make 3 attempts at doing this before giving up. 1698 * If we encounter an error, stop immediately. 1699 */ 1700 tries = 0; 1701 req2 = *req; 1702 retry: 1703 generation = curthread->td_generation; 1704 error = SYSCTL_OUT(req, arg1, arg2); 1705 if (error) 1706 return (error); 1707 tries++; 1708 if (generation != curthread->td_generation && tries < 3) { 1709 *req = req2; 1710 goto retry; 1711 } 1712 1713 error = SYSCTL_IN(req, arg1, arg2); 1714 1715 return (error); 1716 } 1717 1718 /* 1719 * Based on on sysctl_handle_int() convert microseconds to a sbintime. 1720 */ 1721 int 1722 sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS) 1723 { 1724 int error; 1725 int64_t tt; 1726 sbintime_t sb; 1727 1728 tt = *(int64_t *)arg1; 1729 sb = sbttous(tt); 1730 1731 error = sysctl_handle_64(oidp, &sb, 0, req); 1732 if (error || !req->newptr) 1733 return (error); 1734 1735 tt = ustosbt(sb); 1736 *(int64_t *)arg1 = tt; 1737 1738 return (0); 1739 } 1740 1741 /* 1742 * Based on on sysctl_handle_int() convert milliseconds to a sbintime. 1743 */ 1744 int 1745 sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS) 1746 { 1747 int error; 1748 int64_t tt; 1749 sbintime_t sb; 1750 1751 tt = *(int64_t *)arg1; 1752 sb = sbttoms(tt); 1753 1754 error = sysctl_handle_64(oidp, &sb, 0, req); 1755 if (error || !req->newptr) 1756 return (error); 1757 1758 tt = mstosbt(sb); 1759 *(int64_t *)arg1 = tt; 1760 1761 return (0); 1762 } 1763 1764 /* 1765 * Convert seconds to a struct timeval. Intended for use with 1766 * intervals and thus does not permit negative seconds. 1767 */ 1768 int 1769 sysctl_sec_to_timeval(SYSCTL_HANDLER_ARGS) 1770 { 1771 struct timeval *tv; 1772 int error, secs; 1773 1774 tv = arg1; 1775 secs = tv->tv_sec; 1776 1777 error = sysctl_handle_int(oidp, &secs, 0, req); 1778 if (error || req->newptr == NULL) 1779 return (error); 1780 1781 if (secs < 0) 1782 return (EINVAL); 1783 tv->tv_sec = secs; 1784 1785 return (0); 1786 } 1787 1788 /* 1789 * Transfer functions to/from kernel space. 1790 * XXX: rather untested at this point 1791 */ 1792 static int 1793 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 1794 { 1795 size_t i = 0; 1796 1797 if (req->oldptr) { 1798 i = l; 1799 if (req->oldlen <= req->oldidx) 1800 i = 0; 1801 else 1802 if (i > req->oldlen - req->oldidx) 1803 i = req->oldlen - req->oldidx; 1804 if (i > 0) 1805 bcopy(p, (char *)req->oldptr + req->oldidx, i); 1806 } 1807 req->oldidx += l; 1808 if (req->oldptr && i != l) 1809 return (ENOMEM); 1810 return (0); 1811 } 1812 1813 static int 1814 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 1815 { 1816 if (!req->newptr) 1817 return (0); 1818 if (req->newlen - req->newidx < l) 1819 return (EINVAL); 1820 bcopy((const char *)req->newptr + req->newidx, p, l); 1821 req->newidx += l; 1822 return (0); 1823 } 1824 1825 int 1826 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1827 size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags) 1828 { 1829 int error = 0; 1830 struct sysctl_req req; 1831 1832 bzero(&req, sizeof req); 1833 1834 req.td = td; 1835 req.flags = flags; 1836 1837 if (oldlenp) { 1838 req.oldlen = *oldlenp; 1839 } 1840 req.validlen = req.oldlen; 1841 1842 if (old) { 1843 req.oldptr= old; 1844 } 1845 1846 if (new != NULL) { 1847 req.newlen = newlen; 1848 req.newptr = new; 1849 } 1850 1851 req.oldfunc = sysctl_old_kernel; 1852 req.newfunc = sysctl_new_kernel; 1853 req.lock = REQ_UNWIRED; 1854 1855 error = sysctl_root(0, name, namelen, &req); 1856 1857 if (req.lock == REQ_WIRED && req.validlen > 0) 1858 vsunlock(req.oldptr, req.validlen); 1859 1860 if (error && error != ENOMEM) 1861 return (error); 1862 1863 if (retval) { 1864 if (req.oldptr && req.oldidx > req.validlen) 1865 *retval = req.validlen; 1866 else 1867 *retval = req.oldidx; 1868 } 1869 return (error); 1870 } 1871 1872 int 1873 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 1874 void *new, size_t newlen, size_t *retval, int flags) 1875 { 1876 int oid[CTL_MAXNAME]; 1877 size_t oidlen, plen; 1878 int error; 1879 1880 oid[0] = CTL_SYSCTL; 1881 oid[1] = CTL_SYSCTL_NAME2OID; 1882 oidlen = sizeof(oid); 1883 1884 error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1885 (void *)name, strlen(name), &plen, flags); 1886 if (error) 1887 return (error); 1888 1889 error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1890 new, newlen, retval, flags); 1891 return (error); 1892 } 1893 1894 /* 1895 * Transfer function to/from user space. 1896 */ 1897 static int 1898 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 1899 { 1900 size_t i, len, origidx; 1901 int error; 1902 1903 origidx = req->oldidx; 1904 req->oldidx += l; 1905 if (req->oldptr == NULL) 1906 return (0); 1907 /* 1908 * If we have not wired the user supplied buffer and we are currently 1909 * holding locks, drop a witness warning, as it's possible that 1910 * write operations to the user page can sleep. 1911 */ 1912 if (req->lock != REQ_WIRED) 1913 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1914 "sysctl_old_user()"); 1915 i = l; 1916 len = req->validlen; 1917 if (len <= origidx) 1918 i = 0; 1919 else { 1920 if (i > len - origidx) 1921 i = len - origidx; 1922 if (req->lock == REQ_WIRED) { 1923 error = copyout_nofault(p, (char *)req->oldptr + 1924 origidx, i); 1925 } else 1926 error = copyout(p, (char *)req->oldptr + origidx, i); 1927 if (error != 0) 1928 return (error); 1929 } 1930 if (i < l) 1931 return (ENOMEM); 1932 return (0); 1933 } 1934 1935 static int 1936 sysctl_new_user(struct sysctl_req *req, void *p, size_t l) 1937 { 1938 int error; 1939 1940 if (!req->newptr) 1941 return (0); 1942 if (req->newlen - req->newidx < l) 1943 return (EINVAL); 1944 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1945 "sysctl_new_user()"); 1946 error = copyin((const char *)req->newptr + req->newidx, p, l); 1947 req->newidx += l; 1948 return (error); 1949 } 1950 1951 /* 1952 * Wire the user space destination buffer. If set to a value greater than 1953 * zero, the len parameter limits the maximum amount of wired memory. 1954 */ 1955 int 1956 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1957 { 1958 int ret; 1959 size_t wiredlen; 1960 1961 wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen; 1962 ret = 0; 1963 if (req->lock != REQ_WIRED && req->oldptr && 1964 req->oldfunc == sysctl_old_user) { 1965 if (wiredlen != 0) { 1966 ret = vslock(req->oldptr, wiredlen); 1967 if (ret != 0) { 1968 if (ret != ENOMEM) 1969 return (ret); 1970 wiredlen = 0; 1971 } 1972 } 1973 req->lock = REQ_WIRED; 1974 req->validlen = wiredlen; 1975 } 1976 return (0); 1977 } 1978 1979 int 1980 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 1981 int *nindx, struct sysctl_req *req) 1982 { 1983 struct sysctl_oid_list *lsp; 1984 struct sysctl_oid *oid; 1985 int indx; 1986 1987 SYSCTL_ASSERT_LOCKED(); 1988 lsp = &sysctl__children; 1989 indx = 0; 1990 while (indx < CTL_MAXNAME) { 1991 SLIST_FOREACH(oid, lsp, oid_link) { 1992 if (oid->oid_number == name[indx]) 1993 break; 1994 } 1995 if (oid == NULL) 1996 return (ENOENT); 1997 1998 indx++; 1999 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2000 if (oid->oid_handler != NULL || indx == namelen) { 2001 *noid = oid; 2002 if (nindx != NULL) 2003 *nindx = indx; 2004 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 2005 ("%s found DYING node %p", __func__, oid)); 2006 return (0); 2007 } 2008 lsp = SYSCTL_CHILDREN(oid); 2009 } else if (indx == namelen) { 2010 if ((oid->oid_kind & CTLFLAG_DORMANT) != 0) 2011 return (ENOENT); 2012 *noid = oid; 2013 if (nindx != NULL) 2014 *nindx = indx; 2015 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 2016 ("%s found DYING node %p", __func__, oid)); 2017 return (0); 2018 } else { 2019 return (ENOTDIR); 2020 } 2021 } 2022 return (ENOENT); 2023 } 2024 2025 /* 2026 * Traverse our tree, and find the right node, execute whatever it points 2027 * to, and return the resulting error code. 2028 */ 2029 2030 static int 2031 sysctl_root(SYSCTL_HANDLER_ARGS) 2032 { 2033 struct sysctl_oid *oid; 2034 struct rm_priotracker tracker; 2035 int error, indx, lvl; 2036 2037 SYSCTL_RLOCK(&tracker); 2038 2039 error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 2040 if (error) 2041 goto out; 2042 2043 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2044 /* 2045 * You can't call a sysctl when it's a node, but has 2046 * no handler. Inform the user that it's a node. 2047 * The indx may or may not be the same as namelen. 2048 */ 2049 if (oid->oid_handler == NULL) { 2050 error = EISDIR; 2051 goto out; 2052 } 2053 } 2054 2055 /* Is this sysctl writable? */ 2056 if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) { 2057 error = EPERM; 2058 goto out; 2059 } 2060 2061 KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 2062 2063 #ifdef CAPABILITY_MODE 2064 /* 2065 * If the process is in capability mode, then don't permit reading or 2066 * writing unless specifically granted for the node. 2067 */ 2068 if (IN_CAPABILITY_MODE(req->td)) { 2069 if ((req->oldptr && !(oid->oid_kind & CTLFLAG_CAPRD)) || 2070 (req->newptr && !(oid->oid_kind & CTLFLAG_CAPWR))) { 2071 error = EPERM; 2072 goto out; 2073 } 2074 } 2075 #endif 2076 2077 /* Is this sysctl sensitive to securelevels? */ 2078 if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 2079 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 2080 error = securelevel_gt(req->td->td_ucred, lvl); 2081 if (error) 2082 goto out; 2083 } 2084 2085 /* Is this sysctl writable by only privileged users? */ 2086 if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 2087 int priv; 2088 2089 if (oid->oid_kind & CTLFLAG_PRISON) 2090 priv = PRIV_SYSCTL_WRITEJAIL; 2091 #ifdef VIMAGE 2092 else if ((oid->oid_kind & CTLFLAG_VNET) && 2093 prison_owns_vnet(req->td->td_ucred)) 2094 priv = PRIV_SYSCTL_WRITEJAIL; 2095 #endif 2096 else 2097 priv = PRIV_SYSCTL_WRITE; 2098 error = priv_check(req->td, priv); 2099 if (error) 2100 goto out; 2101 } 2102 2103 if (!oid->oid_handler) { 2104 error = EINVAL; 2105 goto out; 2106 } 2107 2108 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2109 arg1 = (int *)arg1 + indx; 2110 arg2 -= indx; 2111 } else { 2112 arg1 = oid->oid_arg1; 2113 arg2 = oid->oid_arg2; 2114 } 2115 #ifdef MAC 2116 error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2, 2117 req); 2118 if (error != 0) 2119 goto out; 2120 #endif 2121 #ifdef VIMAGE 2122 if ((oid->oid_kind & CTLFLAG_VNET) && arg1 != NULL) 2123 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1); 2124 #endif 2125 error = sysctl_root_handler_locked(oid, arg1, arg2, req, &tracker); 2126 2127 out: 2128 SYSCTL_RUNLOCK(&tracker); 2129 return (error); 2130 } 2131 2132 #ifndef _SYS_SYSPROTO_H_ 2133 struct sysctl_args { 2134 int *name; 2135 u_int namelen; 2136 void *old; 2137 size_t *oldlenp; 2138 void *new; 2139 size_t newlen; 2140 }; 2141 #endif 2142 int 2143 sys___sysctl(struct thread *td, struct sysctl_args *uap) 2144 { 2145 int error, i, name[CTL_MAXNAME]; 2146 size_t j; 2147 2148 if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 2149 return (EINVAL); 2150 2151 error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 2152 if (error) 2153 return (error); 2154 2155 error = userland_sysctl(td, name, uap->namelen, 2156 uap->old, uap->oldlenp, 0, 2157 uap->new, uap->newlen, &j, 0); 2158 if (error && error != ENOMEM) 2159 return (error); 2160 if (uap->oldlenp) { 2161 i = copyout(&j, uap->oldlenp, sizeof(j)); 2162 if (i) 2163 return (i); 2164 } 2165 return (error); 2166 } 2167 2168 int 2169 kern___sysctlbyname(struct thread *td, const char *oname, size_t namelen, 2170 void *old, size_t *oldlenp, void *new, size_t newlen, size_t *retval, 2171 int flags, bool inkernel) 2172 { 2173 int oid[CTL_MAXNAME]; 2174 char namebuf[16]; 2175 char *name; 2176 size_t oidlen; 2177 int error; 2178 2179 if (namelen > MAXPATHLEN || namelen == 0) 2180 return (EINVAL); 2181 name = namebuf; 2182 if (namelen > sizeof(namebuf)) 2183 name = malloc(namelen, M_SYSCTL, M_WAITOK); 2184 error = copyin(oname, name, namelen); 2185 if (error != 0) 2186 goto out; 2187 2188 oid[0] = CTL_SYSCTL; 2189 oid[1] = CTL_SYSCTL_NAME2OID; 2190 oidlen = sizeof(oid); 2191 error = kernel_sysctl(td, oid, 2, oid, &oidlen, (void *)name, namelen, 2192 retval, flags); 2193 if (error != 0) 2194 goto out; 2195 error = userland_sysctl(td, oid, *retval / sizeof(int), old, oldlenp, 2196 inkernel, new, newlen, retval, flags); 2197 2198 out: 2199 if (namelen > sizeof(namebuf)) 2200 free(name, M_SYSCTL); 2201 return (error); 2202 } 2203 2204 #ifndef _SYS_SYSPROTO_H_ 2205 struct __sysctlbyname_args { 2206 const char *name; 2207 size_t namelen; 2208 void *old; 2209 size_t *oldlenp; 2210 void *new; 2211 size_t newlen; 2212 }; 2213 #endif 2214 int 2215 sys___sysctlbyname(struct thread *td, struct __sysctlbyname_args *uap) 2216 { 2217 size_t rv; 2218 int error; 2219 2220 error = kern___sysctlbyname(td, uap->name, uap->namelen, uap->old, 2221 uap->oldlenp, uap->new, uap->newlen, &rv, 0, 0); 2222 if (error != 0) 2223 return (error); 2224 if (uap->oldlenp != NULL) 2225 error = copyout(&rv, uap->oldlenp, sizeof(rv)); 2226 2227 return (error); 2228 } 2229 2230 /* 2231 * This is used from various compatibility syscalls too. That's why name 2232 * must be in kernel space. 2233 */ 2234 int 2235 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 2236 size_t *oldlenp, int inkernel, const void *new, size_t newlen, 2237 size_t *retval, int flags) 2238 { 2239 int error = 0, memlocked; 2240 struct sysctl_req req; 2241 2242 bzero(&req, sizeof req); 2243 2244 req.td = td; 2245 req.flags = flags; 2246 2247 if (oldlenp) { 2248 if (inkernel) { 2249 req.oldlen = *oldlenp; 2250 } else { 2251 error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 2252 if (error) 2253 return (error); 2254 } 2255 } 2256 req.validlen = req.oldlen; 2257 req.oldptr = old; 2258 2259 if (new != NULL) { 2260 req.newlen = newlen; 2261 req.newptr = new; 2262 } 2263 2264 req.oldfunc = sysctl_old_user; 2265 req.newfunc = sysctl_new_user; 2266 req.lock = REQ_UNWIRED; 2267 2268 #ifdef KTRACE 2269 if (KTRPOINT(curthread, KTR_SYSCTL)) 2270 ktrsysctl(name, namelen); 2271 #endif 2272 memlocked = 0; 2273 if (req.oldptr && req.oldlen > 4 * PAGE_SIZE) { 2274 memlocked = 1; 2275 sx_xlock(&sysctlmemlock); 2276 } 2277 CURVNET_SET(TD_TO_VNET(td)); 2278 2279 for (;;) { 2280 req.oldidx = 0; 2281 req.newidx = 0; 2282 error = sysctl_root(0, name, namelen, &req); 2283 if (error != EAGAIN) 2284 break; 2285 kern_yield(PRI_USER); 2286 } 2287 2288 CURVNET_RESTORE(); 2289 2290 if (req.lock == REQ_WIRED && req.validlen > 0) 2291 vsunlock(req.oldptr, req.validlen); 2292 if (memlocked) 2293 sx_xunlock(&sysctlmemlock); 2294 2295 if (error && error != ENOMEM) 2296 return (error); 2297 2298 if (retval) { 2299 if (req.oldptr && req.oldidx > req.validlen) 2300 *retval = req.validlen; 2301 else 2302 *retval = req.oldidx; 2303 } 2304 return (error); 2305 } 2306 2307 /* 2308 * Drain into a sysctl struct. The user buffer should be wired if a page 2309 * fault would cause issue. 2310 */ 2311 static int 2312 sbuf_sysctl_drain(void *arg, const char *data, int len) 2313 { 2314 struct sysctl_req *req = arg; 2315 int error; 2316 2317 error = SYSCTL_OUT(req, data, len); 2318 KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 2319 return (error == 0 ? len : -error); 2320 } 2321 2322 struct sbuf * 2323 sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 2324 struct sysctl_req *req) 2325 { 2326 2327 /* Supply a default buffer size if none given. */ 2328 if (buf == NULL && length == 0) 2329 length = 64; 2330 s = sbuf_new(s, buf, length, SBUF_FIXEDLEN | SBUF_INCLUDENUL); 2331 sbuf_set_drain(s, sbuf_sysctl_drain, req); 2332 return (s); 2333 } 2334 2335 #ifdef DDB 2336 2337 /* The current OID the debugger is working with */ 2338 static struct sysctl_oid *g_ddb_oid; 2339 2340 /* The current flags specified by the user */ 2341 static int g_ddb_sysctl_flags; 2342 2343 /* Check to see if the last sysctl printed */ 2344 static int g_ddb_sysctl_printed; 2345 2346 static const int ctl_sign[CTLTYPE+1] = { 2347 [CTLTYPE_INT] = 1, 2348 [CTLTYPE_LONG] = 1, 2349 [CTLTYPE_S8] = 1, 2350 [CTLTYPE_S16] = 1, 2351 [CTLTYPE_S32] = 1, 2352 [CTLTYPE_S64] = 1, 2353 }; 2354 2355 static const int ctl_size[CTLTYPE+1] = { 2356 [CTLTYPE_INT] = sizeof(int), 2357 [CTLTYPE_UINT] = sizeof(u_int), 2358 [CTLTYPE_LONG] = sizeof(long), 2359 [CTLTYPE_ULONG] = sizeof(u_long), 2360 [CTLTYPE_S8] = sizeof(int8_t), 2361 [CTLTYPE_S16] = sizeof(int16_t), 2362 [CTLTYPE_S32] = sizeof(int32_t), 2363 [CTLTYPE_S64] = sizeof(int64_t), 2364 [CTLTYPE_U8] = sizeof(uint8_t), 2365 [CTLTYPE_U16] = sizeof(uint16_t), 2366 [CTLTYPE_U32] = sizeof(uint32_t), 2367 [CTLTYPE_U64] = sizeof(uint64_t), 2368 }; 2369 2370 #define DB_SYSCTL_NAME_ONLY 0x001 /* Compare with -N */ 2371 #define DB_SYSCTL_VALUE_ONLY 0x002 /* Compare with -n */ 2372 #define DB_SYSCTL_OPAQUE 0x004 /* Compare with -o */ 2373 #define DB_SYSCTL_HEX 0x008 /* Compare with -x */ 2374 2375 #define DB_SYSCTL_SAFE_ONLY 0x100 /* Only simple types */ 2376 2377 static const char db_sysctl_modifs[] = { 2378 'N', 'n', 'o', 'x', 2379 }; 2380 2381 static const int db_sysctl_modif_values[] = { 2382 DB_SYSCTL_NAME_ONLY, DB_SYSCTL_VALUE_ONLY, 2383 DB_SYSCTL_OPAQUE, DB_SYSCTL_HEX, 2384 }; 2385 2386 /* Handlers considered safe to print while recursing */ 2387 static int (* const db_safe_handlers[])(SYSCTL_HANDLER_ARGS) = { 2388 sysctl_handle_bool, 2389 sysctl_handle_8, 2390 sysctl_handle_16, 2391 sysctl_handle_32, 2392 sysctl_handle_64, 2393 sysctl_handle_int, 2394 sysctl_handle_long, 2395 sysctl_handle_string, 2396 sysctl_handle_opaque, 2397 }; 2398 2399 /* 2400 * Use in place of sysctl_old_kernel to print sysctl values. 2401 * 2402 * Compare to the output handling in show_var from sbin/sysctl/sysctl.c 2403 */ 2404 static int 2405 sysctl_old_ddb(struct sysctl_req *req, const void *ptr, size_t len) 2406 { 2407 const u_char *val, *p; 2408 const char *sep1; 2409 size_t intlen, slen; 2410 uintmax_t umv; 2411 intmax_t mv; 2412 int sign, ctltype, hexlen, xflag, error; 2413 2414 /* Suppress false-positive GCC uninitialized variable warnings */ 2415 mv = 0; 2416 umv = 0; 2417 2418 slen = len; 2419 val = p = ptr; 2420 2421 if (ptr == NULL) { 2422 error = 0; 2423 goto out; 2424 } 2425 2426 /* We are going to print */ 2427 g_ddb_sysctl_printed = 1; 2428 2429 xflag = g_ddb_sysctl_flags & DB_SYSCTL_HEX; 2430 2431 ctltype = (g_ddb_oid->oid_kind & CTLTYPE); 2432 sign = ctl_sign[ctltype]; 2433 intlen = ctl_size[ctltype]; 2434 2435 switch (ctltype) { 2436 case CTLTYPE_NODE: 2437 case CTLTYPE_STRING: 2438 db_printf("%.*s", (int) len, (const char *) p); 2439 error = 0; 2440 goto out; 2441 2442 case CTLTYPE_INT: 2443 case CTLTYPE_UINT: 2444 case CTLTYPE_LONG: 2445 case CTLTYPE_ULONG: 2446 case CTLTYPE_S8: 2447 case CTLTYPE_S16: 2448 case CTLTYPE_S32: 2449 case CTLTYPE_S64: 2450 case CTLTYPE_U8: 2451 case CTLTYPE_U16: 2452 case CTLTYPE_U32: 2453 case CTLTYPE_U64: 2454 hexlen = 2 + (intlen * CHAR_BIT + 3) / 4; 2455 sep1 = ""; 2456 while (len >= intlen) { 2457 switch (ctltype) { 2458 case CTLTYPE_INT: 2459 case CTLTYPE_UINT: 2460 umv = *(const u_int *)p; 2461 mv = *(const int *)p; 2462 break; 2463 case CTLTYPE_LONG: 2464 case CTLTYPE_ULONG: 2465 umv = *(const u_long *)p; 2466 mv = *(const long *)p; 2467 break; 2468 case CTLTYPE_S8: 2469 case CTLTYPE_U8: 2470 umv = *(const uint8_t *)p; 2471 mv = *(const int8_t *)p; 2472 break; 2473 case CTLTYPE_S16: 2474 case CTLTYPE_U16: 2475 umv = *(const uint16_t *)p; 2476 mv = *(const int16_t *)p; 2477 break; 2478 case CTLTYPE_S32: 2479 case CTLTYPE_U32: 2480 umv = *(const uint32_t *)p; 2481 mv = *(const int32_t *)p; 2482 break; 2483 case CTLTYPE_S64: 2484 case CTLTYPE_U64: 2485 umv = *(const uint64_t *)p; 2486 mv = *(const int64_t *)p; 2487 break; 2488 } 2489 2490 db_printf("%s", sep1); 2491 if (xflag) 2492 db_printf("%#0*jx", hexlen, umv); 2493 else if (!sign) 2494 db_printf("%ju", umv); 2495 else if (g_ddb_oid->oid_fmt[1] == 'K') { 2496 /* Kelvins are currently unsupported. */ 2497 error = EOPNOTSUPP; 2498 goto out; 2499 } else 2500 db_printf("%jd", mv); 2501 2502 sep1 = " "; 2503 len -= intlen; 2504 p += intlen; 2505 } 2506 error = 0; 2507 goto out; 2508 2509 case CTLTYPE_OPAQUE: 2510 /* TODO: Support struct functions. */ 2511 2512 /* FALLTHROUGH */ 2513 default: 2514 db_printf("Format:%s Length:%zu Dump:0x", 2515 g_ddb_oid->oid_fmt, len); 2516 while (len-- && (xflag || p < val + 16)) 2517 db_printf("%02x", *p++); 2518 if (!xflag && len > 16) 2519 db_printf("..."); 2520 error = 0; 2521 goto out; 2522 } 2523 2524 out: 2525 req->oldidx += slen; 2526 return (error); 2527 } 2528 2529 /* 2530 * Avoid setting new sysctl values from the debugger 2531 */ 2532 static int 2533 sysctl_new_ddb(struct sysctl_req *req, void *p, size_t l) 2534 { 2535 2536 if (!req->newptr) 2537 return (0); 2538 2539 /* Changing sysctls from the debugger is currently unsupported */ 2540 return (EPERM); 2541 } 2542 2543 /* 2544 * Run a sysctl handler with the DDB oldfunc and newfunc attached. 2545 * Instead of copying any output to a buffer we'll dump it right to 2546 * the console. 2547 */ 2548 static int 2549 db_sysctl(struct sysctl_oid *oidp, int *name, u_int namelen, 2550 void *old, size_t *oldlenp, size_t *retval, int flags) 2551 { 2552 struct sysctl_req req; 2553 int error; 2554 2555 /* Setup the request */ 2556 bzero(&req, sizeof req); 2557 req.td = kdb_thread; 2558 req.oldfunc = sysctl_old_ddb; 2559 req.newfunc = sysctl_new_ddb; 2560 req.lock = REQ_UNWIRED; 2561 if (oldlenp) { 2562 req.oldlen = *oldlenp; 2563 } 2564 req.validlen = req.oldlen; 2565 if (old) { 2566 req.oldptr = old; 2567 } 2568 2569 /* Setup our globals for sysctl_old_ddb */ 2570 g_ddb_oid = oidp; 2571 g_ddb_sysctl_flags = flags; 2572 g_ddb_sysctl_printed = 0; 2573 2574 error = sysctl_root(0, name, namelen, &req); 2575 2576 /* Reset globals */ 2577 g_ddb_oid = NULL; 2578 g_ddb_sysctl_flags = 0; 2579 2580 if (retval) { 2581 if (req.oldptr && req.oldidx > req.validlen) 2582 *retval = req.validlen; 2583 else 2584 *retval = req.oldidx; 2585 } 2586 return (error); 2587 } 2588 2589 /* 2590 * Show a sysctl's name 2591 */ 2592 static void 2593 db_show_oid_name(int *oid, size_t nlen) 2594 { 2595 struct sysctl_oid *oidp; 2596 int qoid[CTL_MAXNAME+2]; 2597 int error; 2598 2599 qoid[0] = 0; 2600 memcpy(qoid + 2, oid, nlen * sizeof(int)); 2601 qoid[1] = 1; 2602 2603 error = sysctl_find_oid(qoid, nlen + 2, &oidp, NULL, NULL); 2604 if (error) 2605 db_error("sysctl name oid"); 2606 2607 error = db_sysctl(oidp, qoid, nlen + 2, NULL, NULL, NULL, 0); 2608 if (error) 2609 db_error("sysctl name"); 2610 } 2611 2612 /* 2613 * Check to see if an OID is safe to print from ddb. 2614 */ 2615 static bool 2616 db_oid_safe(const struct sysctl_oid *oidp) 2617 { 2618 for (unsigned int i = 0; i < nitems(db_safe_handlers); ++i) { 2619 if (oidp->oid_handler == db_safe_handlers[i]) 2620 return (true); 2621 } 2622 2623 return (false); 2624 } 2625 2626 /* 2627 * Show a sysctl at a specific OID 2628 * Compare to the input handling in show_var from sbin/sysctl/sysctl.c 2629 */ 2630 static int 2631 db_show_oid(struct sysctl_oid *oidp, int *oid, size_t nlen, int flags) 2632 { 2633 int error, xflag, oflag, Nflag, nflag; 2634 size_t len; 2635 2636 xflag = flags & DB_SYSCTL_HEX; 2637 oflag = flags & DB_SYSCTL_OPAQUE; 2638 nflag = flags & DB_SYSCTL_VALUE_ONLY; 2639 Nflag = flags & DB_SYSCTL_NAME_ONLY; 2640 2641 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_OPAQUE && 2642 (!xflag && !oflag)) 2643 return (0); 2644 2645 if (Nflag) { 2646 db_show_oid_name(oid, nlen); 2647 error = 0; 2648 goto out; 2649 } 2650 2651 if (!nflag) { 2652 db_show_oid_name(oid, nlen); 2653 db_printf(": "); 2654 } 2655 2656 if ((flags & DB_SYSCTL_SAFE_ONLY) && !db_oid_safe(oidp)) { 2657 db_printf("Skipping, unsafe to print while recursing."); 2658 error = 0; 2659 goto out; 2660 } 2661 2662 /* Try once, and ask about the size */ 2663 len = 0; 2664 error = db_sysctl(oidp, oid, nlen, 2665 NULL, NULL, &len, flags); 2666 if (error) 2667 goto out; 2668 2669 if (!g_ddb_sysctl_printed) 2670 /* Lie about the size */ 2671 error = db_sysctl(oidp, oid, nlen, 2672 (void *) 1, &len, NULL, flags); 2673 2674 out: 2675 db_printf("\n"); 2676 return (error); 2677 } 2678 2679 /* 2680 * Show all sysctls under a specific OID 2681 * Compare to sysctl_all from sbin/sysctl/sysctl.c 2682 */ 2683 static int 2684 db_show_sysctl_all(int *oid, size_t len, int flags) 2685 { 2686 struct sysctl_oid *oidp; 2687 int name1[CTL_MAXNAME + 2], name2[CTL_MAXNAME + 2]; 2688 size_t l1, l2; 2689 2690 name1[0] = CTL_SYSCTL; 2691 name1[1] = CTL_SYSCTL_NEXT; 2692 l1 = 2; 2693 if (len) { 2694 memcpy(name1+2, oid, len * sizeof(int)); 2695 l1 +=len; 2696 } else { 2697 name1[2] = 1; 2698 l1++; 2699 } 2700 for (;;) { 2701 int i, error; 2702 2703 l2 = sizeof(name2); 2704 error = kernel_sysctl(kdb_thread, name1, l1, 2705 name2, &l2, NULL, 0, &l2, 0); 2706 if (error != 0) { 2707 if (error == ENOENT) 2708 return (0); 2709 else 2710 db_error("sysctl(getnext)"); 2711 } 2712 2713 l2 /= sizeof(int); 2714 2715 if (l2 < (unsigned int)len) 2716 return (0); 2717 2718 for (i = 0; i < len; i++) 2719 if (name2[i] != oid[i]) 2720 return (0); 2721 2722 /* Find the OID in question */ 2723 error = sysctl_find_oid(name2, l2, &oidp, NULL, NULL); 2724 if (error) 2725 return (error); 2726 2727 i = db_show_oid(oidp, name2, l2, flags | DB_SYSCTL_SAFE_ONLY); 2728 2729 if (db_pager_quit) 2730 return (0); 2731 2732 memcpy(name1+2, name2, l2 * sizeof(int)); 2733 l1 = 2 + l2; 2734 } 2735 } 2736 2737 /* 2738 * Show a sysctl by its user facing string 2739 */ 2740 static int 2741 db_sysctlbyname(char *name, int flags) 2742 { 2743 struct sysctl_oid *oidp; 2744 int oid[CTL_MAXNAME]; 2745 int error, nlen; 2746 2747 error = name2oid(name, oid, &nlen, &oidp); 2748 if (error) { 2749 return (error); 2750 } 2751 2752 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 2753 db_show_sysctl_all(oid, nlen, flags); 2754 } else { 2755 error = db_show_oid(oidp, oid, nlen, flags); 2756 } 2757 2758 return (error); 2759 } 2760 2761 static void 2762 db_sysctl_cmd_usage(void) 2763 { 2764 db_printf( 2765 " sysctl [/Nnox] <sysctl> \n" 2766 " \n" 2767 " <sysctl> The name of the sysctl to show. \n" 2768 " \n" 2769 " Show a sysctl by hooking into SYSCTL_IN and SYSCTL_OUT. \n" 2770 " This will work for most sysctls, but should not be used \n" 2771 " with sysctls that are known to malloc. \n" 2772 " \n" 2773 " While recursing any \"unsafe\" sysctls will be skipped. \n" 2774 " Call sysctl directly on the sysctl to try printing the \n" 2775 " skipped sysctl. This is unsafe and may make the ddb \n" 2776 " session unusable. \n" 2777 " \n" 2778 " Arguments: \n" 2779 " /N Display only the name of the sysctl. \n" 2780 " /n Display only the value of the sysctl. \n" 2781 " /o Display opaque values. \n" 2782 " /x Display the sysctl in hex. \n" 2783 " \n" 2784 "For example: \n" 2785 "sysctl vm.v_free_min \n" 2786 "vn.v_free_min: 12669 \n" 2787 ); 2788 } 2789 2790 /* 2791 * Show a specific sysctl similar to sysctl (8). 2792 */ 2793 DB_FUNC(sysctl, db_sysctl_cmd, db_cmd_table, CS_OWN, NULL) 2794 { 2795 char name[TOK_STRING_SIZE]; 2796 int error, i, t, flags; 2797 2798 /* Parse the modifiers */ 2799 t = db_read_token(); 2800 if (t == tSLASH || t == tMINUS) { 2801 t = db_read_token(); 2802 if (t != tIDENT) { 2803 db_printf("Bad modifier\n"); 2804 error = EINVAL; 2805 goto out; 2806 } 2807 db_strcpy(modif, db_tok_string); 2808 } 2809 else { 2810 db_unread_token(t); 2811 modif[0] = '\0'; 2812 } 2813 2814 flags = 0; 2815 for (i = 0; i < nitems(db_sysctl_modifs); i++) { 2816 if (strchr(modif, db_sysctl_modifs[i])) { 2817 flags |= db_sysctl_modif_values[i]; 2818 } 2819 } 2820 2821 /* Parse the sysctl names */ 2822 t = db_read_token(); 2823 if (t != tIDENT) { 2824 db_printf("Need sysctl name\n"); 2825 error = EINVAL; 2826 goto out; 2827 } 2828 2829 /* Copy the name into a temporary buffer */ 2830 db_strcpy(name, db_tok_string); 2831 2832 /* Ensure there is no trailing cruft */ 2833 t = db_read_token(); 2834 if (t != tEOL) { 2835 db_printf("Unexpected sysctl argument\n"); 2836 error = EINVAL; 2837 goto out; 2838 } 2839 2840 error = db_sysctlbyname(name, flags); 2841 if (error == ENOENT) { 2842 db_printf("unknown oid: '%s'\n", db_tok_string); 2843 goto out; 2844 } else if (error) { 2845 db_printf("%s: error: %d\n", db_tok_string, error); 2846 goto out; 2847 } 2848 2849 out: 2850 /* Ensure we eat all of our text */ 2851 db_flush_lex(); 2852 2853 if (error == EINVAL) { 2854 db_sysctl_cmd_usage(); 2855 } 2856 } 2857 2858 #endif /* DDB */ 2859