1/*- 2 * Copyright (c) 2004-2009 University of Zagreb 3 * Copyright (c) 2006-2009 FreeBSD Foundation 4 * All rights reserved. 5 * 6 * This software was developed by the University of Zagreb and the 7 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the 8 * FreeBSD Foundation. 9 * 10 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org> 11 * Copyright (c) 2009 Robert N. M. Watson 12 * All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: stable/11/sys/net/vnet.c 359652 2020-04-06 07:16:31Z hselasky $"); 38 39#include "opt_ddb.h" 40#include "opt_kdb.h" 41 42#include <sys/param.h> 43#include <sys/kdb.h> 44#include <sys/kernel.h> 45#include <sys/jail.h> 46#include <sys/sdt.h> 47#include <sys/systm.h> 48#include <sys/sysctl.h> 49#include <sys/eventhandler.h> 50#include <sys/lock.h> 51#include <sys/malloc.h> 52#include <sys/proc.h> 53#include <sys/socket.h> 54#include <sys/sx.h> 55#include <sys/sysctl.h> 56 57#include <machine/stdarg.h> 58 59#ifdef DDB 60#include <ddb/ddb.h> 61#include <ddb/db_sym.h> 62#endif 63 64#include <net/if.h> 65#include <net/if_var.h> 66#include <net/vnet.h> 67 68/*- 69 * This file implements core functions for virtual network stacks: 70 * 71 * - Virtual network stack management functions. 72 * 73 * - Virtual network stack memory allocator, which virtualizes global 74 * variables in the network stack 75 * 76 * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems 77 * to register startup/shutdown events to be run for each virtual network 78 * stack instance. 79 */ 80 81FEATURE(vimage, "VIMAGE kernel virtualization"); 82 83static MALLOC_DEFINE(M_VNET, "vnet", "network stack control block"); 84 85/* 86 * The virtual network stack list has two read-write locks, one sleepable and 87 * the other not, so that the list can be stablized and walked in a variety 88 * of network stack contexts. Both must be acquired exclusively to modify 89 * the list, but a read lock of either lock is sufficient to walk the list. 90 */ 91struct rwlock vnet_rwlock; 92struct sx vnet_sxlock; 93 94#define VNET_LIST_WLOCK() do { \ 95 sx_xlock(&vnet_sxlock); \ 96 rw_wlock(&vnet_rwlock); \ 97} while (0) 98 99#define VNET_LIST_WUNLOCK() do { \ 100 rw_wunlock(&vnet_rwlock); \ 101 sx_xunlock(&vnet_sxlock); \ 102} while (0) 103 104struct vnet_list_head vnet_head; 105struct vnet *vnet0; 106 107/* 108 * The virtual network stack allocator provides storage for virtualized 109 * global variables. These variables are defined/declared using the 110 * VNET_DEFINE()/VNET_DECLARE() macros, which place them in the 'set_vnet' 111 * linker set. The details of the implementation are somewhat subtle, but 112 * allow the majority of most network subsystems to maintain 113 * virtualization-agnostic. 114 * 115 * The virtual network stack allocator handles variables in the base kernel 116 * vs. modules in similar but different ways. In both cases, virtualized 117 * global variables are marked as such by being declared to be part of the 118 * vnet linker set. These "master" copies of global variables serve two 119 * functions: 120 * 121 * (1) They contain static initialization or "default" values for global 122 * variables which will be propagated to each virtual network stack 123 * instance when created. As with normal global variables, they default 124 * to zero-filled. 125 * 126 * (2) They act as unique global names by which the variable can be referred 127 * to, regardless of network stack instance. The single global symbol 128 * will be used to calculate the location of a per-virtual instance 129 * variable at run-time. 130 * 131 * Each virtual network stack instance has a complete copy of each 132 * virtualized global variable, stored in a malloc'd block of memory 133 * referred to by vnet->vnet_data_mem. Critical to the design is that each 134 * per-instance memory block is laid out identically to the master block so 135 * that the offset of each global variable is the same across all blocks. To 136 * optimize run-time access, a precalculated 'base' address, 137 * vnet->vnet_data_base, is stored in each vnet, and is the amount that can 138 * be added to the address of a 'master' instance of a variable to get to the 139 * per-vnet instance. 140 * 141 * Virtualized global variables are handled in a similar manner, but as each 142 * module has its own 'set_vnet' linker set, and we want to keep all 143 * virtualized globals togther, we reserve space in the kernel's linker set 144 * for potential module variables using a per-vnet character array, 145 * 'modspace'. The virtual network stack allocator maintains a free list to 146 * track what space in the array is free (all, initially) and as modules are 147 * linked, allocates portions of the space to specific globals. The kernel 148 * module linker queries the virtual network stack allocator and will 149 * bind references of the global to the location during linking. It also 150 * calls into the virtual network stack allocator, once the memory is 151 * initialized, in order to propagate the new static initializations to all 152 * existing virtual network stack instances so that the soon-to-be executing 153 * module will find every network stack instance with proper default values. 154 */ 155 156/* 157 * Number of bytes of data in the 'set_vnet' linker set, and hence the total 158 * size of all kernel virtualized global variables, and the malloc(9) type 159 * that will be used to allocate it. 160 */ 161#define VNET_BYTES (VNET_STOP - VNET_START) 162 163static MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data"); 164 165/* 166 * VNET_MODMIN is the minimum number of bytes we will reserve for the sum of 167 * global variables across all loaded modules. As this actually sizes an 168 * array declared as a virtualized global variable in the kernel itself, and 169 * we want the virtualized global variable space to be page-sized, we may 170 * have more space than that in practice. 171 */ 172#define VNET_MODMIN (8 * PAGE_SIZE) 173#define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE) 174 175/* 176 * Space to store virtualized global variables from loadable kernel modules, 177 * and the free list to manage it. 178 */ 179static VNET_DEFINE(char, modspace[VNET_MODMIN]); 180 181/* 182 * Global lists of subsystem constructor and destructors for vnets. They are 183 * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are 184 * protected by the vnet_sysinit_sxlock global lock. 185 */ 186static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors = 187 TAILQ_HEAD_INITIALIZER(vnet_constructors); 188static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors = 189 TAILQ_HEAD_INITIALIZER(vnet_destructors); 190 191struct sx vnet_sysinit_sxlock; 192 193#define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock); 194#define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock); 195#define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock); 196#define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock); 197 198struct vnet_data_free { 199 uintptr_t vnd_start; 200 int vnd_len; 201 TAILQ_ENTRY(vnet_data_free) vnd_link; 202}; 203 204static MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free", 205 "VNET resource accounting"); 206static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head = 207 TAILQ_HEAD_INITIALIZER(vnet_data_free_head); 208static struct sx vnet_data_free_lock; 209 210SDT_PROVIDER_DEFINE(vnet); 211SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, "int"); 212SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, "int", 213 "struct vnet *"); 214SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return, 215 "int", "struct vnet *"); 216SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry, 217 "int", "struct vnet *"); 218SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return, 219 "int"); 220 221#ifdef DDB 222static void db_show_vnet_print_vs(struct vnet_sysinit *, int); 223#endif 224 225/* 226 * Allocate a virtual network stack. 227 */ 228struct vnet * 229vnet_alloc(void) 230{ 231 struct vnet *vnet; 232 233 SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__); 234 vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO); 235 vnet->vnet_magic_n = VNET_MAGIC_N; 236 vnet->vnet_state = 0; 237 SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet); 238 239 /* 240 * Allocate storage for virtualized global variables and copy in 241 * initial values form our 'master' copy. 242 */ 243 vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK); 244 memcpy(vnet->vnet_data_mem, (void *)VNET_START, VNET_BYTES); 245 246 /* 247 * All use of vnet-specific data will immediately subtract VNET_START 248 * from the base memory pointer, so pre-calculate that now to avoid 249 * it on each use. 250 */ 251 vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START; 252 253 /* Initialize / attach vnet module instances. */ 254 CURVNET_SET_QUIET(vnet); 255 vnet_sysinit(); 256 CURVNET_RESTORE(); 257 258 VNET_LIST_WLOCK(); 259 LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le); 260 VNET_LIST_WUNLOCK(); 261 262 SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet); 263 return (vnet); 264} 265 266/* 267 * Destroy a virtual network stack. 268 */ 269void 270vnet_destroy(struct vnet *vnet) 271{ 272 273 SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet); 274 KASSERT(vnet->vnet_sockcnt == 0, 275 ("%s: vnet still has sockets", __func__)); 276 277 VNET_LIST_WLOCK(); 278 LIST_REMOVE(vnet, vnet_le); 279 VNET_LIST_WUNLOCK(); 280 281 CURVNET_SET_QUIET(vnet); 282 vnet_sysuninit(); 283 CURVNET_RESTORE(); 284 285 /* 286 * Release storage for the virtual network stack instance. 287 */ 288 free(vnet->vnet_data_mem, M_VNET_DATA); 289 vnet->vnet_data_mem = NULL; 290 vnet->vnet_data_base = 0; 291 vnet->vnet_magic_n = 0xdeadbeef; 292 free(vnet, M_VNET); 293 SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__); 294} 295 296/* 297 * Boot time initialization and allocation of virtual network stacks. 298 */ 299static void 300vnet_init_prelink(void *arg __unused) 301{ 302 303 rw_init(&vnet_rwlock, "vnet_rwlock"); 304 sx_init(&vnet_sxlock, "vnet_sxlock"); 305 sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock"); 306 LIST_INIT(&vnet_head); 307} 308SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST, 309 vnet_init_prelink, NULL); 310 311static void 312vnet0_init(void *arg __unused) 313{ 314 315 /* Warn people before take off - in case we crash early. */ 316 printf("WARNING: VIMAGE (virtualized network stack) is a highly " 317 "experimental feature.\n"); 318 319 /* 320 * We MUST clear curvnet in vi_init_done() before going SMP, 321 * otherwise CURVNET_SET() macros would scream about unnecessary 322 * curvnet recursions. 323 */ 324 curvnet = prison0.pr_vnet = vnet0 = vnet_alloc(); 325} 326SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL); 327 328static void 329vnet_init_done(void *unused __unused) 330{ 331 332 curvnet = NULL; 333} 334SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_ANY, vnet_init_done, 335 NULL); 336 337/* 338 * Once on boot, initialize the modspace freelist to entirely cover modspace. 339 */ 340static void 341vnet_data_startup(void *dummy __unused) 342{ 343 struct vnet_data_free *df; 344 345 df = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO); 346 df->vnd_start = (uintptr_t)&VNET_NAME(modspace); 347 df->vnd_len = VNET_MODMIN; 348 TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link); 349 sx_init(&vnet_data_free_lock, "vnet_data alloc lock"); 350} 351SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, NULL); 352 353/* Dummy VNET_SYSINIT to make sure we always reach the final end state. */ 354static void 355vnet_sysinit_done(void *unused __unused) 356{ 357 358 return; 359} 360VNET_SYSINIT(vnet_sysinit_done, SI_SUB_VNET_DONE, SI_ORDER_ANY, 361 vnet_sysinit_done, NULL); 362 363/* 364 * When a module is loaded and requires storage for a virtualized global 365 * variable, allocate space from the modspace free list. This interface 366 * should be used only by the kernel linker. 367 */ 368void * 369vnet_data_alloc(int size) 370{ 371 struct vnet_data_free *df; 372 void *s; 373 374 s = NULL; 375 size = roundup2(size, sizeof(void *)); 376 sx_xlock(&vnet_data_free_lock); 377 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) { 378 if (df->vnd_len < size) 379 continue; 380 if (df->vnd_len == size) { 381 s = (void *)df->vnd_start; 382 TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link); 383 free(df, M_VNET_DATA_FREE); 384 break; 385 } 386 s = (void *)df->vnd_start; 387 df->vnd_len -= size; 388 df->vnd_start = df->vnd_start + size; 389 break; 390 } 391 sx_xunlock(&vnet_data_free_lock); 392 393 return (s); 394} 395 396/* 397 * Free space for a virtualized global variable on module unload. 398 */ 399void 400vnet_data_free(void *start_arg, int size) 401{ 402 struct vnet_data_free *df; 403 struct vnet_data_free *dn; 404 uintptr_t start; 405 uintptr_t end; 406 407 size = roundup2(size, sizeof(void *)); 408 start = (uintptr_t)start_arg; 409 end = start + size; 410 /* 411 * Free a region of space and merge it with as many neighbors as 412 * possible. Keeping the list sorted simplifies this operation. 413 */ 414 sx_xlock(&vnet_data_free_lock); 415 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) { 416 if (df->vnd_start > end) 417 break; 418 /* 419 * If we expand at the end of an entry we may have to merge 420 * it with the one following it as well. 421 */ 422 if (df->vnd_start + df->vnd_len == start) { 423 df->vnd_len += size; 424 dn = TAILQ_NEXT(df, vnd_link); 425 if (df->vnd_start + df->vnd_len == dn->vnd_start) { 426 df->vnd_len += dn->vnd_len; 427 TAILQ_REMOVE(&vnet_data_free_head, dn, 428 vnd_link); 429 free(dn, M_VNET_DATA_FREE); 430 } 431 sx_xunlock(&vnet_data_free_lock); 432 return; 433 } 434 if (df->vnd_start == end) { 435 df->vnd_start = start; 436 df->vnd_len += size; 437 sx_xunlock(&vnet_data_free_lock); 438 return; 439 } 440 } 441 dn = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO); 442 dn->vnd_start = start; 443 dn->vnd_len = size; 444 if (df) 445 TAILQ_INSERT_BEFORE(df, dn, vnd_link); 446 else 447 TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link); 448 sx_xunlock(&vnet_data_free_lock); 449} 450 451/* 452 * When a new virtualized global variable has been allocated, propagate its 453 * initial value to each already-allocated virtual network stack instance. 454 */ 455void 456vnet_data_copy(void *start, int size) 457{ 458 struct vnet *vnet; 459 460 VNET_LIST_RLOCK(); 461 LIST_FOREACH(vnet, &vnet_head, vnet_le) 462 memcpy((void *)((uintptr_t)vnet->vnet_data_base + 463 (uintptr_t)start), start, size); 464 VNET_LIST_RUNLOCK(); 465} 466 467/* 468 * Support for special SYSINIT handlers registered via VNET_SYSINIT() 469 * and VNET_SYSUNINIT(). 470 */ 471void 472vnet_register_sysinit(void *arg) 473{ 474 struct vnet_sysinit *vs, *vs2; 475 struct vnet *vnet; 476 477 vs = arg; 478 KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early")); 479 480 /* Add the constructor to the global list of vnet constructors. */ 481 VNET_SYSINIT_WLOCK(); 482 TAILQ_FOREACH(vs2, &vnet_constructors, link) { 483 if (vs2->subsystem > vs->subsystem) 484 break; 485 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order) 486 break; 487 } 488 if (vs2 != NULL) 489 TAILQ_INSERT_BEFORE(vs2, vs, link); 490 else 491 TAILQ_INSERT_TAIL(&vnet_constructors, vs, link); 492 493 /* 494 * Invoke the constructor on all the existing vnets when it is 495 * registered. 496 */ 497 VNET_FOREACH(vnet) { 498 CURVNET_SET_QUIET(vnet); 499 vs->func(vs->arg); 500 CURVNET_RESTORE(); 501 } 502 VNET_SYSINIT_WUNLOCK(); 503} 504 505void 506vnet_deregister_sysinit(void *arg) 507{ 508 struct vnet_sysinit *vs; 509 510 vs = arg; 511 512 /* Remove the constructor from the global list of vnet constructors. */ 513 VNET_SYSINIT_WLOCK(); 514 TAILQ_REMOVE(&vnet_constructors, vs, link); 515 VNET_SYSINIT_WUNLOCK(); 516} 517 518void 519vnet_register_sysuninit(void *arg) 520{ 521 struct vnet_sysinit *vs, *vs2; 522 523 vs = arg; 524 525 /* Add the destructor to the global list of vnet destructors. */ 526 VNET_SYSINIT_WLOCK(); 527 TAILQ_FOREACH(vs2, &vnet_destructors, link) { 528 if (vs2->subsystem > vs->subsystem) 529 break; 530 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order) 531 break; 532 } 533 if (vs2 != NULL) 534 TAILQ_INSERT_BEFORE(vs2, vs, link); 535 else 536 TAILQ_INSERT_TAIL(&vnet_destructors, vs, link); 537 VNET_SYSINIT_WUNLOCK(); 538} 539 540void 541vnet_deregister_sysuninit(void *arg) 542{ 543 struct vnet_sysinit *vs; 544 struct vnet *vnet; 545 546 vs = arg; 547 548 /* 549 * Invoke the destructor on all the existing vnets when it is 550 * deregistered. 551 */ 552 VNET_SYSINIT_WLOCK(); 553 VNET_FOREACH(vnet) { 554 CURVNET_SET_QUIET(vnet); 555 vs->func(vs->arg); 556 CURVNET_RESTORE(); 557 } 558 559 /* Remove the destructor from the global list of vnet destructors. */ 560 TAILQ_REMOVE(&vnet_destructors, vs, link); 561 VNET_SYSINIT_WUNLOCK(); 562} 563 564/* 565 * Invoke all registered vnet constructors on the current vnet. Used during 566 * vnet construction. The caller is responsible for ensuring the new vnet is 567 * the current vnet and that the vnet_sysinit_sxlock lock is locked. 568 */ 569void 570vnet_sysinit(void) 571{ 572 struct vnet_sysinit *vs; 573 574 VNET_SYSINIT_RLOCK(); 575 TAILQ_FOREACH(vs, &vnet_constructors, link) { 576 curvnet->vnet_state = vs->subsystem; 577 vs->func(vs->arg); 578 } 579 VNET_SYSINIT_RUNLOCK(); 580} 581 582/* 583 * Invoke all registered vnet destructors on the current vnet. Used during 584 * vnet destruction. The caller is responsible for ensuring the dying vnet 585 * the current vnet and that the vnet_sysinit_sxlock lock is locked. 586 */ 587void 588vnet_sysuninit(void) 589{ 590 struct vnet_sysinit *vs; 591 592 VNET_SYSINIT_RLOCK(); 593 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head, 594 link) { 595 curvnet->vnet_state = vs->subsystem; 596 vs->func(vs->arg); 597 } 598 VNET_SYSINIT_RUNLOCK(); 599} 600 601/* 602 * EVENTHANDLER(9) extensions. 603 */ 604/* 605 * Invoke the eventhandler function originally registered with the possibly 606 * registered argument for all virtual network stack instances. 607 * 608 * This iterator can only be used for eventhandlers that do not take any 609 * additional arguments, as we do ignore the variadic arguments from the 610 * EVENTHANDLER_INVOKE() call. 611 */ 612void 613vnet_global_eventhandler_iterator_func(void *arg, ...) 614{ 615 VNET_ITERATOR_DECL(vnet_iter); 616 struct eventhandler_entry_vimage *v_ee; 617 618 /* 619 * There is a bug here in that we should actually cast things to 620 * (struct eventhandler_entry_ ## name *) but that's not easily 621 * possible in here so just re-using the variadic version we 622 * defined for the generic vimage case. 623 */ 624 v_ee = arg; 625 VNET_LIST_RLOCK(); 626 VNET_FOREACH(vnet_iter) { 627 CURVNET_SET(vnet_iter); 628 ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg); 629 CURVNET_RESTORE(); 630 } 631 VNET_LIST_RUNLOCK(); 632} 633 634#ifdef VNET_DEBUG 635struct vnet_recursion { 636 SLIST_ENTRY(vnet_recursion) vnr_le; 637 const char *prev_fn; 638 const char *where_fn; 639 int where_line; 640 struct vnet *old_vnet; 641 struct vnet *new_vnet; 642}; 643 644static SLIST_HEAD(, vnet_recursion) vnet_recursions = 645 SLIST_HEAD_INITIALIZER(vnet_recursions); 646 647static void 648vnet_print_recursion(struct vnet_recursion *vnr, int brief) 649{ 650 651 if (!brief) 652 printf("CURVNET_SET() recursion in "); 653 printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line, 654 vnr->prev_fn); 655 if (brief) 656 printf(", "); 657 else 658 printf("\n "); 659 printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet); 660} 661 662void 663vnet_log_recursion(struct vnet *old_vnet, const char *old_fn, int line) 664{ 665 struct vnet_recursion *vnr; 666 667 /* Skip already logged recursion events. */ 668 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le) 669 if (vnr->prev_fn == old_fn && 670 vnr->where_fn == curthread->td_vnet_lpush && 671 vnr->where_line == line && 672 (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet)) 673 return; 674 675 vnr = malloc(sizeof(*vnr), M_VNET, M_NOWAIT | M_ZERO); 676 if (vnr == NULL) 677 panic("%s: malloc failed", __func__); 678 vnr->prev_fn = old_fn; 679 vnr->where_fn = curthread->td_vnet_lpush; 680 vnr->where_line = line; 681 vnr->old_vnet = old_vnet; 682 vnr->new_vnet = curvnet; 683 684 SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le); 685 686 vnet_print_recursion(vnr, 0); 687#ifdef KDB 688 kdb_backtrace(); 689#endif 690} 691#endif /* VNET_DEBUG */ 692 693/* 694 * DDB(4). 695 */ 696#ifdef DDB 697static void 698db_vnet_print(struct vnet *vnet) 699{ 700 701 db_printf("vnet = %p\n", vnet); 702 db_printf(" vnet_magic_n = %#08x (%s, orig %#08x)\n", 703 vnet->vnet_magic_n, 704 (vnet->vnet_magic_n == VNET_MAGIC_N) ? 705 "ok" : "mismatch", VNET_MAGIC_N); 706 db_printf(" vnet_ifcnt = %u\n", vnet->vnet_ifcnt); 707 db_printf(" vnet_sockcnt = %u\n", vnet->vnet_sockcnt); 708 db_printf(" vnet_data_mem = %p\n", vnet->vnet_data_mem); 709 db_printf(" vnet_data_base = %#jx\n", 710 (uintmax_t)vnet->vnet_data_base); 711 db_printf(" vnet_state = %#08x\n", vnet->vnet_state); 712 db_printf("\n"); 713} 714 715DB_SHOW_ALL_COMMAND(vnets, db_show_all_vnets) 716{ 717 VNET_ITERATOR_DECL(vnet_iter); 718 719 VNET_FOREACH(vnet_iter) { 720 db_vnet_print(vnet_iter); 721 if (db_pager_quit) 722 break; 723 } 724} 725 726DB_SHOW_COMMAND(vnet, db_show_vnet) 727{ 728 729 if (!have_addr) { 730 db_printf("usage: show vnet <struct vnet *>\n"); 731 return; 732 } 733 734 db_vnet_print((struct vnet *)addr); 735} 736 737static void 738db_show_vnet_print_vs(struct vnet_sysinit *vs, int ddb) 739{ 740 const char *vsname, *funcname; 741 c_db_sym_t sym; 742 db_expr_t offset; 743 744#define xprint(...) \ 745 if (ddb) \ 746 db_printf(__VA_ARGS__); \ 747 else \ 748 printf(__VA_ARGS__) 749 750 if (vs == NULL) { 751 xprint("%s: no vnet_sysinit * given\n", __func__); 752 return; 753 } 754 755 sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset); 756 db_symbol_values(sym, &vsname, NULL); 757 sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset); 758 db_symbol_values(sym, &funcname, NULL); 759 xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs); 760 xprint(" %#08x %#08x\n", vs->subsystem, vs->order); 761 xprint(" %p(%s)(%p)\n", 762 vs->func, (funcname != NULL) ? funcname : "", vs->arg); 763#undef xprint 764} 765 766DB_SHOW_COMMAND(vnet_sysinit, db_show_vnet_sysinit) 767{ 768 struct vnet_sysinit *vs; 769 770 db_printf("VNET_SYSINIT vs Name(Ptr)\n"); 771 db_printf(" Subsystem Order\n"); 772 db_printf(" Function(Name)(Arg)\n"); 773 TAILQ_FOREACH(vs, &vnet_constructors, link) { 774 db_show_vnet_print_vs(vs, 1); 775 if (db_pager_quit) 776 break; 777 } 778} 779 780DB_SHOW_COMMAND(vnet_sysuninit, db_show_vnet_sysuninit) 781{ 782 struct vnet_sysinit *vs; 783 784 db_printf("VNET_SYSUNINIT vs Name(Ptr)\n"); 785 db_printf(" Subsystem Order\n"); 786 db_printf(" Function(Name)(Arg)\n"); 787 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head, 788 link) { 789 db_show_vnet_print_vs(vs, 1); 790 if (db_pager_quit) 791 break; 792 } 793} 794 795#ifdef VNET_DEBUG 796DB_SHOW_COMMAND(vnetrcrs, db_show_vnetrcrs) 797{ 798 struct vnet_recursion *vnr; 799 800 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le) 801 vnet_print_recursion(vnr, 1); 802} 803#endif 804#endif /* DDB */ 805