2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2004-2009 University of Zagreb
5 * Copyright (c) 2006-2009 FreeBSD Foundation
8 * This software was developed by the University of Zagreb and the
9 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
12 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
13 * Copyright (c) 2009 Robert N. M. Watson
14 * All rights reserved.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
38 #include <sys/cdefs.h>
42 #include <sys/param.h>
44 #include <sys/kernel.h>
47 #include <sys/systm.h>
48 #include <sys/sysctl.h>
49 #include <sys/eventhandler.h>
51 #include <sys/malloc.h>
53 #include <sys/socket.h>
55 #include <sys/sysctl.h>
57 #include <machine/stdarg.h>
61 #include <ddb/db_sym.h>
65 #include <net/if_var.h>
69 * This file implements core functions for virtual network stacks:
71 * - Virtual network stack management functions.
73 * - Virtual network stack memory allocator, which virtualizes global
74 * variables in the network stack
76 * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems
77 * to register startup/shutdown events to be run for each virtual network
81 FEATURE(vimage, "VIMAGE kernel virtualization");
83 static MALLOC_DEFINE(M_VNET, "vnet", "network stack control block");
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.
91 struct rwlock vnet_rwlock;
92 struct sx vnet_sxlock;
94 #define VNET_LIST_WLOCK() do { \
95 sx_xlock(&vnet_sxlock); \
96 rw_wlock(&vnet_rwlock); \
99 #define VNET_LIST_WUNLOCK() do { \
100 rw_wunlock(&vnet_rwlock); \
101 sx_xunlock(&vnet_sxlock); \
104 struct vnet_list_head vnet_head;
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.
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
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
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.
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
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.
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.
161 #define VNET_BYTES (VNET_STOP - VNET_START)
163 static MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data");
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.
172 #define VNET_MODMIN (8 * PAGE_SIZE)
173 #define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE)
176 * Space to store virtualized global variables from loadable kernel modules,
177 * and the free list to manage it.
179 VNET_DEFINE_STATIC(char, modspace[VNET_MODMIN] __aligned(__alignof(void *)));
182 * A copy of the initial values of all virtualized global variables.
184 static uintptr_t vnet_init_var;
187 * Global lists of subsystem constructor and destructors for vnets. They are
188 * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are
189 * protected by the vnet_sysinit_sxlock global lock.
191 static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors =
192 TAILQ_HEAD_INITIALIZER(vnet_constructors);
193 static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors =
194 TAILQ_HEAD_INITIALIZER(vnet_destructors);
196 struct sx vnet_sysinit_sxlock;
198 #define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock);
199 #define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock);
200 #define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock);
201 #define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock);
203 struct vnet_data_free {
206 TAILQ_ENTRY(vnet_data_free) vnd_link;
209 static MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free",
210 "VNET resource accounting");
211 static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head =
212 TAILQ_HEAD_INITIALIZER(vnet_data_free_head);
213 static struct sx vnet_data_free_lock;
215 SDT_PROVIDER_DEFINE(vnet);
216 SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, "int");
217 SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, "int",
219 SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return,
220 "int", "struct vnet *");
221 SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry,
222 "int", "struct vnet *");
223 SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return,
227 * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
229 static void vnet_sysinit(void);
230 static void vnet_sysuninit(void);
233 static void db_show_vnet_print_vs(struct vnet_sysinit *, int);
237 * Allocate a virtual network stack.
244 SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__);
245 vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO);
246 vnet->vnet_magic_n = VNET_MAGIC_N;
247 SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet);
250 * Allocate storage for virtualized global variables and copy in
251 * initial values from our 'master' copy.
253 vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK);
254 memcpy(vnet->vnet_data_mem, (void *)VNET_START, VNET_BYTES);
257 * All use of vnet-specific data will immediately subtract VNET_START
258 * from the base memory pointer, so pre-calculate that now to avoid
261 vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START;
263 /* Initialize / attach vnet module instances. */
264 CURVNET_SET_QUIET(vnet);
269 LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
272 SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet);
277 * Destroy a virtual network stack.
280 vnet_destroy(struct vnet *vnet)
283 SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet);
284 KASSERT(vnet->vnet_sockcnt == 0,
285 ("%s: vnet still has sockets", __func__));
288 LIST_REMOVE(vnet, vnet_le);
291 /* Signal that VNET is being shutdown. */
292 vnet->vnet_shutdown = true;
294 CURVNET_SET_QUIET(vnet);
295 sx_xlock(&ifnet_detach_sxlock);
297 sx_xunlock(&ifnet_detach_sxlock);
301 * Release storage for the virtual network stack instance.
303 free(vnet->vnet_data_mem, M_VNET_DATA);
304 vnet->vnet_data_mem = NULL;
305 vnet->vnet_data_base = 0;
306 vnet->vnet_magic_n = 0xdeadbeef;
308 SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__);
312 * Boot time initialization and allocation of virtual network stacks.
315 vnet_init_prelink(void *arg __unused)
318 rw_init(&vnet_rwlock, "vnet_rwlock");
319 sx_init(&vnet_sxlock, "vnet_sxlock");
320 sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock");
321 LIST_INIT(&vnet_head);
323 SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST,
324 vnet_init_prelink, NULL);
327 vnet0_init(void *arg __unused)
331 printf("VIMAGE (virtualized network stack) enabled\n");
334 * We MUST clear curvnet in vi_init_done() before going SMP,
335 * otherwise CURVNET_SET() macros would scream about unnecessary
336 * curvnet recursions.
338 curvnet = prison0.pr_vnet = vnet0 = vnet_alloc();
340 SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL);
343 vnet_init_done(void *unused __unused)
348 SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_ANY, vnet_init_done,
352 * Once on boot, initialize the modspace freelist to entirely cover modspace.
355 vnet_data_startup(void *dummy __unused)
357 struct vnet_data_free *df;
359 df = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
360 df->vnd_start = (uintptr_t)&VNET_NAME(modspace);
361 df->vnd_len = VNET_MODMIN;
362 TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link);
363 sx_init(&vnet_data_free_lock, "vnet_data alloc lock");
364 vnet_init_var = (uintptr_t)malloc(VNET_BYTES, M_VNET_DATA, M_WAITOK);
366 SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, NULL);
368 /* Dummy VNET_SYSINIT to make sure we always reach the final end state. */
370 vnet_sysinit_done(void *unused __unused)
375 VNET_SYSINIT(vnet_sysinit_done, SI_SUB_VNET_DONE, SI_ORDER_ANY,
376 vnet_sysinit_done, NULL);
379 * When a module is loaded and requires storage for a virtualized global
380 * variable, allocate space from the modspace free list. This interface
381 * should be used only by the kernel linker.
384 vnet_data_alloc(int size)
386 struct vnet_data_free *df;
390 size = roundup2(size, sizeof(void *));
391 sx_xlock(&vnet_data_free_lock);
392 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
393 if (df->vnd_len < size)
395 if (df->vnd_len == size) {
396 s = (void *)df->vnd_start;
397 TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link);
398 free(df, M_VNET_DATA_FREE);
401 s = (void *)df->vnd_start;
403 df->vnd_start = df->vnd_start + size;
406 sx_xunlock(&vnet_data_free_lock);
412 * Free space for a virtualized global variable on module unload.
415 vnet_data_free(void *start_arg, int size)
417 struct vnet_data_free *df;
418 struct vnet_data_free *dn;
422 size = roundup2(size, sizeof(void *));
423 start = (uintptr_t)start_arg;
426 * Free a region of space and merge it with as many neighbors as
427 * possible. Keeping the list sorted simplifies this operation.
429 sx_xlock(&vnet_data_free_lock);
430 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
431 if (df->vnd_start > end)
434 * If we expand at the end of an entry we may have to merge
435 * it with the one following it as well.
437 if (df->vnd_start + df->vnd_len == start) {
439 dn = TAILQ_NEXT(df, vnd_link);
440 if (df->vnd_start + df->vnd_len == dn->vnd_start) {
441 df->vnd_len += dn->vnd_len;
442 TAILQ_REMOVE(&vnet_data_free_head, dn,
444 free(dn, M_VNET_DATA_FREE);
446 sx_xunlock(&vnet_data_free_lock);
449 if (df->vnd_start == end) {
450 df->vnd_start = start;
452 sx_xunlock(&vnet_data_free_lock);
456 dn = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
457 dn->vnd_start = start;
460 TAILQ_INSERT_BEFORE(df, dn, vnd_link);
462 TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link);
463 sx_xunlock(&vnet_data_free_lock);
467 * When a new virtualized global variable has been allocated, propagate its
468 * initial value to each already-allocated virtual network stack instance.
471 vnet_data_copy(void *start, int size)
476 LIST_FOREACH(vnet, &vnet_head, vnet_le)
477 memcpy((void *)((uintptr_t)vnet->vnet_data_base +
478 (uintptr_t)start), start, size);
483 * Save a copy of the initial values of virtualized global variables.
486 vnet_save_init(void *start, size_t size)
488 MPASS(vnet_init_var != 0);
489 MPASS(VNET_START <= (uintptr_t)start &&
490 (uintptr_t)start + size <= VNET_STOP);
491 memcpy((void *)(vnet_init_var + ((uintptr_t)start - VNET_START)),
496 * Restore the 'master' copies of virtualized global variables to theirs
500 vnet_restore_init(void *start, size_t size)
502 MPASS(vnet_init_var != 0);
503 MPASS(VNET_START <= (uintptr_t)start &&
504 (uintptr_t)start + size <= VNET_STOP);
506 (void *)(vnet_init_var + ((uintptr_t)start - VNET_START)), size);
510 * Support for special SYSINIT handlers registered via VNET_SYSINIT()
511 * and VNET_SYSUNINIT().
514 vnet_register_sysinit(void *arg)
516 struct vnet_sysinit *vs, *vs2;
520 KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early"));
522 /* Add the constructor to the global list of vnet constructors. */
523 VNET_SYSINIT_WLOCK();
524 TAILQ_FOREACH(vs2, &vnet_constructors, link) {
525 if (vs2->subsystem > vs->subsystem)
527 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
531 TAILQ_INSERT_BEFORE(vs2, vs, link);
533 TAILQ_INSERT_TAIL(&vnet_constructors, vs, link);
536 * Invoke the constructor on all the existing vnets when it is
541 CURVNET_SET_QUIET(vnet);
546 VNET_SYSINIT_WUNLOCK();
550 vnet_deregister_sysinit(void *arg)
552 struct vnet_sysinit *vs;
556 /* Remove the constructor from the global list of vnet constructors. */
557 VNET_SYSINIT_WLOCK();
558 TAILQ_REMOVE(&vnet_constructors, vs, link);
559 VNET_SYSINIT_WUNLOCK();
563 vnet_register_sysuninit(void *arg)
565 struct vnet_sysinit *vs, *vs2;
569 /* Add the destructor to the global list of vnet destructors. */
570 VNET_SYSINIT_WLOCK();
571 TAILQ_FOREACH(vs2, &vnet_destructors, link) {
572 if (vs2->subsystem > vs->subsystem)
574 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
578 TAILQ_INSERT_BEFORE(vs2, vs, link);
580 TAILQ_INSERT_TAIL(&vnet_destructors, vs, link);
581 VNET_SYSINIT_WUNLOCK();
585 vnet_deregister_sysuninit(void *arg)
587 struct vnet_sysinit *vs;
593 * Invoke the destructor on all the existing vnets when it is
596 VNET_SYSINIT_WLOCK();
599 CURVNET_SET_QUIET(vnet);
604 /* Remove the destructor from the global list of vnet destructors. */
605 TAILQ_REMOVE(&vnet_destructors, vs, link);
606 VNET_SYSINIT_WUNLOCK();
611 * Invoke all registered vnet constructors on the current vnet. Used during
612 * vnet construction. The caller is responsible for ensuring the new vnet is
613 * the current vnet and that the vnet_sysinit_sxlock lock is locked.
618 struct vnet_sysinit *vs;
620 VNET_SYSINIT_RLOCK();
621 TAILQ_FOREACH(vs, &vnet_constructors, link) {
622 curvnet->vnet_state = vs->subsystem;
625 VNET_SYSINIT_RUNLOCK();
629 * Invoke all registered vnet destructors on the current vnet. Used during
630 * vnet destruction. The caller is responsible for ensuring the dying vnet
631 * the current vnet and that the vnet_sysinit_sxlock lock is locked.
636 struct vnet_sysinit *vs;
638 VNET_SYSINIT_RLOCK();
639 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
641 curvnet->vnet_state = vs->subsystem;
644 VNET_SYSINIT_RUNLOCK();
648 * EVENTHANDLER(9) extensions.
651 * Invoke the eventhandler function originally registered with the possibly
652 * registered argument for all virtual network stack instances.
654 * This iterator can only be used for eventhandlers that do not take any
655 * additional arguments, as we do ignore the variadic arguments from the
656 * EVENTHANDLER_INVOKE() call.
659 vnet_global_eventhandler_iterator_func(void *arg, ...)
661 VNET_ITERATOR_DECL(vnet_iter);
662 struct eventhandler_entry_vimage *v_ee;
665 * There is a bug here in that we should actually cast things to
666 * (struct eventhandler_entry_ ## name *) but that's not easily
667 * possible in here so just re-using the variadic version we
668 * defined for the generic vimage case.
672 VNET_FOREACH(vnet_iter) {
673 CURVNET_SET(vnet_iter);
674 ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg);
681 struct vnet_recursion {
682 SLIST_ENTRY(vnet_recursion) vnr_le;
684 const char *where_fn;
686 struct vnet *old_vnet;
687 struct vnet *new_vnet;
690 static SLIST_HEAD(, vnet_recursion) vnet_recursions =
691 SLIST_HEAD_INITIALIZER(vnet_recursions);
694 vnet_print_recursion(struct vnet_recursion *vnr, int brief)
698 printf("CURVNET_SET() recursion in ");
699 printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line,
705 printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet);
709 vnet_log_recursion(struct vnet *old_vnet, const char *old_fn, int line)
711 struct vnet_recursion *vnr;
713 /* Skip already logged recursion events. */
714 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
715 if (vnr->prev_fn == old_fn &&
716 vnr->where_fn == curthread->td_vnet_lpush &&
717 vnr->where_line == line &&
718 (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet))
721 vnr = malloc(sizeof(*vnr), M_VNET, M_NOWAIT | M_ZERO);
723 panic("%s: malloc failed", __func__);
724 vnr->prev_fn = old_fn;
725 vnr->where_fn = curthread->td_vnet_lpush;
726 vnr->where_line = line;
727 vnr->old_vnet = old_vnet;
728 vnr->new_vnet = curvnet;
730 SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le);
732 vnet_print_recursion(vnr, 0);
737 #endif /* VNET_DEBUG */
744 db_vnet_print(struct vnet *vnet)
747 db_printf("vnet = %p\n", vnet);
748 db_printf(" vnet_magic_n = %#08x (%s, orig %#08x)\n",
750 (vnet->vnet_magic_n == VNET_MAGIC_N) ?
751 "ok" : "mismatch", VNET_MAGIC_N);
752 db_printf(" vnet_ifcnt = %u\n", vnet->vnet_ifcnt);
753 db_printf(" vnet_sockcnt = %u\n", vnet->vnet_sockcnt);
754 db_printf(" vnet_data_mem = %p\n", vnet->vnet_data_mem);
755 db_printf(" vnet_data_base = %#jx\n",
756 (uintmax_t)vnet->vnet_data_base);
757 db_printf(" vnet_state = %#08x\n", vnet->vnet_state);
758 db_printf(" vnet_shutdown = %#03x\n", vnet->vnet_shutdown);
762 DB_SHOW_ALL_COMMAND(vnets, db_show_all_vnets)
764 VNET_ITERATOR_DECL(vnet_iter);
766 VNET_FOREACH(vnet_iter) {
767 db_vnet_print(vnet_iter);
773 DB_SHOW_COMMAND(vnet, db_show_vnet)
777 db_printf("usage: show vnet <struct vnet *>\n");
781 db_vnet_print((struct vnet *)addr);
785 db_show_vnet_print_vs(struct vnet_sysinit *vs, int ddb)
787 const char *vsname, *funcname;
791 #define xprint(...) \
793 db_printf(__VA_ARGS__); \
798 xprint("%s: no vnet_sysinit * given\n", __func__);
802 sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset);
803 db_symbol_values(sym, &vsname, NULL);
804 sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset);
805 db_symbol_values(sym, &funcname, NULL);
806 xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs);
807 xprint(" %#08x %#08x\n", vs->subsystem, vs->order);
808 xprint(" %p(%s)(%p)\n",
809 vs->func, (funcname != NULL) ? funcname : "", vs->arg);
813 DB_SHOW_COMMAND_FLAGS(vnet_sysinit, db_show_vnet_sysinit, DB_CMD_MEMSAFE)
815 struct vnet_sysinit *vs;
817 db_printf("VNET_SYSINIT vs Name(Ptr)\n");
818 db_printf(" Subsystem Order\n");
819 db_printf(" Function(Name)(Arg)\n");
820 TAILQ_FOREACH(vs, &vnet_constructors, link) {
821 db_show_vnet_print_vs(vs, 1);
827 DB_SHOW_COMMAND_FLAGS(vnet_sysuninit, db_show_vnet_sysuninit, DB_CMD_MEMSAFE)
829 struct vnet_sysinit *vs;
831 db_printf("VNET_SYSUNINIT vs Name(Ptr)\n");
832 db_printf(" Subsystem Order\n");
833 db_printf(" Function(Name)(Arg)\n");
834 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
836 db_show_vnet_print_vs(vs, 1);
843 DB_SHOW_COMMAND_FLAGS(vnetrcrs, db_show_vnetrcrs, DB_CMD_MEMSAFE)
845 struct vnet_recursion *vnr;
847 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
848 vnet_print_recursion(vnr, 1);