2 * Copyright (c) 2004-2009 University of Zagreb
3 * Copyright (c) 2006-2009 FreeBSD Foundation
6 * This software was developed by the University of Zagreb and the
7 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
10 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
11 * Copyright (c) 2009 Robert N. M. Watson
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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.
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
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
41 #include "opt_kdtrace.h"
43 #include <sys/param.h>
45 #include <sys/kernel.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
50 #include <sys/eventhandler.h>
51 #include <sys/linker_set.h>
53 #include <sys/malloc.h>
55 #include <sys/socket.h>
57 #include <sys/sysctl.h>
59 #include <machine/stdarg.h>
63 #include <ddb/db_sym.h>
67 #include <net/if_var.h>
71 * This file implements core functions for virtual network stacks:
73 * - Virtual network stack management functions.
75 * - Virtual network stack memory allocator, which virtualizes global
76 * variables in the network stack
78 * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems
79 * to register startup/shutdown events to be run for each virtual network
83 FEATURE(vimage, "VIMAGE kernel virtualization");
85 MALLOC_DEFINE(M_VNET, "vnet", "network stack control block");
88 * The virtual network stack list has two read-write locks, one sleepable and
89 * the other not, so that the list can be stablized and walked in a variety
90 * of network stack contexts. Both must be acquired exclusively to modify
91 * the list, but a read lock of either lock is sufficient to walk the list.
93 struct rwlock vnet_rwlock;
94 struct sx vnet_sxlock;
96 #define VNET_LIST_WLOCK() do { \
97 sx_xlock(&vnet_sxlock); \
98 rw_wlock(&vnet_rwlock); \
101 #define VNET_LIST_WUNLOCK() do { \
102 rw_wunlock(&vnet_rwlock); \
103 sx_xunlock(&vnet_sxlock); \
106 struct vnet_list_head vnet_head;
110 * The virtual network stack allocator provides storage for virtualized
111 * global variables. These variables are defined/declared using the
112 * VNET_DEFINE()/VNET_DECLARE() macros, which place them in the 'set_vnet'
113 * linker set. The details of the implementation are somewhat subtle, but
114 * allow the majority of most network subsystems to maintain
115 * virtualization-agnostic.
117 * The virtual network stack allocator handles variables in the base kernel
118 * vs. modules in similar but different ways. In both cases, virtualized
119 * global variables are marked as such by being declared to be part of the
120 * vnet linker set. These "master" copies of global variables serve two
123 * (1) They contain static initialization or "default" values for global
124 * variables which will be propagated to each virtual network stack
125 * instance when created. As with normal global variables, they default
128 * (2) They act as unique global names by which the variable can be referred
129 * to, regardless of network stack instance. The single global symbol
130 * will be used to calculate the location of a per-virtual instance
131 * variable at run-time.
133 * Each virtual network stack instance has a complete copy of each
134 * virtualized global variable, stored in a malloc'd block of memory
135 * referred to by vnet->vnet_data_mem. Critical to the design is that each
136 * per-instance memory block is laid out identically to the master block so
137 * that the offset of each global variable is the same across all blocks. To
138 * optimize run-time access, a precalculated 'base' address,
139 * vnet->vnet_data_base, is stored in each vnet, and is the amount that can
140 * be added to the address of a 'master' instance of a variable to get to the
143 * Virtualized global variables are handled in a similar manner, but as each
144 * module has its own 'set_vnet' linker set, and we want to keep all
145 * virtualized globals togther, we reserve space in the kernel's linker set
146 * for potential module variables using a per-vnet character array,
147 * 'modspace'. The virtual network stack allocator maintains a free list to
148 * track what space in the array is free (all, initially) and as modules are
149 * linked, allocates portions of the space to specific globals. The kernel
150 * module linker queries the virtual network stack allocator and will
151 * bind references of the global to the location during linking. It also
152 * calls into the virtual network stack allocator, once the memory is
153 * initialized, in order to propagate the new static initializations to all
154 * existing virtual network stack instances so that the soon-to-be executing
155 * module will find every network stack instance with proper default values.
159 * Number of bytes of data in the 'set_vnet' linker set, and hence the total
160 * size of all kernel virtualized global variables, and the malloc(9) type
161 * that will be used to allocate it.
163 #define VNET_BYTES (VNET_STOP - VNET_START)
165 MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data");
168 * VNET_MODMIN is the minimum number of bytes we will reserve for the sum of
169 * global variables across all loaded modules. As this actually sizes an
170 * array declared as a virtualized global variable in the kernel itself, and
171 * we want the virtualized global variable space to be page-sized, we may
172 * have more space than that in practice.
174 #define VNET_MODMIN 8192
175 #define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE)
176 #define VNET_MODSIZE (VNET_SIZE - (VNET_BYTES - VNET_MODMIN))
179 * Space to store virtualized global variables from loadable kernel modules,
180 * and the free list to manage it.
182 static VNET_DEFINE(char, modspace[VNET_MODMIN]);
185 * Global lists of subsystem constructor and destructors for vnets. They are
186 * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are
187 * protected by the vnet_sysinit_sxlock global lock.
189 static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors =
190 TAILQ_HEAD_INITIALIZER(vnet_constructors);
191 static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors =
192 TAILQ_HEAD_INITIALIZER(vnet_destructors);
194 struct sx vnet_sysinit_sxlock;
196 #define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock);
197 #define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock);
198 #define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock);
199 #define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock);
201 struct vnet_data_free {
204 TAILQ_ENTRY(vnet_data_free) vnd_link;
207 MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free", "VNET resource accounting");
208 static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head =
209 TAILQ_HEAD_INITIALIZER(vnet_data_free_head);
210 static struct sx vnet_data_free_lock;
212 SDT_PROVIDER_DEFINE(vnet);
213 SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, "int");
214 SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, "int", "struct vnet *");
215 SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return, "int", "struct vnet *");
216 SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry, "int", "struct vnet *");
217 SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return, "int");
220 static void db_show_vnet_print_vs(struct vnet_sysinit *, int);
224 * Allocate a virtual network stack.
231 SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__);
232 vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO);
233 vnet->vnet_magic_n = VNET_MAGIC_N;
234 SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet);
237 * Allocate storage for virtualized global variables and copy in
238 * initial values form our 'master' copy.
240 vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK);
241 memcpy(vnet->vnet_data_mem, (void *)VNET_START, VNET_BYTES);
244 * All use of vnet-specific data will immediately subtract VNET_START
245 * from the base memory pointer, so pre-calculate that now to avoid
248 vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START;
250 /* Initialize / attach vnet module instances. */
251 CURVNET_SET_QUIET(vnet);
256 LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
259 SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet);
264 * Destroy a virtual network stack.
267 vnet_destroy(struct vnet *vnet)
269 struct ifnet *ifp, *nifp;
271 SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet);
272 KASSERT(vnet->vnet_sockcnt == 0,
273 ("%s: vnet still has sockets", __func__));
276 LIST_REMOVE(vnet, vnet_le);
279 CURVNET_SET_QUIET(vnet);
281 /* Return all inherited interfaces to their parent vnets. */
282 TAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) {
283 if (ifp->if_home_vnet != ifp->if_vnet)
284 if_vmove(ifp, ifp->if_home_vnet);
291 * Release storage for the virtual network stack instance.
293 free(vnet->vnet_data_mem, M_VNET_DATA);
294 vnet->vnet_data_mem = NULL;
295 vnet->vnet_data_base = 0;
296 vnet->vnet_magic_n = 0xdeadbeef;
298 SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__);
302 * Boot time initialization and allocation of virtual network stacks.
305 vnet_init_prelink(void *arg)
308 rw_init(&vnet_rwlock, "vnet_rwlock");
309 sx_init(&vnet_sxlock, "vnet_sxlock");
310 sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock");
311 LIST_INIT(&vnet_head);
313 SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST,
314 vnet_init_prelink, NULL);
317 vnet0_init(void *arg)
320 /* Warn people before take off - in case we crash early. */
321 printf("WARNING: VIMAGE (virtualized network stack) is a highly "
322 "experimental feature.\n");
325 * We MUST clear curvnet in vi_init_done() before going SMP,
326 * otherwise CURVNET_SET() macros would scream about unnecessary
327 * curvnet recursions.
329 curvnet = prison0.pr_vnet = vnet0 = vnet_alloc();
331 SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL);
334 vnet_init_done(void *unused)
340 SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_FIRST, vnet_init_done,
344 * Once on boot, initialize the modspace freelist to entirely cover modspace.
347 vnet_data_startup(void *dummy __unused)
349 struct vnet_data_free *df;
351 df = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
352 df->vnd_start = (uintptr_t)&VNET_NAME(modspace);
353 df->vnd_len = VNET_MODMIN;
354 TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link);
355 sx_init(&vnet_data_free_lock, "vnet_data alloc lock");
357 SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, 0);
360 * When a module is loaded and requires storage for a virtualized global
361 * variable, allocate space from the modspace free list. This interface
362 * should be used only by the kernel linker.
365 vnet_data_alloc(int size)
367 struct vnet_data_free *df;
371 size = roundup2(size, sizeof(void *));
372 sx_xlock(&vnet_data_free_lock);
373 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
374 if (df->vnd_len < size)
376 if (df->vnd_len == size) {
377 s = (void *)df->vnd_start;
378 TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link);
379 free(df, M_VNET_DATA_FREE);
382 s = (void *)df->vnd_start;
384 df->vnd_start = df->vnd_start + size;
387 sx_xunlock(&vnet_data_free_lock);
393 * Free space for a virtualized global variable on module unload.
396 vnet_data_free(void *start_arg, int size)
398 struct vnet_data_free *df;
399 struct vnet_data_free *dn;
403 size = roundup2(size, sizeof(void *));
404 start = (uintptr_t)start_arg;
407 * Free a region of space and merge it with as many neighbors as
408 * possible. Keeping the list sorted simplifies this operation.
410 sx_xlock(&vnet_data_free_lock);
411 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
412 if (df->vnd_start > end)
415 * If we expand at the end of an entry we may have to merge
416 * it with the one following it as well.
418 if (df->vnd_start + df->vnd_len == start) {
420 dn = TAILQ_NEXT(df, vnd_link);
421 if (df->vnd_start + df->vnd_len == dn->vnd_start) {
422 df->vnd_len += dn->vnd_len;
423 TAILQ_REMOVE(&vnet_data_free_head, dn,
425 free(dn, M_VNET_DATA_FREE);
427 sx_xunlock(&vnet_data_free_lock);
430 if (df->vnd_start == end) {
431 df->vnd_start = start;
433 sx_xunlock(&vnet_data_free_lock);
437 dn = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
438 dn->vnd_start = start;
441 TAILQ_INSERT_BEFORE(df, dn, vnd_link);
443 TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link);
444 sx_xunlock(&vnet_data_free_lock);
448 * When a new virtualized global variable has been allocated, propagate its
449 * initial value to each already-allocated virtual network stack instance.
452 vnet_data_copy(void *start, int size)
457 LIST_FOREACH(vnet, &vnet_head, vnet_le)
458 memcpy((void *)((uintptr_t)vnet->vnet_data_base +
459 (uintptr_t)start), start, size);
464 * Variants on sysctl_handle_foo that know how to handle virtualized global
465 * variables: if 'arg1' is a pointer, then we transform it to the local vnet
469 vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS)
473 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
474 return (sysctl_handle_int(oidp, arg1, arg2, req));
478 vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
482 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
483 return (sysctl_handle_opaque(oidp, arg1, arg2, req));
487 vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS)
491 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
492 return (sysctl_handle_string(oidp, arg1, arg2, req));
496 vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS)
500 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
501 return (sysctl_handle_int(oidp, arg1, arg2, req));
505 * Support for special SYSINIT handlers registered via VNET_SYSINIT()
506 * and VNET_SYSUNINIT().
509 vnet_register_sysinit(void *arg)
511 struct vnet_sysinit *vs, *vs2;
515 KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early"));
517 /* Add the constructor to the global list of vnet constructors. */
518 VNET_SYSINIT_WLOCK();
519 TAILQ_FOREACH(vs2, &vnet_constructors, link) {
520 if (vs2->subsystem > vs->subsystem)
522 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
526 TAILQ_INSERT_BEFORE(vs2, vs, link);
528 TAILQ_INSERT_TAIL(&vnet_constructors, vs, link);
531 * Invoke the constructor on all the existing vnets when it is
535 CURVNET_SET_QUIET(vnet);
539 VNET_SYSINIT_WUNLOCK();
543 vnet_deregister_sysinit(void *arg)
545 struct vnet_sysinit *vs;
549 /* Remove the constructor from the global list of vnet constructors. */
550 VNET_SYSINIT_WLOCK();
551 TAILQ_REMOVE(&vnet_constructors, vs, link);
552 VNET_SYSINIT_WUNLOCK();
556 vnet_register_sysuninit(void *arg)
558 struct vnet_sysinit *vs, *vs2;
562 /* Add the destructor to the global list of vnet destructors. */
563 VNET_SYSINIT_WLOCK();
564 TAILQ_FOREACH(vs2, &vnet_destructors, link) {
565 if (vs2->subsystem > vs->subsystem)
567 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
571 TAILQ_INSERT_BEFORE(vs2, vs, link);
573 TAILQ_INSERT_TAIL(&vnet_destructors, vs, link);
574 VNET_SYSINIT_WUNLOCK();
578 vnet_deregister_sysuninit(void *arg)
580 struct vnet_sysinit *vs;
586 * Invoke the destructor on all the existing vnets when it is
589 VNET_SYSINIT_WLOCK();
591 CURVNET_SET_QUIET(vnet);
596 /* Remove the destructor from the global list of vnet destructors. */
597 TAILQ_REMOVE(&vnet_destructors, vs, link);
598 VNET_SYSINIT_WUNLOCK();
602 * Invoke all registered vnet constructors on the current vnet. Used during
603 * vnet construction. The caller is responsible for ensuring the new vnet is
604 * the current vnet and that the vnet_sysinit_sxlock lock is locked.
609 struct vnet_sysinit *vs;
611 VNET_SYSINIT_RLOCK();
612 TAILQ_FOREACH(vs, &vnet_constructors, link) {
615 VNET_SYSINIT_RUNLOCK();
619 * Invoke all registered vnet destructors on the current vnet. Used during
620 * vnet destruction. The caller is responsible for ensuring the dying vnet
621 * the current vnet and that the vnet_sysinit_sxlock lock is locked.
626 struct vnet_sysinit *vs;
628 VNET_SYSINIT_RLOCK();
629 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
633 VNET_SYSINIT_RUNLOCK();
637 * EVENTHANDLER(9) extensions.
640 * Invoke the eventhandler function originally registered with the possibly
641 * registered argument for all virtual network stack instances.
643 * This iterator can only be used for eventhandlers that do not take any
644 * additional arguments, as we do ignore the variadic arguments from the
645 * EVENTHANDLER_INVOKE() call.
648 vnet_global_eventhandler_iterator_func(void *arg, ...)
650 VNET_ITERATOR_DECL(vnet_iter);
651 struct eventhandler_entry_vimage *v_ee;
654 * There is a bug here in that we should actually cast things to
655 * (struct eventhandler_entry_ ## name *) but that's not easily
656 * possible in here so just re-using the variadic version we
657 * defined for the generic vimage case.
661 VNET_FOREACH(vnet_iter) {
662 CURVNET_SET(vnet_iter);
663 ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg);
670 struct vnet_recursion {
671 SLIST_ENTRY(vnet_recursion) vnr_le;
673 const char *where_fn;
675 struct vnet *old_vnet;
676 struct vnet *new_vnet;
679 static SLIST_HEAD(, vnet_recursion) vnet_recursions =
680 SLIST_HEAD_INITIALIZER(vnet_recursions);
683 vnet_print_recursion(struct vnet_recursion *vnr, int brief)
687 printf("CURVNET_SET() recursion in ");
688 printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line,
694 printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet);
698 vnet_log_recursion(struct vnet *old_vnet, const char *old_fn, int line)
700 struct vnet_recursion *vnr;
702 /* Skip already logged recursion events. */
703 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
704 if (vnr->prev_fn == old_fn &&
705 vnr->where_fn == curthread->td_vnet_lpush &&
706 vnr->where_line == line &&
707 (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet))
710 vnr = malloc(sizeof(*vnr), M_VNET, M_NOWAIT | M_ZERO);
712 panic("%s: malloc failed", __func__);
713 vnr->prev_fn = old_fn;
714 vnr->where_fn = curthread->td_vnet_lpush;
715 vnr->where_line = line;
716 vnr->old_vnet = old_vnet;
717 vnr->new_vnet = curvnet;
719 SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le);
721 vnet_print_recursion(vnr, 0);
726 #endif /* VNET_DEBUG */
732 DB_SHOW_COMMAND(vnets, db_show_vnets)
734 VNET_ITERATOR_DECL(vnet_iter);
736 VNET_FOREACH(vnet_iter) {
737 db_printf("vnet = %p\n", vnet_iter);
738 db_printf(" vnet_magic_n = 0x%x (%s, orig 0x%x)\n",
739 vnet_iter->vnet_magic_n,
740 (vnet_iter->vnet_magic_n == VNET_MAGIC_N) ?
741 "ok" : "mismatch", VNET_MAGIC_N);
742 db_printf(" vnet_ifcnt = %u\n", vnet_iter->vnet_ifcnt);
743 db_printf(" vnet_sockcnt = %u\n", vnet_iter->vnet_sockcnt);
744 db_printf(" vnet_data_mem = %p\n", vnet_iter->vnet_data_mem);
745 db_printf(" vnet_data_base = 0x%jx\n",
746 (uintmax_t)vnet_iter->vnet_data_base);
754 db_show_vnet_print_vs(struct vnet_sysinit *vs, int ddb)
756 const char *vsname, *funcname;
760 #define xprint(...) \
762 db_printf(__VA_ARGS__); \
767 xprint("%s: no vnet_sysinit * given\n", __func__);
771 sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset);
772 db_symbol_values(sym, &vsname, NULL);
773 sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset);
774 db_symbol_values(sym, &funcname, NULL);
775 xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs);
776 xprint(" 0x%08x 0x%08x\n", vs->subsystem, vs->order);
777 xprint(" %p(%s)(%p)\n",
778 vs->func, (funcname != NULL) ? funcname : "", vs->arg);
782 DB_SHOW_COMMAND(vnet_sysinit, db_show_vnet_sysinit)
784 struct vnet_sysinit *vs;
786 db_printf("VNET_SYSINIT vs Name(Ptr)\n");
787 db_printf(" Subsystem Order\n");
788 db_printf(" Function(Name)(Arg)\n");
789 TAILQ_FOREACH(vs, &vnet_constructors, link) {
790 db_show_vnet_print_vs(vs, 1);
796 DB_SHOW_COMMAND(vnet_sysuninit, db_show_vnet_sysuninit)
798 struct vnet_sysinit *vs;
800 db_printf("VNET_SYSUNINIT vs Name(Ptr)\n");
801 db_printf(" Subsystem Order\n");
802 db_printf(" Function(Name)(Arg)\n");
803 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
805 db_show_vnet_print_vs(vs, 1);
812 DB_SHOW_COMMAND(vnetrcrs, db_show_vnetrcrs)
814 struct vnet_recursion *vnr;
816 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
817 vnet_print_recursion(vnr, 1);