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- /*-
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2004-2009 University of Zagreb
- * Copyright (c) 2006-2009 FreeBSD Foundation
- * All rights reserved.
- *
- * This software was developed by the University of Zagreb and the
- * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
- * FreeBSD Foundation.
- *
- * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
- * Copyright (c) 2009 Robert N. M. Watson
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- #include "opt_ddb.h"
- #include "opt_kdb.h"
- #include <sys/param.h>
- #include <sys/kdb.h>
- #include <sys/kernel.h>
- #include <sys/jail.h>
- #include <sys/sdt.h>
- #include <sys/systm.h>
- #include <sys/sysctl.h>
- #include <sys/eventhandler.h>
- #include <sys/lock.h>
- #include <sys/malloc.h>
- #include <sys/proc.h>
- #include <sys/socket.h>
- #include <sys/sx.h>
- #include <sys/sysctl.h>
- #include <machine/stdarg.h>
- #ifdef DDB
- #include <ddb/ddb.h>
- #include <ddb/db_sym.h>
- #endif
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/vnet.h>
- /*-
- * This file implements core functions for virtual network stacks:
- *
- * - Virtual network stack management functions.
- *
- * - Virtual network stack memory allocator, which virtualizes global
- * variables in the network stack
- *
- * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems
- * to register startup/shutdown events to be run for each virtual network
- * stack instance.
- */
- FEATURE(vimage, "VIMAGE kernel virtualization");
- static MALLOC_DEFINE(M_VNET, "vnet", "network stack control block");
- /*
- * The virtual network stack list has two read-write locks, one sleepable and
- * the other not, so that the list can be stablized and walked in a variety
- * of network stack contexts. Both must be acquired exclusively to modify
- * the list, but a read lock of either lock is sufficient to walk the list.
- */
- struct rwlock vnet_rwlock;
- struct sx vnet_sxlock;
- #define VNET_LIST_WLOCK() do { \
- sx_xlock(&vnet_sxlock); \
- rw_wlock(&vnet_rwlock); \
- } while (0)
- #define VNET_LIST_WUNLOCK() do { \
- rw_wunlock(&vnet_rwlock); \
- sx_xunlock(&vnet_sxlock); \
- } while (0)
- struct vnet_list_head vnet_head;
- struct vnet *vnet0;
- /*
- * The virtual network stack allocator provides storage for virtualized
- * global variables. These variables are defined/declared using the
- * VNET_DEFINE()/VNET_DECLARE() macros, which place them in the 'set_vnet'
- * linker set. The details of the implementation are somewhat subtle, but
- * allow the majority of most network subsystems to maintain
- * virtualization-agnostic.
- *
- * The virtual network stack allocator handles variables in the base kernel
- * vs. modules in similar but different ways. In both cases, virtualized
- * global variables are marked as such by being declared to be part of the
- * vnet linker set. These "master" copies of global variables serve two
- * functions:
- *
- * (1) They contain static initialization or "default" values for global
- * variables which will be propagated to each virtual network stack
- * instance when created. As with normal global variables, they default
- * to zero-filled.
- *
- * (2) They act as unique global names by which the variable can be referred
- * to, regardless of network stack instance. The single global symbol
- * will be used to calculate the location of a per-virtual instance
- * variable at run-time.
- *
- * Each virtual network stack instance has a complete copy of each
- * virtualized global variable, stored in a malloc'd block of memory
- * referred to by vnet->vnet_data_mem. Critical to the design is that each
- * per-instance memory block is laid out identically to the master block so
- * that the offset of each global variable is the same across all blocks. To
- * optimize run-time access, a precalculated 'base' address,
- * vnet->vnet_data_base, is stored in each vnet, and is the amount that can
- * be added to the address of a 'master' instance of a variable to get to the
- * per-vnet instance.
- *
- * Virtualized global variables are handled in a similar manner, but as each
- * module has its own 'set_vnet' linker set, and we want to keep all
- * virtualized globals togther, we reserve space in the kernel's linker set
- * for potential module variables using a per-vnet character array,
- * 'modspace'. The virtual network stack allocator maintains a free list to
- * track what space in the array is free (all, initially) and as modules are
- * linked, allocates portions of the space to specific globals. The kernel
- * module linker queries the virtual network stack allocator and will
- * bind references of the global to the location during linking. It also
- * calls into the virtual network stack allocator, once the memory is
- * initialized, in order to propagate the new static initializations to all
- * existing virtual network stack instances so that the soon-to-be executing
- * module will find every network stack instance with proper default values.
- */
- /*
- * Number of bytes of data in the 'set_vnet' linker set, and hence the total
- * size of all kernel virtualized global variables, and the malloc(9) type
- * that will be used to allocate it.
- */
- #define VNET_BYTES (VNET_STOP - VNET_START)
- static MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data");
- /*
- * VNET_MODMIN is the minimum number of bytes we will reserve for the sum of
- * global variables across all loaded modules. As this actually sizes an
- * array declared as a virtualized global variable in the kernel itself, and
- * we want the virtualized global variable space to be page-sized, we may
- * have more space than that in practice.
- */
- #define VNET_MODMIN (8 * PAGE_SIZE)
- #define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE)
- /*
- * Space to store virtualized global variables from loadable kernel modules,
- * and the free list to manage it.
- */
- VNET_DEFINE_STATIC(char, modspace[VNET_MODMIN] __aligned(__alignof(void *)));
- /*
- * A copy of the initial values of all virtualized global variables.
- */
- static uintptr_t vnet_init_var;
- /*
- * Global lists of subsystem constructor and destructors for vnets. They are
- * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are
- * protected by the vnet_sysinit_sxlock global lock.
- */
- static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors =
- TAILQ_HEAD_INITIALIZER(vnet_constructors);
- static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors =
- TAILQ_HEAD_INITIALIZER(vnet_destructors);
- struct sx vnet_sysinit_sxlock;
- #define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock);
- #define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock);
- #define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock);
- #define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock);
- struct vnet_data_free {
- uintptr_t vnd_start;
- int vnd_len;
- TAILQ_ENTRY(vnet_data_free) vnd_link;
- };
- static MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free",
- "VNET resource accounting");
- static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head =
- TAILQ_HEAD_INITIALIZER(vnet_data_free_head);
- static struct sx vnet_data_free_lock;
- SDT_PROVIDER_DEFINE(vnet);
- SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, "int");
- SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, "int",
- "struct vnet *");
- SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return,
- "int", "struct vnet *");
- SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry,
- "int", "struct vnet *");
- SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return,
- "int");
- /*
- * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
- */
- static void vnet_sysinit(void);
- static void vnet_sysuninit(void);
- #ifdef DDB
- static void db_show_vnet_print_vs(struct vnet_sysinit *, int);
- #endif
- /*
- * Allocate a virtual network stack.
- */
- struct vnet *
- vnet_alloc(void)
- {
- struct vnet *vnet;
- SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__);
- vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO);
- vnet->vnet_magic_n = VNET_MAGIC_N;
- SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet);
- /*
- * Allocate storage for virtualized global variables and copy in
- * initial values from our 'master' copy.
- */
- vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK);
- memcpy(vnet->vnet_data_mem, (void *)VNET_START, VNET_BYTES);
- /*
- * All use of vnet-specific data will immediately subtract VNET_START
- * from the base memory pointer, so pre-calculate that now to avoid
- * it on each use.
- */
- vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START;
- /* Initialize / attach vnet module instances. */
- CURVNET_SET_QUIET(vnet);
- vnet_sysinit();
- CURVNET_RESTORE();
- VNET_LIST_WLOCK();
- LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
- VNET_LIST_WUNLOCK();
- SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet);
- return (vnet);
- }
- /*
- * Destroy a virtual network stack.
- */
- void
- vnet_destroy(struct vnet *vnet)
- {
- SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet);
- KASSERT(vnet->vnet_sockcnt == 0,
- ("%s: vnet still has sockets", __func__));
- VNET_LIST_WLOCK();
- LIST_REMOVE(vnet, vnet_le);
- VNET_LIST_WUNLOCK();
- /* Signal that VNET is being shutdown. */
- vnet->vnet_shutdown = true;
- CURVNET_SET_QUIET(vnet);
- sx_xlock(&ifnet_detach_sxlock);
- vnet_sysuninit();
- sx_xunlock(&ifnet_detach_sxlock);
- CURVNET_RESTORE();
- /*
- * Release storage for the virtual network stack instance.
- */
- free(vnet->vnet_data_mem, M_VNET_DATA);
- vnet->vnet_data_mem = NULL;
- vnet->vnet_data_base = 0;
- vnet->vnet_magic_n = 0xdeadbeef;
- free(vnet, M_VNET);
- SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__);
- }
- /*
- * Boot time initialization and allocation of virtual network stacks.
- */
- static void
- vnet_init_prelink(void *arg __unused)
- {
- rw_init(&vnet_rwlock, "vnet_rwlock");
- sx_init(&vnet_sxlock, "vnet_sxlock");
- sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock");
- LIST_INIT(&vnet_head);
- }
- SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST,
- vnet_init_prelink, NULL);
- static void
- vnet0_init(void *arg __unused)
- {
- if (bootverbose)
- printf("VIMAGE (virtualized network stack) enabled\n");
- /*
- * We MUST clear curvnet in vi_init_done() before going SMP,
- * otherwise CURVNET_SET() macros would scream about unnecessary
- * curvnet recursions.
- */
- curvnet = prison0.pr_vnet = vnet0 = vnet_alloc();
- }
- SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL);
- static void
- vnet_init_done(void *unused __unused)
- {
- curvnet = NULL;
- }
- SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_ANY, vnet_init_done,
- NULL);
- /*
- * Once on boot, initialize the modspace freelist to entirely cover modspace.
- */
- static void
- vnet_data_startup(void *dummy __unused)
- {
- struct vnet_data_free *df;
- df = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
- df->vnd_start = (uintptr_t)&VNET_NAME(modspace);
- df->vnd_len = VNET_MODMIN;
- TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link);
- sx_init(&vnet_data_free_lock, "vnet_data alloc lock");
- vnet_init_var = (uintptr_t)malloc(VNET_BYTES, M_VNET_DATA, M_WAITOK);
- }
- SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, NULL);
- /* Dummy VNET_SYSINIT to make sure we always reach the final end state. */
- static void
- vnet_sysinit_done(void *unused __unused)
- {
- return;
- }
- VNET_SYSINIT(vnet_sysinit_done, SI_SUB_VNET_DONE, SI_ORDER_ANY,
- vnet_sysinit_done, NULL);
- /*
- * When a module is loaded and requires storage for a virtualized global
- * variable, allocate space from the modspace free list. This interface
- * should be used only by the kernel linker.
- */
- void *
- vnet_data_alloc(int size)
- {
- struct vnet_data_free *df;
- void *s;
- s = NULL;
- size = roundup2(size, sizeof(void *));
- sx_xlock(&vnet_data_free_lock);
- TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
- if (df->vnd_len < size)
- continue;
- if (df->vnd_len == size) {
- s = (void *)df->vnd_start;
- TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link);
- free(df, M_VNET_DATA_FREE);
- break;
- }
- s = (void *)df->vnd_start;
- df->vnd_len -= size;
- df->vnd_start = df->vnd_start + size;
- break;
- }
- sx_xunlock(&vnet_data_free_lock);
- return (s);
- }
- /*
- * Free space for a virtualized global variable on module unload.
- */
- void
- vnet_data_free(void *start_arg, int size)
- {
- struct vnet_data_free *df;
- struct vnet_data_free *dn;
- uintptr_t start;
- uintptr_t end;
- size = roundup2(size, sizeof(void *));
- start = (uintptr_t)start_arg;
- end = start + size;
- /*
- * Free a region of space and merge it with as many neighbors as
- * possible. Keeping the list sorted simplifies this operation.
- */
- sx_xlock(&vnet_data_free_lock);
- TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
- if (df->vnd_start > end)
- break;
- /*
- * If we expand at the end of an entry we may have to merge
- * it with the one following it as well.
- */
- if (df->vnd_start + df->vnd_len == start) {
- df->vnd_len += size;
- dn = TAILQ_NEXT(df, vnd_link);
- if (df->vnd_start + df->vnd_len == dn->vnd_start) {
- df->vnd_len += dn->vnd_len;
- TAILQ_REMOVE(&vnet_data_free_head, dn,
- vnd_link);
- free(dn, M_VNET_DATA_FREE);
- }
- sx_xunlock(&vnet_data_free_lock);
- return;
- }
- if (df->vnd_start == end) {
- df->vnd_start = start;
- df->vnd_len += size;
- sx_xunlock(&vnet_data_free_lock);
- return;
- }
- }
- dn = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
- dn->vnd_start = start;
- dn->vnd_len = size;
- if (df)
- TAILQ_INSERT_BEFORE(df, dn, vnd_link);
- else
- TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link);
- sx_xunlock(&vnet_data_free_lock);
- }
- /*
- * When a new virtualized global variable has been allocated, propagate its
- * initial value to each already-allocated virtual network stack instance.
- */
- void
- vnet_data_copy(void *start, int size)
- {
- struct vnet *vnet;
- VNET_LIST_RLOCK();
- LIST_FOREACH(vnet, &vnet_head, vnet_le)
- memcpy((void *)((uintptr_t)vnet->vnet_data_base +
- (uintptr_t)start), start, size);
- VNET_LIST_RUNLOCK();
- }
- /*
- * Save a copy of the initial values of virtualized global variables.
- */
- void
- vnet_save_init(void *start, size_t size)
- {
- MPASS(vnet_init_var != 0);
- MPASS(VNET_START <= (uintptr_t)start &&
- (uintptr_t)start + size <= VNET_STOP);
- memcpy((void *)(vnet_init_var + ((uintptr_t)start - VNET_START)),
- start, size);
- }
- /*
- * Restore the 'master' copies of virtualized global variables to theirs
- * initial values.
- */
- void
- vnet_restore_init(void *start, size_t size)
- {
- MPASS(vnet_init_var != 0);
- MPASS(VNET_START <= (uintptr_t)start &&
- (uintptr_t)start + size <= VNET_STOP);
- memcpy(start,
- (void *)(vnet_init_var + ((uintptr_t)start - VNET_START)), size);
- }
- /*
- * Support for special SYSINIT handlers registered via VNET_SYSINIT()
- * and VNET_SYSUNINIT().
- */
- void
- vnet_register_sysinit(void *arg)
- {
- struct vnet_sysinit *vs, *vs2;
- struct vnet *vnet;
- vs = arg;
- KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early"));
- /* Add the constructor to the global list of vnet constructors. */
- VNET_SYSINIT_WLOCK();
- TAILQ_FOREACH(vs2, &vnet_constructors, link) {
- if (vs2->subsystem > vs->subsystem)
- break;
- if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
- break;
- }
- if (vs2 != NULL)
- TAILQ_INSERT_BEFORE(vs2, vs, link);
- else
- TAILQ_INSERT_TAIL(&vnet_constructors, vs, link);
- /*
- * Invoke the constructor on all the existing vnets when it is
- * registered.
- */
- VNET_LIST_RLOCK();
- VNET_FOREACH(vnet) {
- CURVNET_SET_QUIET(vnet);
- vs->func(vs->arg);
- CURVNET_RESTORE();
- }
- VNET_LIST_RUNLOCK();
- VNET_SYSINIT_WUNLOCK();
- }
- void
- vnet_deregister_sysinit(void *arg)
- {
- struct vnet_sysinit *vs;
- vs = arg;
- /* Remove the constructor from the global list of vnet constructors. */
- VNET_SYSINIT_WLOCK();
- TAILQ_REMOVE(&vnet_constructors, vs, link);
- VNET_SYSINIT_WUNLOCK();
- }
- void
- vnet_register_sysuninit(void *arg)
- {
- struct vnet_sysinit *vs, *vs2;
- vs = arg;
- /* Add the destructor to the global list of vnet destructors. */
- VNET_SYSINIT_WLOCK();
- TAILQ_FOREACH(vs2, &vnet_destructors, link) {
- if (vs2->subsystem > vs->subsystem)
- break;
- if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
- break;
- }
- if (vs2 != NULL)
- TAILQ_INSERT_BEFORE(vs2, vs, link);
- else
- TAILQ_INSERT_TAIL(&vnet_destructors, vs, link);
- VNET_SYSINIT_WUNLOCK();
- }
- void
- vnet_deregister_sysuninit(void *arg)
- {
- struct vnet_sysinit *vs;
- struct vnet *vnet;
- vs = arg;
- /*
- * Invoke the destructor on all the existing vnets when it is
- * deregistered.
- */
- VNET_SYSINIT_WLOCK();
- VNET_LIST_RLOCK();
- VNET_FOREACH(vnet) {
- CURVNET_SET_QUIET(vnet);
- vs->func(vs->arg);
- CURVNET_RESTORE();
- }
- /* Remove the destructor from the global list of vnet destructors. */
- TAILQ_REMOVE(&vnet_destructors, vs, link);
- VNET_SYSINIT_WUNLOCK();
- VNET_LIST_RUNLOCK();
- }
- /*
- * Invoke all registered vnet constructors on the current vnet. Used during
- * vnet construction. The caller is responsible for ensuring the new vnet is
- * the current vnet and that the vnet_sysinit_sxlock lock is locked.
- */
- static void
- vnet_sysinit(void)
- {
- struct vnet_sysinit *vs;
- VNET_SYSINIT_RLOCK();
- TAILQ_FOREACH(vs, &vnet_constructors, link) {
- curvnet->vnet_state = vs->subsystem;
- vs->func(vs->arg);
- }
- VNET_SYSINIT_RUNLOCK();
- }
- /*
- * Invoke all registered vnet destructors on the current vnet. Used during
- * vnet destruction. The caller is responsible for ensuring the dying vnet
- * the current vnet and that the vnet_sysinit_sxlock lock is locked.
- */
- static void
- vnet_sysuninit(void)
- {
- struct vnet_sysinit *vs;
- VNET_SYSINIT_RLOCK();
- TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
- link) {
- curvnet->vnet_state = vs->subsystem;
- vs->func(vs->arg);
- }
- VNET_SYSINIT_RUNLOCK();
- }
- /*
- * EVENTHANDLER(9) extensions.
- */
- /*
- * Invoke the eventhandler function originally registered with the possibly
- * registered argument for all virtual network stack instances.
- *
- * This iterator can only be used for eventhandlers that do not take any
- * additional arguments, as we do ignore the variadic arguments from the
- * EVENTHANDLER_INVOKE() call.
- */
- void
- vnet_global_eventhandler_iterator_func(void *arg, ...)
- {
- VNET_ITERATOR_DECL(vnet_iter);
- struct eventhandler_entry_vimage *v_ee;
- /*
- * There is a bug here in that we should actually cast things to
- * (struct eventhandler_entry_ ## name *) but that's not easily
- * possible in here so just re-using the variadic version we
- * defined for the generic vimage case.
- */
- v_ee = arg;
- VNET_LIST_RLOCK();
- VNET_FOREACH(vnet_iter) {
- CURVNET_SET(vnet_iter);
- ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg);
- CURVNET_RESTORE();
- }
- VNET_LIST_RUNLOCK();
- }
- #ifdef VNET_DEBUG
- struct vnet_recursion {
- SLIST_ENTRY(vnet_recursion) vnr_le;
- const char *prev_fn;
- const char *where_fn;
- int where_line;
- struct vnet *old_vnet;
- struct vnet *new_vnet;
- };
- static SLIST_HEAD(, vnet_recursion) vnet_recursions =
- SLIST_HEAD_INITIALIZER(vnet_recursions);
- static void
- vnet_print_recursion(struct vnet_recursion *vnr, int brief)
- {
- if (!brief)
- printf("CURVNET_SET() recursion in ");
- printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line,
- vnr->prev_fn);
- if (brief)
- printf(", ");
- else
- printf("\n ");
- printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet);
- }
- void
- vnet_log_recursion(struct vnet *old_vnet, const char *old_fn, int line)
- {
- struct vnet_recursion *vnr;
- /* Skip already logged recursion events. */
- SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
- if (vnr->prev_fn == old_fn &&
- vnr->where_fn == curthread->td_vnet_lpush &&
- vnr->where_line == line &&
- (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet))
- return;
- vnr = malloc(sizeof(*vnr), M_VNET, M_NOWAIT | M_ZERO);
- if (vnr == NULL)
- panic("%s: malloc failed", __func__);
- vnr->prev_fn = old_fn;
- vnr->where_fn = curthread->td_vnet_lpush;
- vnr->where_line = line;
- vnr->old_vnet = old_vnet;
- vnr->new_vnet = curvnet;
- SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le);
- vnet_print_recursion(vnr, 0);
- #ifdef KDB
- kdb_backtrace();
- #endif
- }
- #endif /* VNET_DEBUG */
- /*
- * DDB(4).
- */
- #ifdef DDB
- static void
- db_vnet_print(struct vnet *vnet)
- {
- db_printf("vnet = %p\n", vnet);
- db_printf(" vnet_magic_n = %#08x (%s, orig %#08x)\n",
- vnet->vnet_magic_n,
- (vnet->vnet_magic_n == VNET_MAGIC_N) ?
- "ok" : "mismatch", VNET_MAGIC_N);
- db_printf(" vnet_ifcnt = %u\n", vnet->vnet_ifcnt);
- db_printf(" vnet_sockcnt = %u\n", vnet->vnet_sockcnt);
- db_printf(" vnet_data_mem = %p\n", vnet->vnet_data_mem);
- db_printf(" vnet_data_base = %#jx\n",
- (uintmax_t)vnet->vnet_data_base);
- db_printf(" vnet_state = %#08x\n", vnet->vnet_state);
- db_printf(" vnet_shutdown = %#03x\n", vnet->vnet_shutdown);
- db_printf("\n");
- }
- DB_SHOW_ALL_COMMAND(vnets, db_show_all_vnets)
- {
- VNET_ITERATOR_DECL(vnet_iter);
- VNET_FOREACH(vnet_iter) {
- db_vnet_print(vnet_iter);
- if (db_pager_quit)
- break;
- }
- }
- DB_SHOW_COMMAND(vnet, db_show_vnet)
- {
- if (!have_addr) {
- db_printf("usage: show vnet <struct vnet *>\n");
- return;
- }
- db_vnet_print((struct vnet *)addr);
- }
- static void
- db_show_vnet_print_vs(struct vnet_sysinit *vs, int ddb)
- {
- const char *vsname, *funcname;
- c_db_sym_t sym;
- db_expr_t offset;
- #define xprint(...) \
- if (ddb) \
- db_printf(__VA_ARGS__); \
- else \
- printf(__VA_ARGS__)
- if (vs == NULL) {
- xprint("%s: no vnet_sysinit * given\n", __func__);
- return;
- }
- sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset);
- db_symbol_values(sym, &vsname, NULL);
- sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset);
- db_symbol_values(sym, &funcname, NULL);
- xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs);
- xprint(" %#08x %#08x\n", vs->subsystem, vs->order);
- xprint(" %p(%s)(%p)\n",
- vs->func, (funcname != NULL) ? funcname : "", vs->arg);
- #undef xprint
- }
- DB_SHOW_COMMAND_FLAGS(vnet_sysinit, db_show_vnet_sysinit, DB_CMD_MEMSAFE)
- {
- struct vnet_sysinit *vs;
- db_printf("VNET_SYSINIT vs Name(Ptr)\n");
- db_printf(" Subsystem Order\n");
- db_printf(" Function(Name)(Arg)\n");
- TAILQ_FOREACH(vs, &vnet_constructors, link) {
- db_show_vnet_print_vs(vs, 1);
- if (db_pager_quit)
- break;
- }
- }
- DB_SHOW_COMMAND_FLAGS(vnet_sysuninit, db_show_vnet_sysuninit, DB_CMD_MEMSAFE)
- {
- struct vnet_sysinit *vs;
- db_printf("VNET_SYSUNINIT vs Name(Ptr)\n");
- db_printf(" Subsystem Order\n");
- db_printf(" Function(Name)(Arg)\n");
- TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
- link) {
- db_show_vnet_print_vs(vs, 1);
- if (db_pager_quit)
- break;
- }
- }
- #ifdef VNET_DEBUG
- DB_SHOW_COMMAND_FLAGS(vnetrcrs, db_show_vnetrcrs, DB_CMD_MEMSAFE)
- {
- struct vnet_recursion *vnr;
- SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
- vnet_print_recursion(vnr, 1);
- }
- #endif
- #endif /* DDB */
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