freebsd-dev/sys/net/vnet.c
Bjoern A. Zeeb 89856f7e2d Get closer to a VIMAGE network stack teardown from top to bottom rather
than removing the network interfaces first. This change is rather larger
and convoluted as the ordering requirements cannot be separated.

Move the pfil(9) framework to SI_SUB_PROTO_PFIL, move Firewalls and
related modules to their own SI_SUB_PROTO_FIREWALL.
Move initialization of "physical" interfaces to SI_SUB_DRIVERS,
move virtual (cloned) interfaces to SI_SUB_PSEUDO.
Move Multicast to SI_SUB_PROTO_MC.

Re-work parts of multicast initialisation and teardown, not taking the
huge amount of memory into account if used as a module yet.

For interface teardown we try to do as many of them as we can on
SI_SUB_INIT_IF, but for some this makes no sense, e.g., when tunnelling
over a higher layer protocol such as IP. In that case the interface
has to go along (or before) the higher layer protocol is shutdown.

Kernel hhooks need to go last on teardown as they may be used at various
higher layers and we cannot remove them before we cleaned up the higher
layers.

For interface teardown there are multiple paths:
(a) a cloned interface is destroyed (inside a VIMAGE or in the base system),
(b) any interface is moved from a virtual network stack to a different
network stack ("vmove"), or (c) a virtual network stack is being shut down.
All code paths go through if_detach_internal() where we, depending on the
vmove flag or the vnet state, make a decision on how much to shut down;
in case we are destroying a VNET the individual protocol layers will
cleanup their own parts thus we cannot do so again for each interface as
we end up with, e.g., double-frees, destroying locks twice or acquiring
already destroyed locks.
When calling into protocol cleanups we equally have to tell them
whether they need to detach upper layer protocols ("ulp") or not
(e.g., in6_ifdetach()).

Provide or enahnce helper functions to do proper cleanup at a protocol
rather than at an interface level.

Approved by:		re (hrs)
Obtained from:		projects/vnet
Reviewed by:		gnn, jhb
Sponsored by:		The FreeBSD Foundation
MFC after:		2 weeks
Differential Revision:	https://reviews.freebsd.org/D6747
2016-06-21 13:48:49 +00:00

805 lines
22 KiB
C

/*-
* 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>
__FBSDID("$FreeBSD$");
#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 8192
#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.
*/
static VNET_DEFINE(char, modspace[VNET_MODMIN]);
/*
* 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");
#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;
vnet->vnet_state = 0;
SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet);
/*
* Allocate storage for virtualized global variables and copy in
* initial values form 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();
CURVNET_SET_QUIET(vnet);
vnet_sysuninit();
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)
{
/* Warn people before take off - in case we crash early. */
printf("WARNING: VIMAGE (virtualized network stack) is a highly "
"experimental feature.\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");
}
SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, 0);
/* 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();
}
/*
* 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_FOREACH(vnet) {
CURVNET_SET_QUIET(vnet);
vs->func(vs->arg);
CURVNET_RESTORE();
}
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_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();
}
/*
* 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.
*/
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.
*/
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("\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(vnet_sysinit, db_show_vnet_sysinit)
{
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(vnet_sysuninit, db_show_vnet_sysuninit)
{
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(vnetrcrs, db_show_vnetrcrs)
{
struct vnet_recursion *vnr;
SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
vnet_print_recursion(vnr, 1);
}
#endif
#endif /* DDB */