522 lines
14 KiB
C
522 lines
14 KiB
C
|
/*-
|
||
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
||
|
*
|
||
|
* Copyright (c) 2016-2017
|
||
|
* Netflix Inc. 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 <sys/param.h>
|
||
|
#include <sys/conf.h>
|
||
|
#include <sys/fcntl.h>
|
||
|
#include <sys/filio.h>
|
||
|
#include <sys/kernel.h>
|
||
|
#include <sys/lock.h>
|
||
|
#include <sys/malloc.h>
|
||
|
#include <sys/module.h>
|
||
|
#include <sys/poll.h>
|
||
|
#include <sys/queue.h>
|
||
|
#include <sys/refcount.h>
|
||
|
#include <sys/mutex.h>
|
||
|
#include <sys/selinfo.h>
|
||
|
#include <sys/socket.h>
|
||
|
#include <sys/socketvar.h>
|
||
|
#include <sys/sysctl.h>
|
||
|
#include <sys/tree.h>
|
||
|
#include <sys/uio.h>
|
||
|
#include <machine/atomic.h>
|
||
|
#include <sys/counter.h>
|
||
|
|
||
|
#include <dev/tcp_log/tcp_log_dev.h>
|
||
|
|
||
|
#ifdef TCPLOG_DEBUG_COUNTERS
|
||
|
extern counter_u64_t tcp_log_que_read;
|
||
|
extern counter_u64_t tcp_log_que_freed;
|
||
|
#endif
|
||
|
|
||
|
static struct cdev *tcp_log_dev;
|
||
|
static struct selinfo tcp_log_sel;
|
||
|
|
||
|
static struct log_queueh tcp_log_dev_queue_head = STAILQ_HEAD_INITIALIZER(tcp_log_dev_queue_head);
|
||
|
static struct log_infoh tcp_log_dev_reader_head = STAILQ_HEAD_INITIALIZER(tcp_log_dev_reader_head);
|
||
|
|
||
|
MALLOC_DEFINE(M_TCPLOGDEV, "tcp_log_dev", "TCP log device data structures");
|
||
|
|
||
|
static int tcp_log_dev_listeners = 0;
|
||
|
|
||
|
static struct mtx tcp_log_dev_queue_lock;
|
||
|
|
||
|
#define TCP_LOG_DEV_QUEUE_LOCK() mtx_lock(&tcp_log_dev_queue_lock)
|
||
|
#define TCP_LOG_DEV_QUEUE_UNLOCK() mtx_unlock(&tcp_log_dev_queue_lock)
|
||
|
#define TCP_LOG_DEV_QUEUE_LOCK_ASSERT() mtx_assert(&tcp_log_dev_queue_lock, MA_OWNED)
|
||
|
#define TCP_LOG_DEV_QUEUE_UNLOCK_ASSERT() mtx_assert(&tcp_log_dev_queue_lock, MA_NOTOWNED)
|
||
|
#define TCP_LOG_DEV_QUEUE_REF(tldq) refcount_acquire(&((tldq)->tldq_refcnt))
|
||
|
#define TCP_LOG_DEV_QUEUE_UNREF(tldq) refcount_release(&((tldq)->tldq_refcnt))
|
||
|
|
||
|
static void tcp_log_dev_clear_refcount(struct tcp_log_dev_queue *entry);
|
||
|
static void tcp_log_dev_clear_cdevpriv(void *data);
|
||
|
static int tcp_log_dev_open(struct cdev *dev __unused, int flags,
|
||
|
int devtype __unused, struct thread *td __unused);
|
||
|
static int tcp_log_dev_write(struct cdev *dev __unused,
|
||
|
struct uio *uio __unused, int flags __unused);
|
||
|
static int tcp_log_dev_read(struct cdev *dev __unused, struct uio *uio,
|
||
|
int flags __unused);
|
||
|
static int tcp_log_dev_ioctl(struct cdev *dev __unused, u_long cmd,
|
||
|
caddr_t data, int fflag __unused, struct thread *td __unused);
|
||
|
static int tcp_log_dev_poll(struct cdev *dev __unused, int events,
|
||
|
struct thread *td);
|
||
|
|
||
|
|
||
|
enum tcp_log_dev_queue_lock_state {
|
||
|
QUEUE_UNLOCKED = 0,
|
||
|
QUEUE_LOCKED,
|
||
|
};
|
||
|
|
||
|
static struct cdevsw tcp_log_cdevsw = {
|
||
|
.d_version = D_VERSION,
|
||
|
.d_read = tcp_log_dev_read,
|
||
|
.d_open = tcp_log_dev_open,
|
||
|
.d_write = tcp_log_dev_write,
|
||
|
.d_poll = tcp_log_dev_poll,
|
||
|
.d_ioctl = tcp_log_dev_ioctl,
|
||
|
#ifdef NOTYET
|
||
|
.d_mmap = tcp_log_dev_mmap,
|
||
|
#endif
|
||
|
.d_name = "tcp_log",
|
||
|
};
|
||
|
|
||
|
static __inline void
|
||
|
tcp_log_dev_queue_validate_lock(int lockstate)
|
||
|
{
|
||
|
|
||
|
#ifdef INVARIANTS
|
||
|
switch (lockstate) {
|
||
|
case QUEUE_LOCKED:
|
||
|
TCP_LOG_DEV_QUEUE_LOCK_ASSERT();
|
||
|
break;
|
||
|
case QUEUE_UNLOCKED:
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK_ASSERT();
|
||
|
break;
|
||
|
default:
|
||
|
kassert_panic("%s:%d: unknown queue lock state", __func__,
|
||
|
__LINE__);
|
||
|
}
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Clear the refcount. If appropriate, it will remove the entry from the
|
||
|
* queue and call the destructor.
|
||
|
*
|
||
|
* This must be called with the queue lock held.
|
||
|
*/
|
||
|
static void
|
||
|
tcp_log_dev_clear_refcount(struct tcp_log_dev_queue *entry)
|
||
|
{
|
||
|
|
||
|
KASSERT(entry != NULL, ("%s: called with NULL entry", __func__));
|
||
|
|
||
|
TCP_LOG_DEV_QUEUE_LOCK_ASSERT();
|
||
|
|
||
|
if (TCP_LOG_DEV_QUEUE_UNREF(entry)) {
|
||
|
#ifdef TCPLOG_DEBUG_COUNTERS
|
||
|
counter_u64_add(tcp_log_que_freed, 1);
|
||
|
#endif
|
||
|
/* Remove the entry from the queue and call the destructor. */
|
||
|
STAILQ_REMOVE(&tcp_log_dev_queue_head, entry, tcp_log_dev_queue,
|
||
|
tldq_queue);
|
||
|
(*entry->tldq_dtor)(entry);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
tcp_log_dev_clear_cdevpriv(void *data)
|
||
|
{
|
||
|
struct tcp_log_dev_info *priv;
|
||
|
struct tcp_log_dev_queue *entry, *entry_tmp;
|
||
|
|
||
|
priv = (struct tcp_log_dev_info *)data;
|
||
|
if (priv == NULL)
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* Lock the queue and drop our references. We hold references to all
|
||
|
* the entries starting with tldi_head (or, if tldi_head == NULL, all
|
||
|
* entries in the queue).
|
||
|
*
|
||
|
* Because we don't want anyone adding addition things to the queue
|
||
|
* while we are doing this, we lock the queue.
|
||
|
*/
|
||
|
TCP_LOG_DEV_QUEUE_LOCK();
|
||
|
if (priv->tldi_head != NULL) {
|
||
|
entry = priv->tldi_head;
|
||
|
STAILQ_FOREACH_FROM_SAFE(entry, &tcp_log_dev_queue_head,
|
||
|
tldq_queue, entry_tmp) {
|
||
|
tcp_log_dev_clear_refcount(entry);
|
||
|
}
|
||
|
}
|
||
|
tcp_log_dev_listeners--;
|
||
|
KASSERT(tcp_log_dev_listeners >= 0,
|
||
|
("%s: tcp_log_dev_listeners is unexpectedly negative", __func__));
|
||
|
STAILQ_REMOVE(&tcp_log_dev_reader_head, priv, tcp_log_dev_info,
|
||
|
tldi_list);
|
||
|
TCP_LOG_DEV_QUEUE_LOCK_ASSERT();
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK();
|
||
|
free(priv, M_TCPLOGDEV);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
tcp_log_dev_open(struct cdev *dev __unused, int flags, int devtype __unused,
|
||
|
struct thread *td __unused)
|
||
|
{
|
||
|
struct tcp_log_dev_info *priv;
|
||
|
struct tcp_log_dev_queue *entry;
|
||
|
int rv;
|
||
|
|
||
|
/*
|
||
|
* Ideally, we shouldn't see these because of file system
|
||
|
* permissions.
|
||
|
*/
|
||
|
if (flags & (FWRITE | FEXEC | FAPPEND | O_TRUNC))
|
||
|
return (ENODEV);
|
||
|
|
||
|
/* Allocate space to hold information about where we are. */
|
||
|
priv = malloc(sizeof(struct tcp_log_dev_info), M_TCPLOGDEV,
|
||
|
M_ZERO | M_WAITOK);
|
||
|
|
||
|
/* Stash the private data away. */
|
||
|
rv = devfs_set_cdevpriv((void *)priv, tcp_log_dev_clear_cdevpriv);
|
||
|
if (!rv) {
|
||
|
/*
|
||
|
* Increase the listener count, add this reader to the list, and
|
||
|
* take references on all current queues.
|
||
|
*/
|
||
|
TCP_LOG_DEV_QUEUE_LOCK();
|
||
|
tcp_log_dev_listeners++;
|
||
|
STAILQ_INSERT_HEAD(&tcp_log_dev_reader_head, priv, tldi_list);
|
||
|
priv->tldi_head = STAILQ_FIRST(&tcp_log_dev_queue_head);
|
||
|
if (priv->tldi_head != NULL)
|
||
|
priv->tldi_cur = priv->tldi_head->tldq_buf;
|
||
|
STAILQ_FOREACH(entry, &tcp_log_dev_queue_head, tldq_queue)
|
||
|
TCP_LOG_DEV_QUEUE_REF(entry);
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK();
|
||
|
} else {
|
||
|
/* Free the entry. */
|
||
|
free(priv, M_TCPLOGDEV);
|
||
|
}
|
||
|
return (rv);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
tcp_log_dev_write(struct cdev *dev __unused, struct uio *uio __unused,
|
||
|
int flags __unused)
|
||
|
{
|
||
|
|
||
|
return (ENODEV);
|
||
|
}
|
||
|
|
||
|
static __inline void
|
||
|
tcp_log_dev_rotate_bufs(struct tcp_log_dev_info *priv, int *lockstate)
|
||
|
{
|
||
|
struct tcp_log_dev_queue *entry;
|
||
|
|
||
|
KASSERT(priv->tldi_head != NULL,
|
||
|
("%s:%d: priv->tldi_head unexpectedly NULL",
|
||
|
__func__, __LINE__));
|
||
|
KASSERT(priv->tldi_head->tldq_buf == priv->tldi_cur,
|
||
|
("%s:%d: buffer mismatch (%p vs %p)",
|
||
|
__func__, __LINE__, priv->tldi_head->tldq_buf,
|
||
|
priv->tldi_cur));
|
||
|
tcp_log_dev_queue_validate_lock(*lockstate);
|
||
|
|
||
|
if (*lockstate == QUEUE_UNLOCKED) {
|
||
|
TCP_LOG_DEV_QUEUE_LOCK();
|
||
|
*lockstate = QUEUE_LOCKED;
|
||
|
}
|
||
|
entry = priv->tldi_head;
|
||
|
priv->tldi_head = STAILQ_NEXT(entry, tldq_queue);
|
||
|
tcp_log_dev_clear_refcount(entry);
|
||
|
priv->tldi_cur = NULL;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
tcp_log_dev_read(struct cdev *dev __unused, struct uio *uio, int flags)
|
||
|
{
|
||
|
struct tcp_log_common_header *buf;
|
||
|
struct tcp_log_dev_info *priv;
|
||
|
struct tcp_log_dev_queue *entry;
|
||
|
ssize_t len;
|
||
|
int lockstate, rv;
|
||
|
|
||
|
/* Get our private info. */
|
||
|
rv = devfs_get_cdevpriv((void **)&priv);
|
||
|
if (rv)
|
||
|
return (rv);
|
||
|
|
||
|
lockstate = QUEUE_UNLOCKED;
|
||
|
|
||
|
/* Do we need to get a new buffer? */
|
||
|
while (priv->tldi_cur == NULL ||
|
||
|
priv->tldi_cur->tlch_length <= priv->tldi_off) {
|
||
|
/* Did we somehow forget to rotate? */
|
||
|
KASSERT(priv->tldi_cur == NULL,
|
||
|
("%s:%d: tldi_cur is unexpectedly non-NULL", __func__,
|
||
|
__LINE__));
|
||
|
if (priv->tldi_cur != NULL)
|
||
|
tcp_log_dev_rotate_bufs(priv, &lockstate);
|
||
|
|
||
|
/*
|
||
|
* Before we start looking at tldi_head, we need a lock on the
|
||
|
* queue to make sure tldi_head stays stable.
|
||
|
*/
|
||
|
if (lockstate == QUEUE_UNLOCKED) {
|
||
|
TCP_LOG_DEV_QUEUE_LOCK();
|
||
|
lockstate = QUEUE_LOCKED;
|
||
|
}
|
||
|
|
||
|
/* We need the next buffer. Do we have one? */
|
||
|
if (priv->tldi_head == NULL && (flags & FNONBLOCK)) {
|
||
|
rv = EAGAIN;
|
||
|
goto done;
|
||
|
}
|
||
|
if (priv->tldi_head == NULL) {
|
||
|
/* Sleep and wait for more things we can read. */
|
||
|
rv = mtx_sleep(&tcp_log_dev_listeners,
|
||
|
&tcp_log_dev_queue_lock, PCATCH, "tcplogdev", 0);
|
||
|
if (rv)
|
||
|
goto done;
|
||
|
if (priv->tldi_head == NULL)
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We have an entry to read. We want to try to create a
|
||
|
* buffer, if one doesn't already exist.
|
||
|
*/
|
||
|
entry = priv->tldi_head;
|
||
|
if (entry->tldq_buf == NULL) {
|
||
|
TCP_LOG_DEV_QUEUE_LOCK_ASSERT();
|
||
|
buf = (*entry->tldq_xform)(entry);
|
||
|
if (buf == NULL) {
|
||
|
rv = EBUSY;
|
||
|
goto done;
|
||
|
}
|
||
|
entry->tldq_buf = buf;
|
||
|
}
|
||
|
|
||
|
priv->tldi_cur = entry->tldq_buf;
|
||
|
priv->tldi_off = 0;
|
||
|
}
|
||
|
|
||
|
/* Copy what we can from this buffer to the output buffer. */
|
||
|
if (uio->uio_resid > 0) {
|
||
|
/* Drop locks so we can take page faults. */
|
||
|
if (lockstate == QUEUE_LOCKED)
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK();
|
||
|
lockstate = QUEUE_UNLOCKED;
|
||
|
|
||
|
KASSERT(priv->tldi_cur != NULL,
|
||
|
("%s: priv->tldi_cur is unexpectedly NULL", __func__));
|
||
|
|
||
|
/* Copy as much as we can to this uio. */
|
||
|
len = priv->tldi_cur->tlch_length - priv->tldi_off;
|
||
|
if (len > uio->uio_resid)
|
||
|
len = uio->uio_resid;
|
||
|
rv = uiomove(((uint8_t *)priv->tldi_cur) + priv->tldi_off,
|
||
|
len, uio);
|
||
|
if (rv != 0)
|
||
|
goto done;
|
||
|
priv->tldi_off += len;
|
||
|
#ifdef TCPLOG_DEBUG_COUNTERS
|
||
|
counter_u64_add(tcp_log_que_read, len);
|
||
|
#endif
|
||
|
}
|
||
|
/* Are we done with this buffer? If so, find the next one. */
|
||
|
if (priv->tldi_off >= priv->tldi_cur->tlch_length) {
|
||
|
KASSERT(priv->tldi_off == priv->tldi_cur->tlch_length,
|
||
|
("%s: offset (%ju) exceeds length (%ju)", __func__,
|
||
|
(uintmax_t)priv->tldi_off,
|
||
|
(uintmax_t)priv->tldi_cur->tlch_length));
|
||
|
tcp_log_dev_rotate_bufs(priv, &lockstate);
|
||
|
}
|
||
|
done:
|
||
|
tcp_log_dev_queue_validate_lock(lockstate);
|
||
|
if (lockstate == QUEUE_LOCKED)
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK();
|
||
|
return (rv);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
tcp_log_dev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
|
||
|
int fflag __unused, struct thread *td __unused)
|
||
|
{
|
||
|
struct tcp_log_dev_info *priv;
|
||
|
int rv;
|
||
|
|
||
|
/* Get our private info. */
|
||
|
rv = devfs_get_cdevpriv((void **)&priv);
|
||
|
if (rv)
|
||
|
return (rv);
|
||
|
|
||
|
/*
|
||
|
* Set things. Here, we are most concerned about the non-blocking I/O
|
||
|
* flag.
|
||
|
*/
|
||
|
rv = 0;
|
||
|
switch (cmd) {
|
||
|
case FIONBIO:
|
||
|
break;
|
||
|
case FIOASYNC:
|
||
|
if (*(int *)data != 0)
|
||
|
rv = EINVAL;
|
||
|
break;
|
||
|
default:
|
||
|
rv = ENOIOCTL;
|
||
|
}
|
||
|
return (rv);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
tcp_log_dev_poll(struct cdev *dev __unused, int events, struct thread *td)
|
||
|
{
|
||
|
struct tcp_log_dev_info *priv;
|
||
|
int revents;
|
||
|
|
||
|
/*
|
||
|
* Get our private info. If this fails, claim that all events are
|
||
|
* ready. That should prod the user to do something that will
|
||
|
* make the error evident to them.
|
||
|
*/
|
||
|
if (devfs_get_cdevpriv((void **)&priv))
|
||
|
return (events);
|
||
|
|
||
|
revents = 0;
|
||
|
if (events & (POLLIN | POLLRDNORM)) {
|
||
|
/*
|
||
|
* We can (probably) read right now if we are partway through
|
||
|
* a buffer or if we are just about to start a buffer.
|
||
|
* Because we are going to read tldi_head, we should acquire
|
||
|
* a read lock on the queue.
|
||
|
*/
|
||
|
TCP_LOG_DEV_QUEUE_LOCK();
|
||
|
if ((priv->tldi_head != NULL && priv->tldi_cur == NULL) ||
|
||
|
(priv->tldi_cur != NULL &&
|
||
|
priv->tldi_off < priv->tldi_cur->tlch_length))
|
||
|
revents = events & (POLLIN | POLLRDNORM);
|
||
|
else
|
||
|
selrecord(td, &tcp_log_sel);
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK();
|
||
|
} else {
|
||
|
/*
|
||
|
* It only makes sense to poll for reading. So, again, prod the
|
||
|
* user to do something that will make the error of their ways
|
||
|
* apparent.
|
||
|
*/
|
||
|
revents = events;
|
||
|
}
|
||
|
return (revents);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
tcp_log_dev_add_log(struct tcp_log_dev_queue *entry)
|
||
|
{
|
||
|
struct tcp_log_dev_info *priv;
|
||
|
int rv;
|
||
|
bool wakeup_needed;
|
||
|
|
||
|
KASSERT(entry->tldq_buf != NULL || entry->tldq_xform != NULL,
|
||
|
("%s: Called with both tldq_buf and tldq_xform set to NULL",
|
||
|
__func__));
|
||
|
KASSERT(entry->tldq_dtor != NULL,
|
||
|
("%s: Called with tldq_dtor set to NULL", __func__));
|
||
|
|
||
|
/* Get a lock on the queue. */
|
||
|
TCP_LOG_DEV_QUEUE_LOCK();
|
||
|
|
||
|
/* If no one is listening, tell the caller to free the resources. */
|
||
|
if (tcp_log_dev_listeners == 0) {
|
||
|
rv = ENXIO;
|
||
|
goto done;
|
||
|
}
|
||
|
|
||
|
/* Add this to the end of the tailq. */
|
||
|
STAILQ_INSERT_TAIL(&tcp_log_dev_queue_head, entry, tldq_queue);
|
||
|
|
||
|
/* Add references for all current listeners. */
|
||
|
refcount_init(&entry->tldq_refcnt, tcp_log_dev_listeners);
|
||
|
|
||
|
/*
|
||
|
* If any listener is currently stuck on NULL, that means they are
|
||
|
* waiting. Point their head to this new entry.
|
||
|
*/
|
||
|
wakeup_needed = false;
|
||
|
STAILQ_FOREACH(priv, &tcp_log_dev_reader_head, tldi_list)
|
||
|
if (priv->tldi_head == NULL) {
|
||
|
priv->tldi_head = entry;
|
||
|
wakeup_needed = true;
|
||
|
}
|
||
|
|
||
|
if (wakeup_needed) {
|
||
|
selwakeup(&tcp_log_sel);
|
||
|
wakeup(&tcp_log_dev_listeners);
|
||
|
}
|
||
|
|
||
|
rv = 0;
|
||
|
|
||
|
done:
|
||
|
TCP_LOG_DEV_QUEUE_LOCK_ASSERT();
|
||
|
TCP_LOG_DEV_QUEUE_UNLOCK();
|
||
|
return (rv);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
tcp_log_dev_modevent(module_t mod __unused, int type, void *data __unused)
|
||
|
{
|
||
|
|
||
|
/* TODO: Support intelligent unloading. */
|
||
|
switch (type) {
|
||
|
case MOD_LOAD:
|
||
|
if (bootverbose)
|
||
|
printf("tcp_log: tcp_log device\n");
|
||
|
memset(&tcp_log_sel, 0, sizeof(tcp_log_sel));
|
||
|
memset(&tcp_log_dev_queue_lock, 0, sizeof(struct mtx));
|
||
|
mtx_init(&tcp_log_dev_queue_lock, "tcp_log dev",
|
||
|
"tcp_log device queues", MTX_DEF);
|
||
|
tcp_log_dev = make_dev_credf(MAKEDEV_ETERNAL_KLD,
|
||
|
&tcp_log_cdevsw, 0, NULL, UID_ROOT, GID_WHEEL, 0400,
|
||
|
"tcp_log");
|
||
|
break;
|
||
|
default:
|
||
|
return (EOPNOTSUPP);
|
||
|
}
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
DEV_MODULE(tcp_log_dev, tcp_log_dev_modevent, NULL);
|
||
|
MODULE_VERSION(tcp_log_dev, 1);
|