// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* linux/net/netfilter/xt_IDLETIMER.c
|
*
|
* Netfilter module to trigger a timer when packet matches.
|
* After timer expires a kevent will be sent.
|
*
|
* Copyright (C) 2004, 2010 Nokia Corporation
|
* Written by Timo Teras <ext-timo.teras@nokia.com>
|
*
|
* Converted to x_tables and reworked for upstream inclusion
|
* by Luciano Coelho <luciano.coelho@nokia.com>
|
*
|
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#include <linux/module.h>
|
#include <linux/timer.h>
|
#include <linux/alarmtimer.h>
|
#include <linux/list.h>
|
#include <linux/mutex.h>
|
#include <linux/netfilter.h>
|
#include <linux/netfilter/x_tables.h>
|
#include <linux/netfilter/xt_IDLETIMER.h>
|
#include <linux/kdev_t.h>
|
#include <linux/kobject.h>
|
#include <linux/workqueue.h>
|
#include <linux/sysfs.h>
|
#include <linux/suspend.h>
|
#include <net/sock.h>
|
#include <net/inet_sock.h>
|
|
#define NLMSG_MAX_SIZE 64
|
|
struct idletimer_tg {
|
struct list_head entry;
|
struct alarm alarm;
|
struct timer_list timer;
|
struct work_struct work;
|
|
struct kobject *kobj;
|
struct device_attribute attr;
|
|
struct timespec64 delayed_timer_trigger;
|
struct timespec64 last_modified_timer;
|
struct timespec64 last_suspend_time;
|
struct notifier_block pm_nb;
|
|
int timeout;
|
unsigned int refcnt;
|
u8 timer_type;
|
|
bool work_pending;
|
bool send_nl_msg;
|
bool active;
|
uid_t uid;
|
bool suspend_time_valid;
|
};
|
|
static LIST_HEAD(idletimer_tg_list);
|
static DEFINE_MUTEX(list_mutex);
|
static DEFINE_SPINLOCK(timestamp_lock);
|
|
static struct kobject *idletimer_tg_kobj;
|
|
static bool check_for_delayed_trigger(struct idletimer_tg *timer,
|
struct timespec64 *ts)
|
{
|
bool state;
|
struct timespec64 temp;
|
spin_lock_bh(×tamp_lock);
|
timer->work_pending = false;
|
if ((ts->tv_sec - timer->last_modified_timer.tv_sec) > timer->timeout ||
|
timer->delayed_timer_trigger.tv_sec != 0) {
|
state = false;
|
temp.tv_sec = timer->timeout;
|
temp.tv_nsec = 0;
|
if (timer->delayed_timer_trigger.tv_sec != 0) {
|
temp = timespec64_add(timer->delayed_timer_trigger,
|
temp);
|
ts->tv_sec = temp.tv_sec;
|
ts->tv_nsec = temp.tv_nsec;
|
timer->delayed_timer_trigger.tv_sec = 0;
|
timer->work_pending = true;
|
schedule_work(&timer->work);
|
} else {
|
temp = timespec64_add(timer->last_modified_timer, temp);
|
ts->tv_sec = temp.tv_sec;
|
ts->tv_nsec = temp.tv_nsec;
|
}
|
} else {
|
state = timer->active;
|
}
|
spin_unlock_bh(×tamp_lock);
|
return state;
|
}
|
|
static void notify_netlink_uevent(const char *iface, struct idletimer_tg *timer)
|
{
|
char iface_msg[NLMSG_MAX_SIZE];
|
char state_msg[NLMSG_MAX_SIZE];
|
char timestamp_msg[NLMSG_MAX_SIZE];
|
char uid_msg[NLMSG_MAX_SIZE];
|
char *envp[] = { iface_msg, state_msg, timestamp_msg, uid_msg, NULL };
|
int res;
|
struct timespec64 ts;
|
u64 time_ns;
|
bool state;
|
|
res = snprintf(iface_msg, NLMSG_MAX_SIZE, "INTERFACE=%s",
|
iface);
|
if (NLMSG_MAX_SIZE <= res) {
|
pr_err("message too long (%d)\n", res);
|
return;
|
}
|
|
ts = ktime_to_timespec64(ktime_get_boottime());
|
state = check_for_delayed_trigger(timer, &ts);
|
res = snprintf(state_msg, NLMSG_MAX_SIZE, "STATE=%s",
|
state ? "active" : "inactive");
|
|
if (NLMSG_MAX_SIZE <= res) {
|
pr_err("message too long (%d)\n", res);
|
return;
|
}
|
|
if (state) {
|
res = snprintf(uid_msg, NLMSG_MAX_SIZE, "UID=%u", timer->uid);
|
if (NLMSG_MAX_SIZE <= res)
|
pr_err("message too long (%d)\n", res);
|
} else {
|
res = snprintf(uid_msg, NLMSG_MAX_SIZE, "UID=");
|
if (NLMSG_MAX_SIZE <= res)
|
pr_err("message too long (%d)\n", res);
|
}
|
|
time_ns = timespec64_to_ns(&ts);
|
res = snprintf(timestamp_msg, NLMSG_MAX_SIZE, "TIME_NS=%llu", time_ns);
|
if (NLMSG_MAX_SIZE <= res) {
|
timestamp_msg[0] = '\0';
|
pr_err("message too long (%d)\n", res);
|
}
|
|
pr_debug("putting nlmsg: <%s> <%s> <%s> <%s>\n", iface_msg, state_msg,
|
timestamp_msg, uid_msg);
|
kobject_uevent_env(idletimer_tg_kobj, KOBJ_CHANGE, envp);
|
return;
|
}
|
|
static
|
struct idletimer_tg *__idletimer_tg_find_by_label(const char *label)
|
{
|
struct idletimer_tg *entry;
|
|
list_for_each_entry(entry, &idletimer_tg_list, entry) {
|
if (!strcmp(label, entry->attr.attr.name))
|
return entry;
|
}
|
|
return NULL;
|
}
|
|
static ssize_t idletimer_tg_show(struct device *dev,
|
struct device_attribute *attr, char *buf)
|
{
|
struct idletimer_tg *timer;
|
unsigned long expires = 0;
|
struct timespec64 ktimespec = {};
|
long time_diff = 0;
|
unsigned long now = jiffies;
|
|
mutex_lock(&list_mutex);
|
|
timer = __idletimer_tg_find_by_label(attr->attr.name);
|
if (timer) {
|
if (timer->timer_type & XT_IDLETIMER_ALARM) {
|
ktime_t expires_alarm = alarm_expires_remaining(&timer->alarm);
|
ktimespec = ktime_to_timespec64(expires_alarm);
|
time_diff = ktimespec.tv_sec;
|
} else {
|
expires = timer->timer.expires;
|
time_diff = jiffies_to_msecs(expires - now) / 1000;
|
}
|
}
|
|
mutex_unlock(&list_mutex);
|
|
if (time_after(expires, now) || ktimespec.tv_sec > 0)
|
return scnprintf(buf, PAGE_SIZE, "%ld\n", time_diff);
|
|
if (timer->send_nl_msg)
|
return scnprintf(buf, PAGE_SIZE, "0 %d\n",
|
jiffies_to_msecs(now - expires) / 1000);
|
|
return scnprintf(buf, PAGE_SIZE, "0\n");
|
}
|
|
static void idletimer_tg_work(struct work_struct *work)
|
{
|
struct idletimer_tg *timer = container_of(work, struct idletimer_tg,
|
work);
|
|
sysfs_notify(idletimer_tg_kobj, NULL, timer->attr.attr.name);
|
|
if (timer->send_nl_msg)
|
notify_netlink_uevent(timer->attr.attr.name, timer);
|
}
|
|
static void idletimer_tg_expired(struct timer_list *t)
|
{
|
struct idletimer_tg *timer = from_timer(timer, t, timer);
|
|
pr_debug("timer %s expired\n", timer->attr.attr.name);
|
|
spin_lock_bh(×tamp_lock);
|
timer->active = false;
|
timer->work_pending = true;
|
schedule_work(&timer->work);
|
spin_unlock_bh(×tamp_lock);
|
}
|
|
static int idletimer_resume(struct notifier_block *notifier,
|
unsigned long pm_event, void *unused)
|
{
|
struct timespec64 ts;
|
unsigned long time_diff, now = jiffies;
|
struct idletimer_tg *timer = container_of(notifier,
|
struct idletimer_tg, pm_nb);
|
if (!timer)
|
return NOTIFY_DONE;
|
|
switch (pm_event) {
|
case PM_SUSPEND_PREPARE:
|
timer->last_suspend_time =
|
ktime_to_timespec64(ktime_get_boottime());
|
timer->suspend_time_valid = true;
|
break;
|
case PM_POST_SUSPEND:
|
if (!timer->suspend_time_valid)
|
break;
|
timer->suspend_time_valid = false;
|
|
spin_lock_bh(×tamp_lock);
|
if (!timer->active) {
|
spin_unlock_bh(×tamp_lock);
|
break;
|
}
|
/* since jiffies are not updated when suspended now represents
|
* the time it would have suspended */
|
if (time_after(timer->timer.expires, now)) {
|
ts = ktime_to_timespec64(ktime_get_boottime());
|
ts = timespec64_sub(ts, timer->last_suspend_time);
|
time_diff = timespec64_to_jiffies(&ts);
|
if (timer->timer.expires > (time_diff + now)) {
|
mod_timer_pending(&timer->timer,
|
(timer->timer.expires - time_diff));
|
} else {
|
del_timer(&timer->timer);
|
timer->timer.expires = 0;
|
timer->active = false;
|
timer->work_pending = true;
|
schedule_work(&timer->work);
|
}
|
}
|
spin_unlock_bh(×tamp_lock);
|
break;
|
default:
|
break;
|
}
|
return NOTIFY_DONE;
|
}
|
|
static enum alarmtimer_restart idletimer_tg_alarmproc(struct alarm *alarm,
|
ktime_t now)
|
{
|
struct idletimer_tg *timer = alarm->data;
|
|
pr_debug("alarm %s expired\n", timer->attr.attr.name);
|
schedule_work(&timer->work);
|
return ALARMTIMER_NORESTART;
|
}
|
|
static int idletimer_check_sysfs_name(const char *name, unsigned int size)
|
{
|
int ret;
|
|
ret = xt_check_proc_name(name, size);
|
if (ret < 0)
|
return ret;
|
|
if (!strcmp(name, "power") ||
|
!strcmp(name, "subsystem") ||
|
!strcmp(name, "uevent"))
|
return -EINVAL;
|
|
return 0;
|
}
|
|
static int idletimer_tg_create(struct idletimer_tg_info *info)
|
{
|
int ret;
|
|
info->timer = kzalloc(sizeof(*info->timer), GFP_KERNEL);
|
if (!info->timer) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
ret = idletimer_check_sysfs_name(info->label, sizeof(info->label));
|
if (ret < 0)
|
goto out_free_timer;
|
|
sysfs_attr_init(&info->timer->attr.attr);
|
info->timer->attr.attr.name = kstrdup(info->label, GFP_KERNEL);
|
if (!info->timer->attr.attr.name) {
|
ret = -ENOMEM;
|
goto out_free_timer;
|
}
|
info->timer->attr.attr.mode = 0444;
|
info->timer->attr.show = idletimer_tg_show;
|
|
ret = sysfs_create_file(idletimer_tg_kobj, &info->timer->attr.attr);
|
if (ret < 0) {
|
pr_debug("couldn't add file to sysfs\n");
|
goto out_free_attr;
|
}
|
|
list_add(&info->timer->entry, &idletimer_tg_list);
|
pr_debug("timer type value is 0.\n");
|
info->timer->timer_type = 0;
|
info->timer->refcnt = 1;
|
info->timer->send_nl_msg = false;
|
info->timer->active = true;
|
info->timer->timeout = info->timeout;
|
|
info->timer->delayed_timer_trigger.tv_sec = 0;
|
info->timer->delayed_timer_trigger.tv_nsec = 0;
|
info->timer->work_pending = false;
|
info->timer->uid = 0;
|
info->timer->last_modified_timer =
|
ktime_to_timespec64(ktime_get_boottime());
|
|
info->timer->pm_nb.notifier_call = idletimer_resume;
|
ret = register_pm_notifier(&info->timer->pm_nb);
|
if (ret)
|
printk(KERN_WARNING "[%s] Failed to register pm notifier %d\n",
|
__func__, ret);
|
|
INIT_WORK(&info->timer->work, idletimer_tg_work);
|
|
timer_setup(&info->timer->timer, idletimer_tg_expired, 0);
|
mod_timer(&info->timer->timer,
|
msecs_to_jiffies(info->timeout * 1000) + jiffies);
|
|
return 0;
|
|
out_free_attr:
|
kfree(info->timer->attr.attr.name);
|
out_free_timer:
|
kfree(info->timer);
|
out:
|
return ret;
|
}
|
|
static int idletimer_tg_create_v1(struct idletimer_tg_info_v1 *info)
|
{
|
int ret;
|
|
info->timer = kzalloc(sizeof(*info->timer), GFP_KERNEL);
|
if (!info->timer) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
ret = idletimer_check_sysfs_name(info->label, sizeof(info->label));
|
if (ret < 0)
|
goto out_free_timer;
|
|
sysfs_attr_init(&info->timer->attr.attr);
|
info->timer->attr.attr.name = kstrdup(info->label, GFP_KERNEL);
|
if (!info->timer->attr.attr.name) {
|
ret = -ENOMEM;
|
goto out_free_timer;
|
}
|
info->timer->attr.attr.mode = 0444;
|
info->timer->attr.show = idletimer_tg_show;
|
|
ret = sysfs_create_file(idletimer_tg_kobj, &info->timer->attr.attr);
|
if (ret < 0) {
|
pr_debug("couldn't add file to sysfs\n");
|
goto out_free_attr;
|
}
|
|
/* notify userspace */
|
kobject_uevent(idletimer_tg_kobj,KOBJ_ADD);
|
|
list_add(&info->timer->entry, &idletimer_tg_list);
|
pr_debug("timer type value is %u\n", info->timer_type);
|
info->timer->timer_type = info->timer_type;
|
info->timer->refcnt = 1;
|
info->timer->send_nl_msg = (info->send_nl_msg != 0);
|
info->timer->active = true;
|
info->timer->timeout = info->timeout;
|
|
info->timer->delayed_timer_trigger.tv_sec = 0;
|
info->timer->delayed_timer_trigger.tv_nsec = 0;
|
info->timer->work_pending = false;
|
info->timer->uid = 0;
|
info->timer->last_modified_timer =
|
ktime_to_timespec64(ktime_get_boottime());
|
|
info->timer->pm_nb.notifier_call = idletimer_resume;
|
ret = register_pm_notifier(&info->timer->pm_nb);
|
if (ret)
|
printk(KERN_WARNING "[%s] Failed to register pm notifier %d\n",
|
__func__, ret);
|
|
INIT_WORK(&info->timer->work, idletimer_tg_work);
|
|
if (info->timer->timer_type & XT_IDLETIMER_ALARM) {
|
ktime_t tout;
|
alarm_init(&info->timer->alarm, ALARM_BOOTTIME,
|
idletimer_tg_alarmproc);
|
info->timer->alarm.data = info->timer;
|
tout = ktime_set(info->timeout, 0);
|
alarm_start_relative(&info->timer->alarm, tout);
|
} else {
|
timer_setup(&info->timer->timer, idletimer_tg_expired, 0);
|
mod_timer(&info->timer->timer,
|
msecs_to_jiffies(info->timeout * 1000) + jiffies);
|
}
|
|
return 0;
|
|
out_free_attr:
|
kfree(info->timer->attr.attr.name);
|
out_free_timer:
|
kfree(info->timer);
|
out:
|
return ret;
|
}
|
|
static void reset_timer(struct idletimer_tg * const info_timer,
|
const __u32 info_timeout,
|
struct sk_buff *skb)
|
{
|
unsigned long now = jiffies;
|
bool timer_prev;
|
|
spin_lock_bh(×tamp_lock);
|
timer_prev = info_timer->active;
|
info_timer->active = true;
|
/* timer_prev is used to guard overflow problem in time_before*/
|
if (!timer_prev || time_before(info_timer->timer.expires, now)) {
|
pr_debug("Starting Checkentry timer (Expired, Jiffies): %lu, %lu\n",
|
info_timer->timer.expires, now);
|
|
/* Stores the uid resposible for waking up the radio */
|
if (skb && (skb->sk)) {
|
info_timer->uid = from_kuid_munged(current_user_ns(),
|
sock_i_uid(skb_to_full_sk(skb)));
|
}
|
|
/* checks if there is a pending inactive notification*/
|
if (info_timer->work_pending)
|
info_timer->delayed_timer_trigger = info_timer->last_modified_timer;
|
else {
|
info_timer->work_pending = true;
|
schedule_work(&info_timer->work);
|
}
|
}
|
|
info_timer->last_modified_timer = ktime_to_timespec64(ktime_get_boottime());
|
mod_timer(&info_timer->timer, msecs_to_jiffies(info_timeout * 1000) + now);
|
spin_unlock_bh(×tamp_lock);
|
}
|
|
/*
|
* The actual xt_tables plugin.
|
*/
|
static unsigned int idletimer_tg_target(struct sk_buff *skb,
|
const struct xt_action_param *par)
|
{
|
const struct idletimer_tg_info *info = par->targinfo;
|
unsigned long now = jiffies;
|
|
pr_debug("resetting timer %s, timeout period %u\n",
|
info->label, info->timeout);
|
|
info->timer->active = true;
|
|
if (time_before(info->timer->timer.expires, now)) {
|
schedule_work(&info->timer->work);
|
pr_debug("Starting timer %s (Expired, Jiffies): %lu, %lu\n",
|
info->label, info->timer->timer.expires, now);
|
}
|
|
/* TODO: Avoid modifying timers on each packet */
|
reset_timer(info->timer, info->timeout, skb);
|
|
return XT_CONTINUE;
|
}
|
|
/*
|
* The actual xt_tables plugin.
|
*/
|
static unsigned int idletimer_tg_target_v1(struct sk_buff *skb,
|
const struct xt_action_param *par)
|
{
|
const struct idletimer_tg_info_v1 *info = par->targinfo;
|
unsigned long now = jiffies;
|
|
pr_debug("resetting timer %s, timeout period %u\n",
|
info->label, info->timeout);
|
|
if (info->timer->timer_type & XT_IDLETIMER_ALARM) {
|
ktime_t tout = ktime_set(info->timeout, 0);
|
alarm_start_relative(&info->timer->alarm, tout);
|
} else {
|
info->timer->active = true;
|
|
if (time_before(info->timer->timer.expires, now)) {
|
schedule_work(&info->timer->work);
|
pr_debug("Starting timer %s (Expired, Jiffies): %lu, %lu\n",
|
info->label, info->timer->timer.expires, now);
|
}
|
|
/* TODO: Avoid modifying timers on each packet */
|
reset_timer(info->timer, info->timeout, skb);
|
}
|
|
return XT_CONTINUE;
|
}
|
|
static int idletimer_tg_helper(struct idletimer_tg_info *info)
|
{
|
if (info->timeout == 0) {
|
pr_debug("timeout value is zero\n");
|
return -EINVAL;
|
}
|
if (info->timeout >= INT_MAX / 1000) {
|
pr_debug("timeout value is too big\n");
|
return -EINVAL;
|
}
|
if (info->label[0] == '\0' ||
|
strnlen(info->label,
|
MAX_IDLETIMER_LABEL_SIZE) == MAX_IDLETIMER_LABEL_SIZE) {
|
pr_debug("label is empty or not nul-terminated\n");
|
return -EINVAL;
|
}
|
return 0;
|
}
|
|
|
static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
|
{
|
struct idletimer_tg_info *info = par->targinfo;
|
int ret;
|
|
pr_debug("checkentry targinfo%s\n", info->label);
|
|
ret = idletimer_tg_helper(info);
|
if(ret < 0)
|
{
|
pr_debug("checkentry helper return invalid\n");
|
return -EINVAL;
|
}
|
mutex_lock(&list_mutex);
|
|
info->timer = __idletimer_tg_find_by_label(info->label);
|
if (info->timer) {
|
info->timer->refcnt++;
|
reset_timer(info->timer, info->timeout, NULL);
|
pr_debug("increased refcnt of timer %s to %u\n",
|
info->label, info->timer->refcnt);
|
} else {
|
ret = idletimer_tg_create(info);
|
if (ret < 0) {
|
pr_debug("failed to create timer\n");
|
mutex_unlock(&list_mutex);
|
return ret;
|
}
|
}
|
|
mutex_unlock(&list_mutex);
|
return 0;
|
}
|
|
static int idletimer_tg_checkentry_v1(const struct xt_tgchk_param *par)
|
{
|
struct idletimer_tg_info_v1 *info = par->targinfo;
|
int ret;
|
|
pr_debug("checkentry targinfo%s\n", info->label);
|
|
ret = idletimer_tg_helper((struct idletimer_tg_info *)info);
|
if(ret < 0)
|
{
|
pr_debug("checkentry helper return invalid\n");
|
return -EINVAL;
|
}
|
|
if (info->timer_type > XT_IDLETIMER_ALARM) {
|
pr_debug("invalid value for timer type\n");
|
return -EINVAL;
|
}
|
|
if (info->send_nl_msg > 1) {
|
pr_debug("invalid value for send_nl_msg\n");
|
return -EINVAL;
|
}
|
|
mutex_lock(&list_mutex);
|
|
info->timer = __idletimer_tg_find_by_label(info->label);
|
if (info->timer) {
|
if (info->timer->timer_type != info->timer_type) {
|
pr_debug("Adding/Replacing rule with same label and different timer type is not allowed\n");
|
mutex_unlock(&list_mutex);
|
return -EINVAL;
|
}
|
|
info->timer->refcnt++;
|
if (info->timer_type & XT_IDLETIMER_ALARM) {
|
/* calculate remaining expiry time */
|
ktime_t tout = alarm_expires_remaining(&info->timer->alarm);
|
struct timespec64 ktimespec = ktime_to_timespec64(tout);
|
|
if (ktimespec.tv_sec > 0) {
|
pr_debug("time_expiry_remaining %lld\n",
|
ktimespec.tv_sec);
|
alarm_start_relative(&info->timer->alarm, tout);
|
}
|
} else {
|
reset_timer(info->timer, info->timeout, NULL);
|
}
|
pr_debug("increased refcnt of timer %s to %u\n",
|
info->label, info->timer->refcnt);
|
} else {
|
ret = idletimer_tg_create_v1(info);
|
if (ret < 0) {
|
pr_debug("failed to create timer\n");
|
mutex_unlock(&list_mutex);
|
return ret;
|
}
|
}
|
|
mutex_unlock(&list_mutex);
|
return 0;
|
}
|
|
static void idletimer_tg_destroy(const struct xt_tgdtor_param *par)
|
{
|
const struct idletimer_tg_info *info = par->targinfo;
|
|
pr_debug("destroy targinfo %s\n", info->label);
|
|
mutex_lock(&list_mutex);
|
|
if (--info->timer->refcnt == 0) {
|
pr_debug("deleting timer %s\n", info->label);
|
|
list_del(&info->timer->entry);
|
del_timer_sync(&info->timer->timer);
|
sysfs_remove_file(idletimer_tg_kobj, &info->timer->attr.attr);
|
unregister_pm_notifier(&info->timer->pm_nb);
|
cancel_work_sync(&info->timer->work);
|
kfree(info->timer->attr.attr.name);
|
kfree(info->timer);
|
} else {
|
pr_debug("decreased refcnt of timer %s to %u\n",
|
info->label, info->timer->refcnt);
|
}
|
|
mutex_unlock(&list_mutex);
|
}
|
|
static void idletimer_tg_destroy_v1(const struct xt_tgdtor_param *par)
|
{
|
const struct idletimer_tg_info_v1 *info = par->targinfo;
|
|
pr_debug("destroy targinfo %s\n", info->label);
|
|
mutex_lock(&list_mutex);
|
|
if (--info->timer->refcnt == 0) {
|
pr_debug("deleting timer %s\n", info->label);
|
|
list_del(&info->timer->entry);
|
if (info->timer->timer_type & XT_IDLETIMER_ALARM) {
|
alarm_cancel(&info->timer->alarm);
|
} else {
|
del_timer_sync(&info->timer->timer);
|
}
|
sysfs_remove_file(idletimer_tg_kobj, &info->timer->attr.attr);
|
unregister_pm_notifier(&info->timer->pm_nb);
|
cancel_work_sync(&info->timer->work);
|
kfree(info->timer->attr.attr.name);
|
kfree(info->timer);
|
} else {
|
pr_debug("decreased refcnt of timer %s to %u\n",
|
info->label, info->timer->refcnt);
|
}
|
|
mutex_unlock(&list_mutex);
|
}
|
|
|
static struct xt_target idletimer_tg[] __read_mostly = {
|
{
|
.name = "IDLETIMER",
|
.family = NFPROTO_UNSPEC,
|
.target = idletimer_tg_target,
|
.targetsize = sizeof(struct idletimer_tg_info),
|
.usersize = offsetof(struct idletimer_tg_info, timer),
|
.checkentry = idletimer_tg_checkentry,
|
.destroy = idletimer_tg_destroy,
|
.me = THIS_MODULE,
|
},
|
{
|
.name = "IDLETIMER",
|
.family = NFPROTO_UNSPEC,
|
.revision = 1,
|
.target = idletimer_tg_target_v1,
|
.targetsize = sizeof(struct idletimer_tg_info_v1),
|
.usersize = offsetof(struct idletimer_tg_info_v1, timer),
|
.checkentry = idletimer_tg_checkentry_v1,
|
.destroy = idletimer_tg_destroy_v1,
|
.me = THIS_MODULE,
|
},
|
|
|
};
|
|
static struct class *idletimer_tg_class;
|
|
static struct device *idletimer_tg_device;
|
|
static int __init idletimer_tg_init(void)
|
{
|
int err;
|
|
idletimer_tg_class = class_create(THIS_MODULE, "xt_idletimer");
|
err = PTR_ERR(idletimer_tg_class);
|
if (IS_ERR(idletimer_tg_class)) {
|
pr_debug("couldn't register device class\n");
|
goto out;
|
}
|
|
idletimer_tg_device = device_create(idletimer_tg_class, NULL,
|
MKDEV(0, 0), NULL, "timers");
|
err = PTR_ERR(idletimer_tg_device);
|
if (IS_ERR(idletimer_tg_device)) {
|
pr_debug("couldn't register system device\n");
|
goto out_class;
|
}
|
|
idletimer_tg_kobj = &idletimer_tg_device->kobj;
|
|
err = xt_register_targets(idletimer_tg, ARRAY_SIZE(idletimer_tg));
|
|
if (err < 0) {
|
pr_debug("couldn't register xt target\n");
|
goto out_dev;
|
}
|
|
return 0;
|
out_dev:
|
device_destroy(idletimer_tg_class, MKDEV(0, 0));
|
out_class:
|
class_destroy(idletimer_tg_class);
|
out:
|
return err;
|
}
|
|
static void __exit idletimer_tg_exit(void)
|
{
|
xt_unregister_targets(idletimer_tg, ARRAY_SIZE(idletimer_tg));
|
|
device_destroy(idletimer_tg_class, MKDEV(0, 0));
|
class_destroy(idletimer_tg_class);
|
}
|
|
module_init(idletimer_tg_init);
|
module_exit(idletimer_tg_exit);
|
|
MODULE_AUTHOR("Timo Teras <ext-timo.teras@nokia.com>");
|
MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
|
MODULE_DESCRIPTION("Xtables: idle time monitor");
|
MODULE_LICENSE("GPL v2");
|
MODULE_ALIAS("ipt_IDLETIMER");
|
MODULE_ALIAS("ip6t_IDLETIMER");
|
MODULE_ALIAS("arpt_IDLETIMER");
|
