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- // 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");
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