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Date: Sun, 21 Apr 2013 11:53:14 +0200
From: dmitry pervushin <dmitry.pervushin@...aro.org>
To: netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: patches@...aro.org, dmitry pervushin <dmitry.pervushin@...aro.org>,
JP Abgrall <jpa@...gle.com>,
Ashish Sharma <ashishsharma@...gle.com>,
Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
John Stultz <john.stultz@...aro.org>
Subject: [PATCH 2/2] netfilter: idletimers - add send_nl_msg field
Send notifications when the label becomes active after an idle period.
Send netlink message notifications in addition to sysfs notifications.
Using a uevent with
subsystem=xt_idletimer
INTERFACE=...
STATE={active,inactive}
This is backport from common android-3.0
commit: beb914e987cbbd368988d2b94a6661cb907c4d5a
with uevent support instead of a new netlink message type.
Cc: JP Abgrall <jpa@...gle.com>
Cc: Ashish Sharma <ashishsharma@...gle.com>
Cc: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Signed-off-by: Ashish Sharma <ashishsharma@...gle.com>
Signed-off-by: JP Abgrall <jpa@...gle.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: dmitry pervushin <dmitry.pervushin@...aro.org>
---
include/uapi/linux/netfilter/xt_IDLETIMER.h | 16 +-
net/netfilter/xt_IDLETIMER.c | 234 +++++++++++++++++++--------
2 files changed, 180 insertions(+), 70 deletions(-)
diff --git a/include/uapi/linux/netfilter/xt_IDLETIMER.h b/include/uapi/linux/netfilter/xt_IDLETIMER.h
index 208ae93..e50bc3d 100644
--- a/include/uapi/linux/netfilter/xt_IDLETIMER.h
+++ b/include/uapi/linux/netfilter/xt_IDLETIMER.h
@@ -39,7 +39,21 @@ struct idletimer_tg_info {
char label[MAX_IDLETIMER_LABEL_SIZE];
/* for kernel module internal use only */
- struct idletimer_tg *timer __attribute__((aligned(8)));
+ struct idletimer_tg *timer __aligned(8);
};
+#define NL_EVENT_TYPE_INACTIVE 0
+#define NL_EVENT_TYPE_ACTIVE 1
+
+struct idletimer_tg_info_v1 {
+ __u32 timeout;
+
+ char label[MAX_IDLETIMER_LABEL_SIZE];
+
+ /* Use netlink messages for notification in addition to sysfs */
+ __u8 send_nl_msg;
+
+ /* for kernel module internal use only */
+ struct idletimer_tg *timer __aligned(8);
+};
#endif
diff --git a/net/netfilter/xt_IDLETIMER.c b/net/netfilter/xt_IDLETIMER.c
index 3540c04..6eb25ab 100644
--- a/net/netfilter/xt_IDLETIMER.c
+++ b/net/netfilter/xt_IDLETIMER.c
@@ -41,6 +41,8 @@
#include <linux/workqueue.h>
#include <linux/sysfs.h>
+#define NLMSG_MAX_SIZE 64
+
struct idletimer_tg_attr {
struct attribute attr;
ssize_t (*show)(struct kobject *kobj,
@@ -56,6 +58,8 @@ struct idletimer_tg {
struct idletimer_tg_attr attr;
unsigned int refcnt;
+ bool send_nl_msg;
+ bool active;
};
static LIST_HEAD(idletimer_tg_list);
@@ -63,6 +67,30 @@ static DEFINE_MUTEX(list_mutex);
static struct kobject *idletimer_tg_kobj;
+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 *envp[] = { iface_msg, state_msg, NULL };
+ int res;
+
+ res = snprintf(iface_msg, NLMSG_MAX_SIZE, "INTERFACE=%s",
+ iface);
+ if (NLMSG_MAX_SIZE <= res) {
+ pr_err("message too long (%d)", res);
+ return;
+ }
+ res = snprintf(state_msg, NLMSG_MAX_SIZE, "STATE=%s",
+ timer->active ? "active" : "inactive");
+ if (NLMSG_MAX_SIZE <= res) {
+ pr_err("message too long (%d)", res);
+ return;
+ }
+ pr_debug("putting nlmsg: <%s> <%s>\n", iface_msg, state_msg);
+ kobject_uevent_env(idletimer_tg_kobj, KOBJ_CHANGE, envp);
+ return;
+}
+
static
struct idletimer_tg *__idletimer_tg_find_by_label(const char *label)
{
@@ -83,6 +111,7 @@ static ssize_t idletimer_tg_show(struct kobject *kobj, struct attribute *attr,
{
struct idletimer_tg *timer;
unsigned long expires = 0;
+ unsigned long now = jiffies;
mutex_lock(&list_mutex);
@@ -92,11 +121,15 @@ static ssize_t idletimer_tg_show(struct kobject *kobj, struct attribute *attr,
mutex_unlock(&list_mutex);
- if (time_after(expires, jiffies))
+ if (time_after(expires, now))
return sprintf(buf, "%u\n",
- jiffies_to_msecs(expires - jiffies) / 1000);
+ jiffies_to_msecs(expires - now) / 1000);
- return sprintf(buf, "0\n");
+ if (timer->send_nl_msg)
+ return sprintf(buf, "0 %d\n",
+ jiffies_to_msecs(now - expires) / 1000);
+ else
+ return sprintf(buf, "0\n");
}
static void idletimer_tg_work(struct work_struct *work)
@@ -105,6 +138,9 @@ static void idletimer_tg_work(struct work_struct *work)
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(unsigned long data)
@@ -113,50 +149,46 @@ static void idletimer_tg_expired(unsigned long data)
pr_debug("timer %s expired\n", timer->attr.attr.name);
+ timer->active = false;
schedule_work(&timer->work);
}
-static int idletimer_tg_create(struct idletimer_tg_info *info)
+static int idletimer_tg_create(struct idletimer_tg *timer, const char *label,
+ unsigned long timeout, bool send_nl_msg)
{
int ret;
- info->timer = kmalloc(sizeof(*info->timer), GFP_KERNEL);
- if (!info->timer) {
+ timer->attr.attr.name = kstrdup(label, GFP_KERNEL);
+ if (!timer->attr.attr.name) {
ret = -ENOMEM;
goto out;
}
+ timer->attr.attr.mode = S_IRUGO;
+ timer->attr.show = idletimer_tg_show;
- 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 = S_IRUGO;
- info->timer->attr.show = idletimer_tg_show;
-
- ret = sysfs_create_file(idletimer_tg_kobj, &info->timer->attr.attr);
+ ret = sysfs_create_file(idletimer_tg_kobj, &timer->attr.attr);
if (ret < 0) {
pr_debug("couldn't add file to sysfs");
goto out_free_attr;
}
- list_add(&info->timer->entry, &idletimer_tg_list);
+ list_add(&timer->entry, &idletimer_tg_list);
- setup_timer(&info->timer->timer, idletimer_tg_expired,
- (unsigned long) info->timer);
- info->timer->refcnt = 1;
+ setup_timer(&timer->timer, idletimer_tg_expired,
+ (unsigned long)timer);
+ timer->active = true;
+ timer->refcnt = 1;
+ timer->send_nl_msg = send_nl_msg;
- mod_timer(&info->timer->timer,
- msecs_to_jiffies(info->timeout * 1000) + jiffies);
+ mod_timer(&timer->timer,
+ msecs_to_jiffies(timeout * 1000) + jiffies);
- INIT_WORK(&info->timer->work, idletimer_tg_work);
+ INIT_WORK(&timer->work, idletimer_tg_work);
return 0;
out_free_attr:
- kfree(info->timer->attr.attr.name);
-out_free_timer:
- kfree(info->timer);
+ kfree(timer->attr.attr.name);
out:
return ret;
}
@@ -164,45 +196,60 @@ out:
/*
* The actual xt_tables plugin.
*/
-static unsigned int idletimer_tg_target(struct sk_buff *skb,
- const struct xt_action_param *par)
+static unsigned int idletimer_tg_target_do(struct idletimer_tg *timer,
+ const char *label, u32 timeout)
{
- 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);
+ label, timeout);
- BUG_ON(!info->timer);
+ BUG_ON(!timer);
+ timer->active = true;
- if (time_before(info->timer->timer.expires, now)) {
- schedule_work(&info->timer->work);
+ if (time_before(timer->timer.expires, now)) {
+ schedule_work(&timer->work);
pr_debug("Starting timer %s (Expired, Jiffies): %lu, %lu\n",
- info->label, info->timer->timer.expires, now);
+ label, timer->timer.expires, now);
}
/* TODO: Avoid modifying timers on each packet */
- mod_timer(&info->timer->timer,
- msecs_to_jiffies(info->timeout * 1000) + now);
+ mod_timer(&timer->timer,
+ msecs_to_jiffies(timeout * 1000) + now);
return XT_CONTINUE;
}
-static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
+static unsigned int idletimer_tg_target(struct sk_buff *skb,
+ const struct xt_action_param *par)
+{
+ const struct idletimer_tg_info *info = par->targinfo;
+ return idletimer_tg_target_do(info->timer, info->label, info->timeout);
+}
+
+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;
+ return idletimer_tg_target_do(info->timer, info->label, info->timeout);
+}
+
+static int idletimer_tg_checkentry_do(struct idletimer_tg **timer_ret,
+ const char *label, u32 timeout, bool send_nl_msg)
{
- struct idletimer_tg_info *info = par->targinfo;
int ret;
unsigned long now = jiffies;
+ struct idletimer_tg *timer;
- pr_debug("checkentry targinfo%s\n", info->label);
+ pr_debug("checkentry targinfo %s\n", label);
- if (info->timeout == 0) {
+ if (timeout == 0) {
pr_debug("timeout value is zero\n");
return -EINVAL;
}
- if (info->label[0] == '\0' ||
- strnlen(info->label,
+ if (label[0] == '\0' ||
+ strnlen(label,
MAX_IDLETIMER_LABEL_SIZE) == MAX_IDLETIMER_LABEL_SIZE) {
pr_debug("label is empty or not nul-terminated\n");
return -EINVAL;
@@ -210,22 +257,31 @@ static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
mutex_lock(&list_mutex);
- info->timer = __idletimer_tg_find_by_label(info->label);
- if (info->timer) {
- info->timer->refcnt++;
- if (time_before(info->timer->timer.expires, now)) {
- schedule_work(&info->timer->work);
+ timer = __idletimer_tg_find_by_label(label);
+ if (timer) {
+ timer->refcnt++;
+ timer->active = true;
+
+ if (time_before(timer->timer.expires, now)) {
+ schedule_work(&timer->work);
pr_debug("Starting Checkentry timer (Expired, Jiffies): %lu, %lu\n",
- info->timer->timer.expires, now);
+ timer->timer.expires, now);
}
- mod_timer(&info->timer->timer,
- msecs_to_jiffies(info->timeout * 1000) + now);
+ mod_timer(&timer->timer,
+ msecs_to_jiffies(timeout * 1000) + now);
pr_debug("increased refcnt of timer %s to %u\n",
- info->label, info->timer->refcnt);
+ label, timer->refcnt);
} else {
- ret = idletimer_tg_create(info);
+ timer = kmalloc(sizeof(*timer), GFP_KERNEL);
+ if (!timer) {
+ ret = -ENOMEM;
+ mutex_unlock(&list_mutex);
+ return ret;
+ }
+ ret = idletimer_tg_create(timer, label, timeout, send_nl_msg);
if (ret < 0) {
+ kfree(timer);
pr_debug("failed to create timer\n");
mutex_unlock(&list_mutex);
return ret;
@@ -233,41 +289,80 @@ static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
}
mutex_unlock(&list_mutex);
+ *timer_ret = timer;
return 0;
}
-static void idletimer_tg_destroy(const struct xt_tgdtor_param *par)
+static void idletimer_tg_destroy_do(struct idletimer_tg *timer,
+ const char *label)
{
- const struct idletimer_tg_info *info = par->targinfo;
-
- pr_debug("destroy targinfo %s\n", info->label);
+ pr_debug("destroy targinfo %s\n", 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);
- kfree(info->timer->attr.attr.name);
- kfree(info->timer);
+ if (--timer->refcnt == 0) {
+ pr_debug("deleting timer %s\n", label);
+
+ list_del(&timer->entry);
+ del_timer_sync(&timer->timer);
+ sysfs_remove_file(idletimer_tg_kobj, &timer->attr.attr);
+ kfree(timer->attr.attr.name);
+ kfree(timer);
} else {
pr_debug("decreased refcnt of timer %s to %u\n",
- info->label, info->timer->refcnt);
+ label, timer->refcnt);
}
-
mutex_unlock(&list_mutex);
}
-static struct xt_target idletimer_tg __read_mostly = {
+static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
+{
+ struct idletimer_tg_info *info = par->targinfo;
+
+ return idletimer_tg_checkentry_do(&info->timer, info->label,
+ info->timeout, false);
+}
+
+static int idletimer_tg_checkentry_v1(const struct xt_tgchk_param *par)
+{
+ struct idletimer_tg_info_v1 *info = par->targinfo;
+
+ return idletimer_tg_checkentry_do(&info->timer, info->label,
+ info->timeout, info->send_nl_msg);
+}
+
+static void idletimer_tg_destroy(const struct xt_tgdtor_param *par)
+{
+ const struct idletimer_tg_info *info = par->targinfo;
+ idletimer_tg_destroy_do(info->timer, info->label);
+}
+
+static void idletimer_tg_destroy_v1(const struct xt_tgdtor_param *par)
+{
+ const struct idletimer_tg_info_v1 *info = par->targinfo;
+ idletimer_tg_destroy_do(info->timer, info->label);
+}
+
+static struct xt_target idletimer_tg[] __read_mostly = {
+{
.name = "IDLETIMER",
+ .revision = 0,
.family = NFPROTO_UNSPEC,
.target = idletimer_tg_target,
.targetsize = sizeof(struct idletimer_tg_info),
.checkentry = idletimer_tg_checkentry,
.destroy = idletimer_tg_destroy,
.me = THIS_MODULE,
+},
+{
+ .name = "IDLETIMER",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .target = idletimer_tg_target_v1,
+ .targetsize = sizeof(struct idletimer_tg_info_v1),
+ .checkentry = idletimer_tg_checkentry_v1,
+ .destroy = idletimer_tg_destroy_v1,
+ .me = THIS_MODULE,
+},
};
static struct class *idletimer_tg_class;
@@ -295,7 +390,7 @@ static int __init idletimer_tg_init(void)
idletimer_tg_kobj = &idletimer_tg_device->kobj;
- err = xt_register_target(&idletimer_tg);
+ err = xt_register_targets(idletimer_tg, ARRAY_SIZE(idletimer_tg));
if (err < 0) {
pr_debug("couldn't register xt target\n");
goto out_dev;
@@ -312,7 +407,7 @@ out:
static void __exit idletimer_tg_exit(void)
{
- xt_unregister_target(&idletimer_tg);
+ xt_unregister_targets(idletimer_tg, ARRAY_SIZE(idletimer_tg));
device_destroy(idletimer_tg_class, MKDEV(0, 0));
class_destroy(idletimer_tg_class);
@@ -327,3 +422,4 @@ MODULE_DESCRIPTION("Xtables: idle time monitor");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("ipt_IDLETIMER");
MODULE_ALIAS("ip6t_IDLETIMER");
+MODULE_ALIAS("arpt_IDLETIMER");
--
1.7.10.4
--
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