net/netfilter/nf_log.c - linux - Git at Google

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/proc_fs.h>
 #include <linux/skbuff.h>
 #include <linux/netfilter.h>
 #include <linux/seq_file.h>
 #include <net/protocol.h>
 #include <net/netfilter/nf_log.h>

 #include "nf_internals.h"

 /* Internal logging interface, which relies on the real
    LOG target modules */

 #define NF_LOG_PREFIXLEN		128
 #define NFLOGGER_NAME_LEN		64

 static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
 static DEFINE_MUTEX(nf_log_mutex);

 static struct nf_logger *__find_logger(int pf, const char *str_logger)
 {
 	struct nf_logger *t;

 	list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
 		if (!strnicmp(str_logger, t->name, strlen(t->name)))
 			return t;
 	}

 	return NULL;
 }

 void nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger)
 {
 	const struct nf_logger *log;

 	if (pf == NFPROTO_UNSPEC)
 		return;

 	mutex_lock(&nf_log_mutex);
 	log = rcu_dereference_protected(net->nf.nf_loggers[pf],
 					lockdep_is_held(&nf_log_mutex));
 	if (log == NULL)
 		rcu_assign_pointer(net->nf.nf_loggers[pf], logger);

 	mutex_unlock(&nf_log_mutex);
 }
 EXPORT_SYMBOL(nf_log_set);

 void nf_log_unset(struct net *net, const struct nf_logger *logger)
 {
 	int i;
 	const struct nf_logger *log;

 	mutex_lock(&nf_log_mutex);
 	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
 		log = rcu_dereference_protected(net->nf.nf_loggers[i],
 				lockdep_is_held(&nf_log_mutex));
 		if (log == logger)
 			RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
 	}
 	mutex_unlock(&nf_log_mutex);
 	synchronize_rcu();
 }
 EXPORT_SYMBOL(nf_log_unset);

 /* return EEXIST if the same logger is registered, 0 on success. */
 int nf_log_register(u_int8_t pf, struct nf_logger *logger)
 {
 	int i;

 	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
 		return -EINVAL;

 	for (i = 0; i < ARRAY_SIZE(logger->list); i++)
 		INIT_LIST_HEAD(&logger->list[i]);

 	mutex_lock(&nf_log_mutex);

 	if (pf == NFPROTO_UNSPEC) {
 		for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
 			list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
 	} else {
 		/* register at end of list to honor first register win */
 		list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
 	}

 	mutex_unlock(&nf_log_mutex);

 	return 0;
 }
 EXPORT_SYMBOL(nf_log_register);

 void nf_log_unregister(struct nf_logger *logger)
 {
 	int i;

 	mutex_lock(&nf_log_mutex);
 	for (i = 0; i < NFPROTO_NUMPROTO; i++)
 		list_del(&logger->list[i]);
 	mutex_unlock(&nf_log_mutex);
 }
 EXPORT_SYMBOL(nf_log_unregister);

 int nf_log_bind_pf(struct net *net, u_int8_t pf,
 		   const struct nf_logger *logger)
 {
 	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
 		return -EINVAL;
 	mutex_lock(&nf_log_mutex);
 	if (__find_logger(pf, logger->name) == NULL) {
 		mutex_unlock(&nf_log_mutex);
 		return -ENOENT;
 	}
 	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
 	mutex_unlock(&nf_log_mutex);
 	return 0;
 }
 EXPORT_SYMBOL(nf_log_bind_pf);

 void nf_log_unbind_pf(struct net *net, u_int8_t pf)
 {
 	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
 		return;
 	mutex_lock(&nf_log_mutex);
 	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
 	mutex_unlock(&nf_log_mutex);
 }
 EXPORT_SYMBOL(nf_log_unbind_pf);

 void nf_log_packet(struct net *net,
 		   u_int8_t pf,
 		   unsigned int hooknum,
 		   const struct sk_buff *skb,
 		   const struct net_device *in,
 		   const struct net_device *out,
 		   const struct nf_loginfo *loginfo,
 		   const char *fmt, ...)
 {
 	va_list args;
 	char prefix[NF_LOG_PREFIXLEN];
 	const struct nf_logger *logger;

 	rcu_read_lock();
 	logger = rcu_dereference(net->nf.nf_loggers[pf]);
 	if (logger) {
 		va_start(args, fmt);
 		vsnprintf(prefix, sizeof(prefix), fmt, args);
 		va_end(args);
 		logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
 	}
 	rcu_read_unlock();
 }
 EXPORT_SYMBOL(nf_log_packet);

 #ifdef CONFIG_PROC_FS
 static void *seq_start(struct seq_file *seq, loff_t *pos)
 {
 	struct net *net = seq_file_net(seq);

 	mutex_lock(&nf_log_mutex);

 	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
 		return NULL;

 	return pos;
 }

 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
 	struct net *net = seq_file_net(s);

 	(*pos)++;

 	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
 		return NULL;

 	return pos;
 }

 static void seq_stop(struct seq_file *s, void *v)
 {
 	mutex_unlock(&nf_log_mutex);
 }

 static int seq_show(struct seq_file *s, void *v)
 {
 	loff_t *pos = v;
 	const struct nf_logger *logger;
 	struct nf_logger *t;
 	int ret;
 	struct net *net = seq_file_net(s);

 	logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
 					   lockdep_is_held(&nf_log_mutex));

 	if (!logger)
 		ret = seq_printf(s, "%2lld NONE (", *pos);
 	else
 		ret = seq_printf(s, "%2lld %s (", *pos, logger->name);

 	if (ret < 0)
 		return ret;

 	list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
 		ret = seq_printf(s, "%s", t->name);
 		if (ret < 0)
 			return ret;
 		if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
 			ret = seq_printf(s, ",");
 			if (ret < 0)
 				return ret;
 		}
 	}

 	return seq_printf(s, ")\n");
 }

 static const struct seq_operations nflog_seq_ops = {
 	.start	= seq_start,
 	.next	= seq_next,
 	.stop	= seq_stop,
 	.show	= seq_show,
 };

 static int nflog_open(struct inode *inode, struct file *file)
 {
 	return seq_open_net(inode, file, &nflog_seq_ops,
 			    sizeof(struct seq_net_private));
 }

 static const struct file_operations nflog_file_ops = {
 	.owner	 = THIS_MODULE,
 	.open	 = nflog_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,
 	.release = seq_release_net,
 };


 #endif /* PROC_FS */

 #ifdef CONFIG_SYSCTL
 static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
 static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];

 static int nf_log_proc_dostring(ctl_table *table, int write,
 			 void __user *buffer, size_t *lenp, loff_t *ppos)
 {
 	const struct nf_logger *logger;
 	char buf[NFLOGGER_NAME_LEN];
 	size_t size = *lenp;
 	int r = 0;
 	int tindex = (unsigned long)table->extra1;
 	struct net *net = current->nsproxy->net_ns;

 	if (write) {
 		if (size > sizeof(buf))
 			size = sizeof(buf);
 		if (copy_from_user(buf, buffer, size))
 			return -EFAULT;

 		if (!strcmp(buf, "NONE")) {
 			nf_log_unbind_pf(net, tindex);
 			return 0;
 		}
 		mutex_lock(&nf_log_mutex);
 		logger = __find_logger(tindex, buf);
 		if (logger == NULL) {
 			mutex_unlock(&nf_log_mutex);
 			return -ENOENT;
 		}
 		rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
 		mutex_unlock(&nf_log_mutex);
 	} else {
 		mutex_lock(&nf_log_mutex);
 		logger = rcu_dereference_protected(net->nf.nf_loggers[tindex],
 						   lockdep_is_held(&nf_log_mutex));
 		if (!logger)
 			table->data = "NONE";
 		else
 			table->data = logger->name;
 		r = proc_dostring(table, write, buffer, lenp, ppos);
 		mutex_unlock(&nf_log_mutex);
 	}

 	return r;
 }

 static int netfilter_log_sysctl_init(struct net *net)
 {
 	int i;
 	struct ctl_table *table;

 	table = nf_log_sysctl_table;
 	if (!net_eq(net, &init_net)) {
 		table = kmemdup(nf_log_sysctl_table,
 				 sizeof(nf_log_sysctl_table),
 				 GFP_KERNEL);
 		if (!table)
 			goto err_alloc;
 	} else {
 		for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
 			snprintf(nf_log_sysctl_fnames[i],
 				 3, "%d", i);
 			nf_log_sysctl_table[i].procname	=
 				nf_log_sysctl_fnames[i];
 			nf_log_sysctl_table[i].data = NULL;
 			nf_log_sysctl_table[i].maxlen =
 				NFLOGGER_NAME_LEN * sizeof(char);
 			nf_log_sysctl_table[i].mode = 0644;
 			nf_log_sysctl_table[i].proc_handler =
 				nf_log_proc_dostring;
 			nf_log_sysctl_table[i].extra1 =
 				(void *)(unsigned long) i;
 		}
 	}

 	net->nf.nf_log_dir_header = register_net_sysctl(net,
 						"net/netfilter/nf_log",
 						table);
 	if (!net->nf.nf_log_dir_header)
 		goto err_reg;

 	return 0;

 err_reg:
 	if (!net_eq(net, &init_net))
 		kfree(table);
 err_alloc:
 	return -ENOMEM;
 }

 static void netfilter_log_sysctl_exit(struct net *net)
 {
 	struct ctl_table *table;

 	table = net->nf.nf_log_dir_header->ctl_table_arg;
 	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
 	if (!net_eq(net, &init_net))
 		kfree(table);
 }
 #else
 static int netfilter_log_sysctl_init(struct net *net)
 {
 	return 0;
 }

 static void netfilter_log_sysctl_exit(struct net *net)
 {
 }
 #endif /* CONFIG_SYSCTL */

 static int __net_init nf_log_net_init(struct net *net)
 {
 	int ret = -ENOMEM;

 #ifdef CONFIG_PROC_FS
 	if (!proc_create("nf_log", S_IRUGO,
 			 net->nf.proc_netfilter, &nflog_file_ops))
 		return ret;
 #endif
 	ret = netfilter_log_sysctl_init(net);
 	if (ret < 0)
 		goto out_sysctl;

 	return 0;

 out_sysctl:
 	/* For init_net: errors will trigger panic, don't unroll on error. */
 	if (!net_eq(net, &init_net))
 		remove_proc_entry("nf_log", net->nf.proc_netfilter);

 	return ret;
 }

 static void __net_exit nf_log_net_exit(struct net *net)
 {
 	netfilter_log_sysctl_exit(net);
 	remove_proc_entry("nf_log", net->nf.proc_netfilter);
 }

 static struct pernet_operations nf_log_net_ops = {
 	.init = nf_log_net_init,
 	.exit = nf_log_net_exit,
 };

 int __init netfilter_log_init(void)
 {
 	int i, ret;

 	ret = register_pernet_subsys(&nf_log_net_ops);
 	if (ret < 0)
 		return ret;

 	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
 		INIT_LIST_HEAD(&(nf_loggers_l[i]));

 	return 0;
 }
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/proc_fs.h>
	#include <linux/skbuff.h>
	#include <linux/netfilter.h>
	#include <linux/seq_file.h>
	#include <net/protocol.h>
	#include <net/netfilter/nf_log.h>

	#include "nf_internals.h"

	/* Internal logging interface, which relies on the real
	LOG target modules */

	#define NF_LOG_PREFIXLEN 128
	#define NFLOGGER_NAME_LEN 64

	static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
	static DEFINE_MUTEX(nf_log_mutex);

	static struct nf_logger __find_logger(int pf, const char str_logger)
	{
	struct nf_logger *t;

	list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
	if (!strnicmp(str_logger, t->name, strlen(t->name)))
	return t;
	}

	return NULL;
	}

	void nf_log_set(struct net net, u_int8_t pf, const struct nf_logger logger)
	{
	const struct nf_logger *log;

	if (pf == NFPROTO_UNSPEC)
	return;

	mutex_lock(&nf_log_mutex);
	log = rcu_dereference_protected(net->nf.nf_loggers[pf],
	lockdep_is_held(&nf_log_mutex));
	if (log == NULL)
	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);

	mutex_unlock(&nf_log_mutex);
	}
	EXPORT_SYMBOL(nf_log_set);

	void nf_log_unset(struct net net, const struct nf_logger logger)
	{
	int i;
	const struct nf_logger *log;

	mutex_lock(&nf_log_mutex);
	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
	log = rcu_dereference_protected(net->nf.nf_loggers[i],
	lockdep_is_held(&nf_log_mutex));
	if (log == logger)
	RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
	}
	mutex_unlock(&nf_log_mutex);
	synchronize_rcu();
	}
	EXPORT_SYMBOL(nf_log_unset);

	/* return EEXIST if the same logger is registered, 0 on success. */
	int nf_log_register(u_int8_t pf, struct nf_logger *logger)
	{
	int i;

	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
	return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(logger->list); i++)
	INIT_LIST_HEAD(&logger->list[i]);

	mutex_lock(&nf_log_mutex);

	if (pf == NFPROTO_UNSPEC) {
	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
	} else {
	/* register at end of list to honor first register win */
	list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
	}

	mutex_unlock(&nf_log_mutex);

	return 0;
	}
	EXPORT_SYMBOL(nf_log_register);

	void nf_log_unregister(struct nf_logger *logger)
	{
	int i;

	mutex_lock(&nf_log_mutex);
	for (i = 0; i < NFPROTO_NUMPROTO; i++)
	list_del(&logger->list[i]);
	mutex_unlock(&nf_log_mutex);
	}
	EXPORT_SYMBOL(nf_log_unregister);

	int nf_log_bind_pf(struct net *net, u_int8_t pf,
	const struct nf_logger *logger)
	{
	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
	return -EINVAL;
	mutex_lock(&nf_log_mutex);
	if (__find_logger(pf, logger->name) == NULL) {
	mutex_unlock(&nf_log_mutex);
	return -ENOENT;
	}
	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
	mutex_unlock(&nf_log_mutex);
	return 0;
	}
	EXPORT_SYMBOL(nf_log_bind_pf);

	void nf_log_unbind_pf(struct net *net, u_int8_t pf)
	{
	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
	return;
	mutex_lock(&nf_log_mutex);
	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
	mutex_unlock(&nf_log_mutex);
	}
	EXPORT_SYMBOL(nf_log_unbind_pf);

	void nf_log_packet(struct net *net,
	u_int8_t pf,
	unsigned int hooknum,
	const struct sk_buff *skb,
	const struct net_device *in,
	const struct net_device *out,
	const struct nf_loginfo *loginfo,
	const char *fmt, ...)
	{
	va_list args;
	char prefix[NF_LOG_PREFIXLEN];
	const struct nf_logger *logger;

	rcu_read_lock();
	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	if (logger) {
	va_start(args, fmt);
	vsnprintf(prefix, sizeof(prefix), fmt, args);
	va_end(args);
	logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
	}
	rcu_read_unlock();
	}
	EXPORT_SYMBOL(nf_log_packet);

	#ifdef CONFIG_PROC_FS
	static void seq_start(struct seq_file seq, loff_t *pos)
	{
	struct net *net = seq_file_net(seq);

	mutex_lock(&nf_log_mutex);

	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
	return NULL;

	return pos;
	}

	static void seq_next(struct seq_file s, void v, loff_t pos)
	{
	struct net *net = seq_file_net(s);

	(*pos)++;

	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
	return NULL;

	return pos;
	}

	static void seq_stop(struct seq_file s, void v)
	{
	mutex_unlock(&nf_log_mutex);
	}

	static int seq_show(struct seq_file s, void v)
	{
	loff_t *pos = v;
	const struct nf_logger *logger;
	struct nf_logger *t;
	int ret;
	struct net *net = seq_file_net(s);

	logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
	lockdep_is_held(&nf_log_mutex));

	if (!logger)
	ret = seq_printf(s, "%2lld NONE (", *pos);
	else
	ret = seq_printf(s, "%2lld %s (", *pos, logger->name);

	if (ret < 0)
	return ret;

	list_for_each_entry(t, &nf_loggers_l[pos], list[pos]) {
	ret = seq_printf(s, "%s", t->name);
	if (ret < 0)
	return ret;
	if (&t->list[pos] != nf_loggers_l[pos].prev) {
	ret = seq_printf(s, ",");
	if (ret < 0)
	return ret;
	}
	}

	return seq_printf(s, ")\n");
	}

	static const struct seq_operations nflog_seq_ops = {
	.start = seq_start,
	.next = seq_next,
	.stop = seq_stop,
	.show = seq_show,
	};

	static int nflog_open(struct inode inode, struct file file)
	{
	return seq_open_net(inode, file, &nflog_seq_ops,
	sizeof(struct seq_net_private));
	}

	static const struct file_operations nflog_file_ops = {
	.owner = THIS_MODULE,
	.open = nflog_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release_net,
	};


	#endif /* PROC_FS */

	#ifdef CONFIG_SYSCTL
	static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
	static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];

	static int nf_log_proc_dostring(ctl_table *table, int write,
	void __user buffer, size_t lenp, loff_t *ppos)
	{
	const struct nf_logger *logger;
	char buf[NFLOGGER_NAME_LEN];
	size_t size = *lenp;
	int r = 0;
	int tindex = (unsigned long)table->extra1;
	struct net *net = current->nsproxy->net_ns;

	if (write) {
	if (size > sizeof(buf))
	size = sizeof(buf);
	if (copy_from_user(buf, buffer, size))
	return -EFAULT;

	if (!strcmp(buf, "NONE")) {
	nf_log_unbind_pf(net, tindex);
	return 0;
	}
	mutex_lock(&nf_log_mutex);
	logger = __find_logger(tindex, buf);
	if (logger == NULL) {
	mutex_unlock(&nf_log_mutex);
	return -ENOENT;
	}
	rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
	mutex_unlock(&nf_log_mutex);
	} else {
	mutex_lock(&nf_log_mutex);
	logger = rcu_dereference_protected(net->nf.nf_loggers[tindex],
	lockdep_is_held(&nf_log_mutex));
	if (!logger)
	table->data = "NONE";
	else
	table->data = logger->name;
	r = proc_dostring(table, write, buffer, lenp, ppos);
	mutex_unlock(&nf_log_mutex);
	}

	return r;
	}

	static int netfilter_log_sysctl_init(struct net *net)
	{
	int i;
	struct ctl_table *table;

	table = nf_log_sysctl_table;
	if (!net_eq(net, &init_net)) {
	table = kmemdup(nf_log_sysctl_table,
	sizeof(nf_log_sysctl_table),
	GFP_KERNEL);
	if (!table)
	goto err_alloc;
	} else {
	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	snprintf(nf_log_sysctl_fnames[i],
	3, "%d", i);
	nf_log_sysctl_table[i].procname =
	nf_log_sysctl_fnames[i];
	nf_log_sysctl_table[i].data = NULL;
	nf_log_sysctl_table[i].maxlen =
	NFLOGGER_NAME_LEN * sizeof(char);
	nf_log_sysctl_table[i].mode = 0644;
	nf_log_sysctl_table[i].proc_handler =
	nf_log_proc_dostring;
	nf_log_sysctl_table[i].extra1 =
	(void *)(unsigned long) i;
	}
	}

	net->nf.nf_log_dir_header = register_net_sysctl(net,
	"net/netfilter/nf_log",
	table);
	if (!net->nf.nf_log_dir_header)
	goto err_reg;

	return 0;

	err_reg:
	if (!net_eq(net, &init_net))
	kfree(table);
	err_alloc:
	return -ENOMEM;
	}

	static void netfilter_log_sysctl_exit(struct net *net)
	{
	struct ctl_table *table;

	table = net->nf.nf_log_dir_header->ctl_table_arg;
	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
	if (!net_eq(net, &init_net))
	kfree(table);
	}
	#else
	static int netfilter_log_sysctl_init(struct net *net)
	{
	return 0;
	}

	static void netfilter_log_sysctl_exit(struct net *net)
	{
	}
	#endif /* CONFIG_SYSCTL */

	static int __net_init nf_log_net_init(struct net *net)
	{
	int ret = -ENOMEM;

	#ifdef CONFIG_PROC_FS
	if (!proc_create("nf_log", S_IRUGO,
	net->nf.proc_netfilter, &nflog_file_ops))
	return ret;
	#endif
	ret = netfilter_log_sysctl_init(net);
	if (ret < 0)
	goto out_sysctl;

	return 0;

	out_sysctl:
	/* For init_net: errors will trigger panic, don't unroll on error. */
	if (!net_eq(net, &init_net))
	remove_proc_entry("nf_log", net->nf.proc_netfilter);

	return ret;
	}

	static void __net_exit nf_log_net_exit(struct net *net)
	{
	netfilter_log_sysctl_exit(net);
	remove_proc_entry("nf_log", net->nf.proc_netfilter);
	}

	static struct pernet_operations nf_log_net_ops = {
	.init = nf_log_net_init,
	.exit = nf_log_net_exit,
	};

	int __init netfilter_log_init(void)
	{
	int i, ret;

	ret = register_pernet_subsys(&nf_log_net_ops);
	if (ret < 0)
	return ret;

	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	INIT_LIST_HEAD(&(nf_loggers_l[i]));

	return 0;
	}