[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_log.c

#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(net, 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 = table->extra2;

	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].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;
		}
	}

	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
		table[i].extra2 = net;

	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:
#ifdef CONFIG_PROC_FS
	/* 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);
#endif
	return ret;
}

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

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;
}
Commit	Line	Data
f6ebe77f HW	1	#include <linux/kernel.h>
	2	#include <linux/init.h>
	3	#include <linux/module.h>
	4	#include <linux/proc_fs.h>
	5	#include <linux/skbuff.h>
	6	#include <linux/netfilter.h>
bbd86b9f	7	#include <linux/seq_file.h>
f6ebe77f	8	#include <net/protocol.h>
f01ffbd6	9	#include <net/netfilter/nf_log.h>
f6ebe77f HW	10
	11	#include "nf_internals.h"
	12
a5d29264	13	/* Internal logging interface, which relies on the real
f6ebe77f HW	14	LOG target modules */
	15
	16	#define NF_LOG_PREFIXLEN 128
17625274	17	#define NFLOGGER_NAME_LEN 64
f6ebe77f	18
ca735b3a	19	static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
9b73534d	20	static DEFINE_MUTEX(nf_log_mutex);
f6ebe77f	21
ca735b3a	22	static struct nf_logger __find_logger(int pf, const char str_logger)
f6ebe77f	23	{
ca735b3a	24	struct nf_logger *t;
f6ebe77f	25
ca735b3a EL	26	list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
	27	if (!strnicmp(str_logger, t->name, strlen(t->name)))
	28	return t;
	29	}
d72367b6	30
ca735b3a	31	return NULL;
601e68e1	32	}
f6ebe77f	33
30e0c6a6 G	34	void nf_log_set(struct net net, u_int8_t pf, const struct nf_logger logger)
	35	{
	36	const struct nf_logger *log;
	37
30e0c6a6 G	38	if (pf == NFPROTO_UNSPEC)
	39	return;
	40
	41	mutex_lock(&nf_log_mutex);
	42	log = rcu_dereference_protected(net->nf.nf_loggers[pf],
	43	lockdep_is_held(&nf_log_mutex));
	44	if (log == NULL)
	45	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
	46
	47	mutex_unlock(&nf_log_mutex);
	48	}
	49	EXPORT_SYMBOL(nf_log_set);
	50
	51	void nf_log_unset(struct net net, const struct nf_logger logger)
	52	{
	53	int i;
	54	const struct nf_logger *log;
	55
30e0c6a6 G	56	mutex_lock(&nf_log_mutex);
	57	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
	58	log = rcu_dereference_protected(net->nf.nf_loggers[i],
	59	lockdep_is_held(&nf_log_mutex));
	60	if (log == logger)
	61	RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
	62	}
	63	mutex_unlock(&nf_log_mutex);
	64	synchronize_rcu();
	65	}
	66	EXPORT_SYMBOL(nf_log_unset);
	67
d93cf068	68	/* return EEXIST if the same logger is registered, 0 on success. */
ca735b3a	69	int nf_log_register(u_int8_t pf, struct nf_logger *logger)
f6ebe77f	70	{
b6f0a365	71	int i;
ca735b3a	72
30e0c6a6	73	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
ca735b3a EL	74	return -EINVAL;
ca735b3a EL	75
b6f0a365 ED	76	for (i = 0; i < ARRAY_SIZE(logger->list); i++)
	77	INIT_LIST_HEAD(&logger->list[i]);
	78
9b73534d	79	mutex_lock(&nf_log_mutex);
ca735b3a EL	80
ca735b3a EL	81	if (pf == NFPROTO_UNSPEC) {
ca735b3a EL	82	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	83	list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
	84	} else {
	85	/* register at end of list to honor first register win */
	86	list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
ca735b3a EL	87	}
ca735b3a EL	88
9b73534d	89	mutex_unlock(&nf_log_mutex);
f6ebe77f	90
ca735b3a	91	return 0;
f6ebe77f	92	}
ca735b3a	93	EXPORT_SYMBOL(nf_log_register);
f6ebe77f	94
ca735b3a	95	void nf_log_unregister(struct nf_logger *logger)
f6ebe77f HW	96	{
	97	int i;
	98
9b73534d	99	mutex_lock(&nf_log_mutex);
30e0c6a6	100	for (i = 0; i < NFPROTO_NUMPROTO; i++)
ca735b3a	101	list_del(&logger->list[i]);
9b73534d	102	mutex_unlock(&nf_log_mutex);
f6ebe77f	103	}
e92ad99c	104	EXPORT_SYMBOL(nf_log_unregister);
f6ebe77f	105
30e0c6a6 G	106	int nf_log_bind_pf(struct net *net, u_int8_t pf,
30e0c6a6 G	107	const struct nf_logger *logger)
ca735b3a	108	{
30e0c6a6	109	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	110	return -EINVAL;
ca735b3a EL	111	mutex_lock(&nf_log_mutex);
	112	if (__find_logger(pf, logger->name) == NULL) {
	113	mutex_unlock(&nf_log_mutex);
	114	return -ENOENT;
	115	}
30e0c6a6	116	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
ca735b3a EL	117	mutex_unlock(&nf_log_mutex);
	118	return 0;
	119	}
	120	EXPORT_SYMBOL(nf_log_bind_pf);
	121
30e0c6a6	122	void nf_log_unbind_pf(struct net *net, u_int8_t pf)
ca735b3a	123	{
30e0c6a6	124	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	125	return;
ca735b3a	126	mutex_lock(&nf_log_mutex);
30e0c6a6	127	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
ca735b3a EL	128	mutex_unlock(&nf_log_mutex);
	129	}
	130	EXPORT_SYMBOL(nf_log_unbind_pf);
	131
30e0c6a6 G	132	void nf_log_packet(struct net *net,
30e0c6a6 G	133	u_int8_t pf,
f6ebe77f HW	134	unsigned int hooknum,
	135	const struct sk_buff *skb,
	136	const struct net_device *in,
	137	const struct net_device *out,
7b2f9631	138	const struct nf_loginfo *loginfo,
f6ebe77f HW	139	const char *fmt, ...)
	140	{
	141	va_list args;
	142	char prefix[NF_LOG_PREFIXLEN];
7b2f9631	143	const struct nf_logger *logger;
601e68e1	144
f6ebe77f	145	rcu_read_lock();
30e0c6a6	146	logger = rcu_dereference(net->nf.nf_loggers[pf]);
f6ebe77f HW	147	if (logger) {
	148	va_start(args, fmt);
	149	vsnprintf(prefix, sizeof(prefix), fmt, args);
	150	va_end(args);
8cdb46da	151	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
f6ebe77f HW	152	}
	153	rcu_read_unlock();
	154	}
	155	EXPORT_SYMBOL(nf_log_packet);
	156
	157	#ifdef CONFIG_PROC_FS
	158	static void seq_start(struct seq_file seq, loff_t *pos)
	159	{
30e0c6a6 G	160	struct net *net = seq_file_net(seq);
30e0c6a6 G	161
6440fe05	162	mutex_lock(&nf_log_mutex);
f6ebe77f	163
30e0c6a6	164	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	165	return NULL;
	166
	167	return pos;
	168	}
	169
	170	static void seq_next(struct seq_file s, void v, loff_t pos)
	171	{
30e0c6a6 G	172	struct net *net = seq_file_net(s);
30e0c6a6 G	173
f6ebe77f HW	174	(*pos)++;
f6ebe77f HW	175
30e0c6a6	176	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	177	return NULL;
	178
	179	return pos;
	180	}
	181
	182	static void seq_stop(struct seq_file s, void v)
	183	{
6440fe05	184	mutex_unlock(&nf_log_mutex);
f6ebe77f HW	185	}
	186
	187	static int seq_show(struct seq_file s, void v)
	188	{
	189	loff_t *pos = v;
	190	const struct nf_logger *logger;
c7a913cd EL	191	struct nf_logger *t;
c7a913cd EL	192	int ret;
30e0c6a6	193	struct net *net = seq_file_net(s);
f6ebe77f	194
30e0c6a6	195	logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
0e60ebe0	196	lockdep_is_held(&nf_log_mutex));
f6ebe77f HW	197
f6ebe77f HW	198	if (!logger)
c7a913cd EL	199	ret = seq_printf(s, "%2lld NONE (", *pos);
	200	else
	201	ret = seq_printf(s, "%2lld %s (", *pos, logger->name);
	202
	203	if (ret < 0)
	204	return ret;
	205
c7a913cd EL	206	list_for_each_entry(t, &nf_loggers_l[pos], list[pos]) {
c7a913cd EL	207	ret = seq_printf(s, "%s", t->name);
6440fe05	208	if (ret < 0)
c7a913cd	209	return ret;
c7a913cd EL	210	if (&t->list[pos] != nf_loggers_l[pos].prev) {
c7a913cd EL	211	ret = seq_printf(s, ",");
6440fe05	212	if (ret < 0)
c7a913cd	213	return ret;
c7a913cd EL	214	}
c7a913cd EL	215	}
601e68e1	216
c7a913cd	217	return seq_printf(s, ")\n");
f6ebe77f HW	218	}
f6ebe77f HW	219
56b3d975	220	static const struct seq_operations nflog_seq_ops = {
f6ebe77f HW	221	.start = seq_start,
	222	.next = seq_next,
	223	.stop = seq_stop,
	224	.show = seq_show,
	225	};
	226
	227	static int nflog_open(struct inode inode, struct file file)
	228	{
30e0c6a6 G	229	return seq_open_net(inode, file, &nflog_seq_ops,
30e0c6a6 G	230	sizeof(struct seq_net_private));
f6ebe77f HW	231	}
f6ebe77f HW	232
da7071d7	233	static const struct file_operations nflog_file_ops = {
f6ebe77f HW	234	.owner = THIS_MODULE,
	235	.open = nflog_open,
	236	.read = seq_read,
	237	.llseek = seq_lseek,
30e0c6a6	238	.release = seq_release_net,
f6ebe77f HW	239	};
f6ebe77f HW	240
17625274	241
f6ebe77f HW	242	#endif /* PROC_FS */
f6ebe77f HW	243
17625274	244	#ifdef CONFIG_SYSCTL
17625274 EL	245	static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
17625274 EL	246	static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
f6ebe77f	247
8d65af78	248	static int nf_log_proc_dostring(ctl_table *table, int write,
24955619	249	void __user buffer, size_t lenp, loff_t *ppos)
17625274 EL	250	{
17625274 EL	251	const struct nf_logger *logger;
24955619 PM	252	char buf[NFLOGGER_NAME_LEN];
24955619 PM	253	size_t size = *lenp;
17625274 EL	254	int r = 0;
17625274 EL	255	int tindex = (unsigned long)table->extra1;
b53cc178	256	struct net *net = table->extra2;
17625274 EL	257
17625274 EL	258	if (write) {
24955619 PM	259	if (size > sizeof(buf))
	260	size = sizeof(buf);
	261	if (copy_from_user(buf, buffer, size))
	262	return -EFAULT;
	263
	264	if (!strcmp(buf, "NONE")) {
30e0c6a6	265	nf_log_unbind_pf(net, tindex);
17625274 EL	266	return 0;
	267	}
	268	mutex_lock(&nf_log_mutex);
24955619	269	logger = __find_logger(tindex, buf);
17625274 EL	270	if (logger == NULL) {
	271	mutex_unlock(&nf_log_mutex);
	272	return -ENOENT;
	273	}
30e0c6a6	274	rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
17625274 EL	275	mutex_unlock(&nf_log_mutex);
17625274 EL	276	} else {
266d07cb	277	mutex_lock(&nf_log_mutex);
30e0c6a6	278	logger = rcu_dereference_protected(net->nf.nf_loggers[tindex],
0e60ebe0	279	lockdep_is_held(&nf_log_mutex));
17625274 EL	280	if (!logger)
	281	table->data = "NONE";
	282	else
	283	table->data = logger->name;
8d65af78	284	r = proc_dostring(table, write, buffer, lenp, ppos);
266d07cb	285	mutex_unlock(&nf_log_mutex);
17625274 EL	286	}
	287
	288	return r;
	289	}
	290
30e0c6a6	291	static int netfilter_log_sysctl_init(struct net *net)
f6ebe77f	292	{
ca735b3a	293	int i;
30e0c6a6 G	294	struct ctl_table *table;
	295
	296	table = nf_log_sysctl_table;
	297	if (!net_eq(net, &init_net)) {
	298	table = kmemdup(nf_log_sysctl_table,
	299	sizeof(nf_log_sysctl_table),
	300	GFP_KERNEL);
	301	if (!table)
	302	goto err_alloc;
	303	} else {
	304	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	305	snprintf(nf_log_sysctl_fnames[i],
	306	3, "%d", i);
	307	nf_log_sysctl_table[i].procname =
	308	nf_log_sysctl_fnames[i];
30e0c6a6 G	309	nf_log_sysctl_table[i].maxlen =
	310	NFLOGGER_NAME_LEN * sizeof(char);
	311	nf_log_sysctl_table[i].mode = 0644;
	312	nf_log_sysctl_table[i].proc_handler =
	313	nf_log_proc_dostring;
	314	nf_log_sysctl_table[i].extra1 =
	315	(void *)(unsigned long) i;
	316	}
17625274 EL	317	}
17625274 EL	318
b53cc178 JH	319	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	320	table[i].extra2 = net;
	321
30e0c6a6 G	322	net->nf.nf_log_dir_header = register_net_sysctl(net,
	323	"net/netfilter/nf_log",
	324	table);
	325	if (!net->nf.nf_log_dir_header)
	326	goto err_reg;
17625274 EL	327
17625274 EL	328	return 0;
30e0c6a6 G	329
	330	err_reg:
	331	if (!net_eq(net, &init_net))
	332	kfree(table);
	333	err_alloc:
	334	return -ENOMEM;
	335	}
	336
	337	static void netfilter_log_sysctl_exit(struct net *net)
	338	{
	339	struct ctl_table *table;
	340
	341	table = net->nf.nf_log_dir_header->ctl_table_arg;
	342	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
	343	if (!net_eq(net, &init_net))
	344	kfree(table);
17625274 EL	345	}
17625274 EL	346	#else
30e0c6a6	347	static int netfilter_log_sysctl_init(struct net *net)
17625274 EL	348	{
	349	return 0;
	350	}
30e0c6a6 G	351
	352	static void netfilter_log_sysctl_exit(struct net *net)
	353	{
	354	}
17625274 EL	355	#endif /* CONFIG_SYSCTL */
17625274 EL	356
30e0c6a6	357	static int __net_init nf_log_net_init(struct net *net)
17625274	358	{
30e0c6a6 G	359	int ret = -ENOMEM;
30e0c6a6 G	360
f6ebe77f	361	#ifdef CONFIG_PROC_FS
8eeee8b1	362	if (!proc_create("nf_log", S_IRUGO,
30e0c6a6 G	363	net->nf.proc_netfilter, &nflog_file_ops))
30e0c6a6 G	364	return ret;
62243927	365	#endif
30e0c6a6 G	366	ret = netfilter_log_sysctl_init(net);
	367	if (ret < 0)
	368	goto out_sysctl;
ca735b3a	369
30e0c6a6 G	370	return 0;
	371
	372	out_sysctl:
e778f56e	373	#ifdef CONFIG_PROC_FS
30e0c6a6 G	374	/* For init_net: errors will trigger panic, don't unroll on error. */
	375	if (!net_eq(net, &init_net))
	376	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	377	#endif
30e0c6a6 G	378	return ret;
	379	}
	380
	381	static void __net_exit nf_log_net_exit(struct net *net)
	382	{
	383	netfilter_log_sysctl_exit(net);
e778f56e	384	#ifdef CONFIG_PROC_FS
30e0c6a6	385	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	386	#endif
30e0c6a6 G	387	}
	388
	389	static struct pernet_operations nf_log_net_ops = {
	390	.init = nf_log_net_init,
	391	.exit = nf_log_net_exit,
	392	};
	393
	394	int __init netfilter_log_init(void)
	395	{
	396	int i, ret;
	397
	398	ret = register_pernet_subsys(&nf_log_net_ops);
	399	if (ret < 0)
	400	return ret;
17625274	401
ca735b3a EL	402	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	403	INIT_LIST_HEAD(&(nf_loggers_l[i]));
	404
f6ebe77f HW	405	return 0;
f6ebe77f HW	406	}