[deliverable/linux.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 nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __read_mostly;
static DEFINE_MUTEX(nf_log_mutex);

#define nft_log_dereference(logger) \
	rcu_dereference_protected(logger, lockdep_is_held(&nf_log_mutex))

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

	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
		if (loggers[pf][i] == NULL)
			continue;

		log = nft_log_dereference(loggers[pf][i]);
		if (!strncasecmp(str_logger, log->name, strlen(log->name)))
			return log;
	}

	return NULL;
}

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

	if (pf == NFPROTO_UNSPEC || pf >= ARRAY_SIZE(net->nf.nf_loggers))
		return -EOPNOTSUPP;

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

	mutex_unlock(&nf_log_mutex);

	return 0;
}
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 = nft_log_dereference(net->nf.nf_loggers[i]);
		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;
	int ret = 0;

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

	mutex_lock(&nf_log_mutex);

	if (pf == NFPROTO_UNSPEC) {
		for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
			if (rcu_access_pointer(loggers[i][logger->type])) {
				ret = -EEXIST;
				goto unlock;
			}
		}
		for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
			rcu_assign_pointer(loggers[i][logger->type], logger);
	} else {
		if (rcu_access_pointer(loggers[pf][logger->type])) {
			ret = -EEXIST;
			goto unlock;
		}
		rcu_assign_pointer(loggers[pf][logger->type], logger);
	}

unlock:
	mutex_unlock(&nf_log_mutex);
	return ret;
}
EXPORT_SYMBOL(nf_log_register);

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

	mutex_lock(&nf_log_mutex);
	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
		log = nft_log_dereference(loggers[i][logger->type]);
		if (log == logger)
			RCU_INIT_POINTER(loggers[i][logger->type], NULL);
	}
	mutex_unlock(&nf_log_mutex);
	synchronize_rcu();
}
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_logger_request_module(int pf, enum nf_log_type type)
{
	if (loggers[pf][type] == NULL)
		request_module("nf-logger-%u-%u", pf, type);
}
EXPORT_SYMBOL_GPL(nf_logger_request_module);

int nf_logger_find_get(int pf, enum nf_log_type type)
{
	struct nf_logger *logger;
	int ret = -ENOENT;

	if (pf == NFPROTO_INET) {
		ret = nf_logger_find_get(NFPROTO_IPV4, type);
		if (ret < 0)
			return ret;

		ret = nf_logger_find_get(NFPROTO_IPV6, type);
		if (ret < 0) {
			nf_logger_put(NFPROTO_IPV4, type);
			return ret;
		}

		return 0;
	}

	if (rcu_access_pointer(loggers[pf][type]) == NULL)
		request_module("nf-logger-%u-%u", pf, type);

	rcu_read_lock();
	logger = rcu_dereference(loggers[pf][type]);
	if (logger == NULL)
		goto out;

	if (try_module_get(logger->me))
		ret = 0;
out:
	rcu_read_unlock();
	return ret;
}
EXPORT_SYMBOL_GPL(nf_logger_find_get);

void nf_logger_put(int pf, enum nf_log_type type)
{
	struct nf_logger *logger;

	if (pf == NFPROTO_INET) {
		nf_logger_put(NFPROTO_IPV4, type);
		nf_logger_put(NFPROTO_IPV6, type);
		return;
	}

	BUG_ON(loggers[pf][type] == NULL);

	rcu_read_lock();
	logger = rcu_dereference(loggers[pf][type]);
	module_put(logger->me);
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(nf_logger_put);

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();
	if (loginfo != NULL)
		logger = rcu_dereference(loggers[pf][loginfo->type]);
	else
		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);

void nf_log_trace(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_trace);

#define S_SIZE (1024 - (sizeof(unsigned int) + 1))

struct nf_log_buf {
	unsigned int	count;
	char		buf[S_SIZE + 1];
};
static struct nf_log_buf emergency, *emergency_ptr = &emergency;

__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...)
{
	va_list args;
	int len;

	if (likely(m->count < S_SIZE)) {
		va_start(args, f);
		len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
		va_end(args);
		if (likely(m->count + len < S_SIZE)) {
			m->count += len;
			return 0;
		}
	}
	m->count = S_SIZE;
	printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
	return -1;
}
EXPORT_SYMBOL_GPL(nf_log_buf_add);

struct nf_log_buf *nf_log_buf_open(void)
{
	struct nf_log_buf *m = kmalloc(sizeof(*m), GFP_ATOMIC);

	if (unlikely(!m)) {
		local_bh_disable();
		do {
			m = xchg(&emergency_ptr, NULL);
		} while (!m);
	}
	m->count = 0;
	return m;
}
EXPORT_SYMBOL_GPL(nf_log_buf_open);

void nf_log_buf_close(struct nf_log_buf *m)
{
	m->buf[m->count] = 0;
	printk("%s\n", m->buf);

	if (likely(m != &emergency))
		kfree(m);
	else {
		emergency_ptr = m;
		local_bh_enable();
	}
}
EXPORT_SYMBOL_GPL(nf_log_buf_close);

#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;
	int i;
	struct net *net = seq_file_net(s);

	logger = nft_log_dereference(net->nf.nf_loggers[*pos]);

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

	if (seq_has_overflowed(s))
		return -ENOSPC;

	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
		if (loggers[*pos][i] == NULL)
			continue;

		logger = nft_log_dereference(loggers[*pos][i]);
		seq_printf(s, "%s", logger->name);
		if (i == 0 && loggers[*pos][i + 1] != NULL)
			seq_printf(s, ",");

		if (seq_has_overflowed(s))
			return -ENOSPC;
	}

	seq_printf(s, ")\n");

	if (seq_has_overflowed(s))
		return -ENOSPC;
	return 0;
}

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

	if (write) {
		struct ctl_table tmp = *table;

		tmp.data = buf;
		r = proc_dostring(&tmp, write, buffer, lenp, ppos);
		if (r)
			return r;

		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 = nft_log_dereference(net->nf.nf_loggers[tindex]);
		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;
			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:
#ifdef CONFIG_PROC_FS
	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)
{
	return register_pernet_subsys(&nf_log_net_ops);
}
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
5962815a	19	static struct nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __read_mostly;
9b73534d	20	static DEFINE_MUTEX(nf_log_mutex);
f6ebe77f	21
0c26ed1c ML	22	#define nft_log_dereference(logger) \
	23	rcu_dereference_protected(logger, lockdep_is_held(&nf_log_mutex))
	24
ca735b3a	25	static struct nf_logger __find_logger(int pf, const char str_logger)
f6ebe77f	26	{
5962815a PNA	27	struct nf_logger *log;
	28	int i;
	29
	30	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	31	if (loggers[pf][i] == NULL)
	32	continue;
f6ebe77f	33
0c26ed1c	34	log = nft_log_dereference(loggers[pf][i]);
18082746	35	if (!strncasecmp(str_logger, log->name, strlen(log->name)))
5962815a	36	return log;
ca735b3a	37	}
d72367b6	38
ca735b3a	39	return NULL;
601e68e1	40	}
f6ebe77f	41
779994fa	42	int nf_log_set(struct net net, u_int8_t pf, const struct nf_logger logger)
30e0c6a6 G	43	{
	44	const struct nf_logger *log;
	45
779994fa GF	46	if (pf == NFPROTO_UNSPEC \|\| pf >= ARRAY_SIZE(net->nf.nf_loggers))
779994fa GF	47	return -EOPNOTSUPP;
30e0c6a6 G	48
30e0c6a6 G	49	mutex_lock(&nf_log_mutex);
0c26ed1c	50	log = nft_log_dereference(net->nf.nf_loggers[pf]);
30e0c6a6 G	51	if (log == NULL)
	52	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
	53
	54	mutex_unlock(&nf_log_mutex);
779994fa GF	55
779994fa GF	56	return 0;
30e0c6a6 G	57	}
	58	EXPORT_SYMBOL(nf_log_set);
	59
	60	void nf_log_unset(struct net net, const struct nf_logger logger)
	61	{
	62	int i;
	63	const struct nf_logger *log;
	64
30e0c6a6 G	65	mutex_lock(&nf_log_mutex);
30e0c6a6 G	66	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
0c26ed1c	67	log = nft_log_dereference(net->nf.nf_loggers[i]);
30e0c6a6 G	68	if (log == logger)
	69	RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
	70	}
	71	mutex_unlock(&nf_log_mutex);
	72	synchronize_rcu();
	73	}
	74	EXPORT_SYMBOL(nf_log_unset);
	75
d93cf068	76	/* return EEXIST if the same logger is registered, 0 on success. */
ca735b3a	77	int nf_log_register(u_int8_t pf, struct nf_logger *logger)
f6ebe77f	78	{
b6f0a365	79	int i;
8ac2bde2	80	int ret = 0;
ca735b3a	81
30e0c6a6	82	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
ca735b3a EL	83	return -EINVAL;
ca735b3a EL	84
9b73534d	85	mutex_lock(&nf_log_mutex);
ca735b3a EL	86
ca735b3a EL	87	if (pf == NFPROTO_UNSPEC) {
8ac2bde2 ML	88	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	89	if (rcu_access_pointer(loggers[i][logger->type])) {
	90	ret = -EEXIST;
	91	goto unlock;
	92	}
	93	}
ca735b3a	94	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
5962815a	95	rcu_assign_pointer(loggers[i][logger->type], logger);
ca735b3a	96	} else {
8ac2bde2 ML	97	if (rcu_access_pointer(loggers[pf][logger->type])) {
	98	ret = -EEXIST;
	99	goto unlock;
	100	}
5962815a	101	rcu_assign_pointer(loggers[pf][logger->type], logger);
ca735b3a EL	102	}
ca735b3a EL	103
8ac2bde2	104	unlock:
9b73534d	105	mutex_unlock(&nf_log_mutex);
8ac2bde2	106	return ret;
f6ebe77f	107	}
ca735b3a	108	EXPORT_SYMBOL(nf_log_register);
f6ebe77f	109
ca735b3a	110	void nf_log_unregister(struct nf_logger *logger)
f6ebe77f	111	{
205ee117	112	const struct nf_logger *log;
f6ebe77f HW	113	int i;
f6ebe77f HW	114
9b73534d	115	mutex_lock(&nf_log_mutex);
205ee117 FW	116	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
	117	log = nft_log_dereference(loggers[i][logger->type]);
	118	if (log == logger)
	119	RCU_INIT_POINTER(loggers[i][logger->type], NULL);
	120	}
9b73534d	121	mutex_unlock(&nf_log_mutex);
ad5001cc	122	synchronize_rcu();
f6ebe77f	123	}
e92ad99c	124	EXPORT_SYMBOL(nf_log_unregister);
f6ebe77f	125
30e0c6a6 G	126	int nf_log_bind_pf(struct net *net, u_int8_t pf,
30e0c6a6 G	127	const struct nf_logger *logger)
ca735b3a	128	{
30e0c6a6	129	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	130	return -EINVAL;
ca735b3a EL	131	mutex_lock(&nf_log_mutex);
	132	if (__find_logger(pf, logger->name) == NULL) {
	133	mutex_unlock(&nf_log_mutex);
	134	return -ENOENT;
	135	}
30e0c6a6	136	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
ca735b3a EL	137	mutex_unlock(&nf_log_mutex);
	138	return 0;
	139	}
	140	EXPORT_SYMBOL(nf_log_bind_pf);
	141
30e0c6a6	142	void nf_log_unbind_pf(struct net *net, u_int8_t pf)
ca735b3a	143	{
30e0c6a6	144	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	145	return;
ca735b3a	146	mutex_lock(&nf_log_mutex);
30e0c6a6	147	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
ca735b3a EL	148	mutex_unlock(&nf_log_mutex);
	149	}
	150	EXPORT_SYMBOL(nf_log_unbind_pf);
	151
960649d1 PNA	152	void nf_logger_request_module(int pf, enum nf_log_type type)
	153	{
	154	if (loggers[pf][type] == NULL)
	155	request_module("nf-logger-%u-%u", pf, type);
	156	}
	157	EXPORT_SYMBOL_GPL(nf_logger_request_module);
	158
fab4085f PNA	159	int nf_logger_find_get(int pf, enum nf_log_type type)
	160	{
	161	struct nf_logger *logger;
	162	int ret = -ENOENT;
	163
f3bb5333 LZ	164	if (pf == NFPROTO_INET) {
	165	ret = nf_logger_find_get(NFPROTO_IPV4, type);
	166	if (ret < 0)
	167	return ret;
	168
	169	ret = nf_logger_find_get(NFPROTO_IPV6, type);
	170	if (ret < 0) {
	171	nf_logger_put(NFPROTO_IPV4, type);
	172	return ret;
	173	}
	174
	175	return 0;
	176	}
	177
c5a589cc	178	if (rcu_access_pointer(loggers[pf][type]) == NULL)
fab4085f PNA	179	request_module("nf-logger-%u-%u", pf, type);
	180
	181	rcu_read_lock();
	182	logger = rcu_dereference(loggers[pf][type]);
	183	if (logger == NULL)
	184	goto out;
	185
7e53e7f8	186	if (try_module_get(logger->me))
fab4085f PNA	187	ret = 0;
	188	out:
	189	rcu_read_unlock();
	190	return ret;
	191	}
	192	EXPORT_SYMBOL_GPL(nf_logger_find_get);
	193
	194	void nf_logger_put(int pf, enum nf_log_type type)
	195	{
	196	struct nf_logger *logger;
	197
f3bb5333 LZ	198	if (pf == NFPROTO_INET) {
	199	nf_logger_put(NFPROTO_IPV4, type);
	200	nf_logger_put(NFPROTO_IPV6, type);
	201	return;
	202	}
	203
fab4085f PNA	204	BUG_ON(loggers[pf][type] == NULL);
	205
	206	rcu_read_lock();
	207	logger = rcu_dereference(loggers[pf][type]);
	208	module_put(logger->me);
	209	rcu_read_unlock();
	210	}
	211	EXPORT_SYMBOL_GPL(nf_logger_put);
	212
30e0c6a6 G	213	void nf_log_packet(struct net *net,
30e0c6a6 G	214	u_int8_t pf,
f6ebe77f HW	215	unsigned int hooknum,
	216	const struct sk_buff *skb,
	217	const struct net_device *in,
	218	const struct net_device *out,
7b2f9631	219	const struct nf_loginfo *loginfo,
f6ebe77f HW	220	const char *fmt, ...)
	221	{
	222	va_list args;
	223	char prefix[NF_LOG_PREFIXLEN];
7b2f9631	224	const struct nf_logger *logger;
601e68e1	225
f6ebe77f	226	rcu_read_lock();
fab4085f PNA	227	if (loginfo != NULL)
	228	logger = rcu_dereference(loggers[pf][loginfo->type]);
	229	else
	230	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	231
f6ebe77f HW	232	if (logger) {
	233	va_start(args, fmt);
	234	vsnprintf(prefix, sizeof(prefix), fmt, args);
	235	va_end(args);
8cdb46da	236	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
f6ebe77f HW	237	}
	238	rcu_read_unlock();
	239	}
	240	EXPORT_SYMBOL(nf_log_packet);
	241
4017a7ee PNA	242	void nf_log_trace(struct net *net,
	243	u_int8_t pf,
	244	unsigned int hooknum,
	245	const struct sk_buff *skb,
	246	const struct net_device *in,
	247	const struct net_device *out,
	248	const struct nf_loginfo loginfo, const char fmt, ...)
	249	{
	250	va_list args;
	251	char prefix[NF_LOG_PREFIXLEN];
	252	const struct nf_logger *logger;
	253
	254	rcu_read_lock();
	255	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	256	if (logger) {
	257	va_start(args, fmt);
	258	vsnprintf(prefix, sizeof(prefix), fmt, args);
	259	va_end(args);
	260	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
	261	}
	262	rcu_read_unlock();
	263	}
	264	EXPORT_SYMBOL(nf_log_trace);
	265
27fd8d90 PNA	266	#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
	267
	268	struct nf_log_buf {
	269	unsigned int count;
	270	char buf[S_SIZE + 1];
	271	};
	272	static struct nf_log_buf emergency, *emergency_ptr = &emergency;
	273
	274	__printf(2, 3) int nf_log_buf_add(struct nf_log_buf m, const char f, ...)
	275	{
	276	va_list args;
	277	int len;
	278
	279	if (likely(m->count < S_SIZE)) {
	280	va_start(args, f);
	281	len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
	282	va_end(args);
	283	if (likely(m->count + len < S_SIZE)) {
	284	m->count += len;
	285	return 0;
	286	}
	287	}
	288	m->count = S_SIZE;
	289	printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
	290	return -1;
	291	}
	292	EXPORT_SYMBOL_GPL(nf_log_buf_add);
	293
	294	struct nf_log_buf *nf_log_buf_open(void)
	295	{
	296	struct nf_log_buf m = kmalloc(sizeof(m), GFP_ATOMIC);
	297
	298	if (unlikely(!m)) {
	299	local_bh_disable();
	300	do {
	301	m = xchg(&emergency_ptr, NULL);
	302	} while (!m);
	303	}
	304	m->count = 0;
	305	return m;
	306	}
	307	EXPORT_SYMBOL_GPL(nf_log_buf_open);
	308
	309	void nf_log_buf_close(struct nf_log_buf *m)
	310	{
	311	m->buf[m->count] = 0;
	312	printk("%s\n", m->buf);
	313
	314	if (likely(m != &emergency))
	315	kfree(m);
	316	else {
	317	emergency_ptr = m;
	318	local_bh_enable();
	319	}
	320	}
	321	EXPORT_SYMBOL_GPL(nf_log_buf_close);
	322
f6ebe77f HW	323	#ifdef CONFIG_PROC_FS
	324	static void seq_start(struct seq_file seq, loff_t *pos)
	325	{
30e0c6a6 G	326	struct net *net = seq_file_net(seq);
30e0c6a6 G	327
6440fe05	328	mutex_lock(&nf_log_mutex);
f6ebe77f	329
30e0c6a6	330	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	331	return NULL;
	332
	333	return pos;
	334	}
	335
	336	static void seq_next(struct seq_file s, void v, loff_t pos)
	337	{
30e0c6a6 G	338	struct net *net = seq_file_net(s);
30e0c6a6 G	339
f6ebe77f HW	340	(*pos)++;
f6ebe77f HW	341
30e0c6a6	342	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	343	return NULL;
	344
	345	return pos;
	346	}
	347
	348	static void seq_stop(struct seq_file s, void v)
	349	{
6440fe05	350	mutex_unlock(&nf_log_mutex);
f6ebe77f HW	351	}
	352
	353	static int seq_show(struct seq_file s, void v)
	354	{
	355	loff_t *pos = v;
	356	const struct nf_logger *logger;
e71456ae	357	int i;
30e0c6a6	358	struct net *net = seq_file_net(s);
f6ebe77f	359
0c26ed1c	360	logger = nft_log_dereference(net->nf.nf_loggers[*pos]);
f6ebe77f HW	361
f6ebe77f HW	362	if (!logger)
e71456ae	363	seq_printf(s, "%2lld NONE (", *pos);
c7a913cd	364	else
e71456ae	365	seq_printf(s, "%2lld %s (", *pos, logger->name);
c7a913cd	366
e71456ae SRRH	367	if (seq_has_overflowed(s))
e71456ae SRRH	368	return -ENOSPC;
c7a913cd	369
5962815a PNA	370	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	371	if (loggers[*pos][i] == NULL)
	372	continue;
	373
0c26ed1c	374	logger = nft_log_dereference(loggers[*pos][i]);
e71456ae SRRH	375	seq_printf(s, "%s", logger->name);
	376	if (i == 0 && loggers[*pos][i + 1] != NULL)
	377	seq_printf(s, ",");
	378
	379	if (seq_has_overflowed(s))
	380	return -ENOSPC;
c7a913cd	381	}
601e68e1	382
e71456ae SRRH	383	seq_printf(s, ")\n");
	384
	385	if (seq_has_overflowed(s))
	386	return -ENOSPC;
	387	return 0;
f6ebe77f HW	388	}
f6ebe77f HW	389
56b3d975	390	static const struct seq_operations nflog_seq_ops = {
f6ebe77f HW	391	.start = seq_start,
	392	.next = seq_next,
	393	.stop = seq_stop,
	394	.show = seq_show,
	395	};
	396
	397	static int nflog_open(struct inode inode, struct file file)
	398	{
30e0c6a6 G	399	return seq_open_net(inode, file, &nflog_seq_ops,
30e0c6a6 G	400	sizeof(struct seq_net_private));
f6ebe77f HW	401	}
f6ebe77f HW	402
da7071d7	403	static const struct file_operations nflog_file_ops = {
f6ebe77f HW	404	.owner = THIS_MODULE,
	405	.open = nflog_open,
	406	.read = seq_read,
	407	.llseek = seq_lseek,
30e0c6a6	408	.release = seq_release_net,
f6ebe77f HW	409	};
f6ebe77f HW	410
17625274	411
f6ebe77f HW	412	#endif /* PROC_FS */
f6ebe77f HW	413
17625274	414	#ifdef CONFIG_SYSCTL
17625274 EL	415	static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
17625274 EL	416	static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
f6ebe77f	417
fe2c6338	418	static int nf_log_proc_dostring(struct ctl_table *table, int write,
24955619	419	void __user buffer, size_t lenp, loff_t *ppos)
17625274 EL	420	{
17625274 EL	421	const struct nf_logger *logger;
24955619	422	char buf[NFLOGGER_NAME_LEN];
17625274 EL	423	int r = 0;
17625274 EL	424	int tindex = (unsigned long)table->extra1;
30e0c6a6	425	struct net *net = current->nsproxy->net_ns;
17625274 EL	426
17625274 EL	427	if (write) {
c6ac37d8 PT	428	struct ctl_table tmp = *table;
	429
	430	tmp.data = buf;
	431	r = proc_dostring(&tmp, write, buffer, lenp, ppos);
	432	if (r)
	433	return r;
24955619 PM	434
24955619 PM	435	if (!strcmp(buf, "NONE")) {
30e0c6a6	436	nf_log_unbind_pf(net, tindex);
17625274 EL	437	return 0;
	438	}
	439	mutex_lock(&nf_log_mutex);
24955619	440	logger = __find_logger(tindex, buf);
17625274 EL	441	if (logger == NULL) {
	442	mutex_unlock(&nf_log_mutex);
	443	return -ENOENT;
	444	}
30e0c6a6	445	rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
17625274 EL	446	mutex_unlock(&nf_log_mutex);
17625274 EL	447	} else {
266d07cb	448	mutex_lock(&nf_log_mutex);
0c26ed1c	449	logger = nft_log_dereference(net->nf.nf_loggers[tindex]);
17625274 EL	450	if (!logger)
	451	table->data = "NONE";
	452	else
	453	table->data = logger->name;
8d65af78	454	r = proc_dostring(table, write, buffer, lenp, ppos);
266d07cb	455	mutex_unlock(&nf_log_mutex);
17625274 EL	456	}
	457
	458	return r;
	459	}
	460
30e0c6a6	461	static int netfilter_log_sysctl_init(struct net *net)
f6ebe77f	462	{
ca735b3a	463	int i;
30e0c6a6 G	464	struct ctl_table *table;
	465
	466	table = nf_log_sysctl_table;
	467	if (!net_eq(net, &init_net)) {
	468	table = kmemdup(nf_log_sysctl_table,
	469	sizeof(nf_log_sysctl_table),
	470	GFP_KERNEL);
	471	if (!table)
	472	goto err_alloc;
	473	} else {
	474	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	475	snprintf(nf_log_sysctl_fnames[i],
	476	3, "%d", i);
	477	nf_log_sysctl_table[i].procname =
	478	nf_log_sysctl_fnames[i];
	479	nf_log_sysctl_table[i].data = NULL;
8aefc4d1	480	nf_log_sysctl_table[i].maxlen = NFLOGGER_NAME_LEN;
30e0c6a6 G	481	nf_log_sysctl_table[i].mode = 0644;
	482	nf_log_sysctl_table[i].proc_handler =
	483	nf_log_proc_dostring;
	484	nf_log_sysctl_table[i].extra1 =
	485	(void *)(unsigned long) i;
	486	}
17625274 EL	487	}
17625274 EL	488
30e0c6a6 G	489	net->nf.nf_log_dir_header = register_net_sysctl(net,
	490	"net/netfilter/nf_log",
	491	table);
	492	if (!net->nf.nf_log_dir_header)
	493	goto err_reg;
17625274 EL	494
17625274 EL	495	return 0;
30e0c6a6 G	496
	497	err_reg:
	498	if (!net_eq(net, &init_net))
	499	kfree(table);
	500	err_alloc:
	501	return -ENOMEM;
	502	}
	503
	504	static void netfilter_log_sysctl_exit(struct net *net)
	505	{
	506	struct ctl_table *table;
	507
	508	table = net->nf.nf_log_dir_header->ctl_table_arg;
	509	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
	510	if (!net_eq(net, &init_net))
	511	kfree(table);
17625274 EL	512	}
17625274 EL	513	#else
30e0c6a6	514	static int netfilter_log_sysctl_init(struct net *net)
17625274 EL	515	{
	516	return 0;
	517	}
30e0c6a6 G	518
	519	static void netfilter_log_sysctl_exit(struct net *net)
	520	{
	521	}
17625274 EL	522	#endif /* CONFIG_SYSCTL */
17625274 EL	523
30e0c6a6	524	static int __net_init nf_log_net_init(struct net *net)
17625274	525	{
30e0c6a6 G	526	int ret = -ENOMEM;
30e0c6a6 G	527
f6ebe77f	528	#ifdef CONFIG_PROC_FS
8eeee8b1	529	if (!proc_create("nf_log", S_IRUGO,
30e0c6a6 G	530	net->nf.proc_netfilter, &nflog_file_ops))
30e0c6a6 G	531	return ret;
62243927	532	#endif
30e0c6a6 G	533	ret = netfilter_log_sysctl_init(net);
	534	if (ret < 0)
	535	goto out_sysctl;
ca735b3a	536
30e0c6a6 G	537	return 0;
	538
	539	out_sysctl:
e778f56e	540	#ifdef CONFIG_PROC_FS
6d11cfdb	541	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	542	#endif
30e0c6a6 G	543	return ret;
	544	}
	545
	546	static void __net_exit nf_log_net_exit(struct net *net)
	547	{
	548	netfilter_log_sysctl_exit(net);
e778f56e	549	#ifdef CONFIG_PROC_FS
30e0c6a6	550	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	551	#endif
30e0c6a6 G	552	}
	553
	554	static struct pernet_operations nf_log_net_ops = {
	555	.init = nf_log_net_init,
	556	.exit = nf_log_net_exit,
	557	};
	558
	559	int __init netfilter_log_init(void)
	560	{
5962815a	561	return register_pernet_subsys(&nf_log_net_ops);
f6ebe77f	562	}