[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);

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

	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;

	mutex_lock(&nf_log_mutex);

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

	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++)
		RCU_INIT_POINTER(loggers[i][logger->type], NULL);
	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_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;

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

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

	if (logger && 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;

	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);

#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, 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;

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

		logger = rcu_dereference_protected(loggers[*pos][i],
					   lockdep_is_held(&nf_log_mutex));
		ret = seq_printf(s, "%s", logger->name);
		if (ret < 0)
			return ret;
		if (i == 0 && loggers[*pos][i + 1] != NULL) {
			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(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];
	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:
#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
ca735b3a	22	static struct nf_logger __find_logger(int pf, const char str_logger)
f6ebe77f	23	{
5962815a PNA	24	struct nf_logger *log;
	25	int i;
	26
	27	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	28	if (loggers[pf][i] == NULL)
	29	continue;
f6ebe77f	30
5962815a PNA	31	log = rcu_dereference_protected(loggers[pf][i],
5962815a PNA	32	lockdep_is_held(&nf_log_mutex));
18082746	33	if (!strncasecmp(str_logger, log->name, strlen(log->name)))
5962815a	34	return log;
ca735b3a	35	}
d72367b6	36
ca735b3a	37	return NULL;
601e68e1	38	}
f6ebe77f	39
30e0c6a6 G	40	void nf_log_set(struct net net, u_int8_t pf, const struct nf_logger logger)
	41	{
	42	const struct nf_logger *log;
	43
30e0c6a6 G	44	if (pf == NFPROTO_UNSPEC)
	45	return;
	46
	47	mutex_lock(&nf_log_mutex);
	48	log = rcu_dereference_protected(net->nf.nf_loggers[pf],
	49	lockdep_is_held(&nf_log_mutex));
	50	if (log == NULL)
	51	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
	52
	53	mutex_unlock(&nf_log_mutex);
	54	}
	55	EXPORT_SYMBOL(nf_log_set);
	56
	57	void nf_log_unset(struct net net, const struct nf_logger logger)
	58	{
	59	int i;
	60	const struct nf_logger *log;
	61
30e0c6a6 G	62	mutex_lock(&nf_log_mutex);
	63	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
	64	log = rcu_dereference_protected(net->nf.nf_loggers[i],
	65	lockdep_is_held(&nf_log_mutex));
	66	if (log == logger)
	67	RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
	68	}
	69	mutex_unlock(&nf_log_mutex);
	70	synchronize_rcu();
	71	}
	72	EXPORT_SYMBOL(nf_log_unset);
	73
d93cf068	74	/* return EEXIST if the same logger is registered, 0 on success. */
ca735b3a	75	int nf_log_register(u_int8_t pf, struct nf_logger *logger)
f6ebe77f	76	{
b6f0a365	77	int i;
ca735b3a	78
30e0c6a6	79	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
ca735b3a EL	80	return -EINVAL;
ca735b3a EL	81
9b73534d	82	mutex_lock(&nf_log_mutex);
ca735b3a EL	83
ca735b3a EL	84	if (pf == NFPROTO_UNSPEC) {
ca735b3a	85	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
5962815a	86	rcu_assign_pointer(loggers[i][logger->type], logger);
ca735b3a EL	87	} else {
ca735b3a EL	88	/* register at end of list to honor first register win */
5962815a	89	rcu_assign_pointer(loggers[pf][logger->type], logger);
ca735b3a EL	90	}
ca735b3a EL	91
9b73534d	92	mutex_unlock(&nf_log_mutex);
f6ebe77f	93
ca735b3a	94	return 0;
f6ebe77f	95	}
ca735b3a	96	EXPORT_SYMBOL(nf_log_register);
f6ebe77f	97
ca735b3a	98	void nf_log_unregister(struct nf_logger *logger)
f6ebe77f HW	99	{
	100	int i;
	101
9b73534d	102	mutex_lock(&nf_log_mutex);
30e0c6a6	103	for (i = 0; i < NFPROTO_NUMPROTO; i++)
5962815a	104	RCU_INIT_POINTER(loggers[i][logger->type], NULL);
9b73534d	105	mutex_unlock(&nf_log_mutex);
f6ebe77f	106	}
e92ad99c	107	EXPORT_SYMBOL(nf_log_unregister);
f6ebe77f	108
30e0c6a6 G	109	int nf_log_bind_pf(struct net *net, u_int8_t pf,
30e0c6a6 G	110	const struct nf_logger *logger)
ca735b3a	111	{
30e0c6a6	112	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	113	return -EINVAL;
ca735b3a EL	114	mutex_lock(&nf_log_mutex);
	115	if (__find_logger(pf, logger->name) == NULL) {
	116	mutex_unlock(&nf_log_mutex);
	117	return -ENOENT;
	118	}
30e0c6a6	119	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
ca735b3a EL	120	mutex_unlock(&nf_log_mutex);
	121	return 0;
	122	}
	123	EXPORT_SYMBOL(nf_log_bind_pf);
	124
30e0c6a6	125	void nf_log_unbind_pf(struct net *net, u_int8_t pf)
ca735b3a	126	{
30e0c6a6	127	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	128	return;
ca735b3a	129	mutex_lock(&nf_log_mutex);
30e0c6a6	130	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
ca735b3a EL	131	mutex_unlock(&nf_log_mutex);
	132	}
	133	EXPORT_SYMBOL(nf_log_unbind_pf);
	134
960649d1 PNA	135	void nf_logger_request_module(int pf, enum nf_log_type type)
	136	{
	137	if (loggers[pf][type] == NULL)
	138	request_module("nf-logger-%u-%u", pf, type);
	139	}
	140	EXPORT_SYMBOL_GPL(nf_logger_request_module);
	141
fab4085f PNA	142	int nf_logger_find_get(int pf, enum nf_log_type type)
	143	{
	144	struct nf_logger *logger;
	145	int ret = -ENOENT;
	146
	147	logger = loggers[pf][type];
	148	if (logger == NULL)
	149	request_module("nf-logger-%u-%u", pf, type);
	150
	151	rcu_read_lock();
	152	logger = rcu_dereference(loggers[pf][type]);
	153	if (logger == NULL)
	154	goto out;
	155
	156	if (logger && try_module_get(logger->me))
	157	ret = 0;
	158	out:
	159	rcu_read_unlock();
	160	return ret;
	161	}
	162	EXPORT_SYMBOL_GPL(nf_logger_find_get);
	163
	164	void nf_logger_put(int pf, enum nf_log_type type)
	165	{
	166	struct nf_logger *logger;
	167
	168	BUG_ON(loggers[pf][type] == NULL);
	169
	170	rcu_read_lock();
	171	logger = rcu_dereference(loggers[pf][type]);
	172	module_put(logger->me);
	173	rcu_read_unlock();
	174	}
	175	EXPORT_SYMBOL_GPL(nf_logger_put);
	176
30e0c6a6 G	177	void nf_log_packet(struct net *net,
30e0c6a6 G	178	u_int8_t pf,
f6ebe77f HW	179	unsigned int hooknum,
	180	const struct sk_buff *skb,
	181	const struct net_device *in,
	182	const struct net_device *out,
7b2f9631	183	const struct nf_loginfo *loginfo,
f6ebe77f HW	184	const char *fmt, ...)
	185	{
	186	va_list args;
	187	char prefix[NF_LOG_PREFIXLEN];
7b2f9631	188	const struct nf_logger *logger;
601e68e1	189
f6ebe77f	190	rcu_read_lock();
fab4085f PNA	191	if (loginfo != NULL)
	192	logger = rcu_dereference(loggers[pf][loginfo->type]);
	193	else
	194	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	195
f6ebe77f HW	196	if (logger) {
	197	va_start(args, fmt);
	198	vsnprintf(prefix, sizeof(prefix), fmt, args);
	199	va_end(args);
8cdb46da	200	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
f6ebe77f HW	201	}
	202	rcu_read_unlock();
	203	}
	204	EXPORT_SYMBOL(nf_log_packet);
	205
27fd8d90 PNA	206	#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
	207
	208	struct nf_log_buf {
	209	unsigned int count;
	210	char buf[S_SIZE + 1];
	211	};
	212	static struct nf_log_buf emergency, *emergency_ptr = &emergency;
	213
	214	__printf(2, 3) int nf_log_buf_add(struct nf_log_buf m, const char f, ...)
	215	{
	216	va_list args;
	217	int len;
	218
	219	if (likely(m->count < S_SIZE)) {
	220	va_start(args, f);
	221	len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
	222	va_end(args);
	223	if (likely(m->count + len < S_SIZE)) {
	224	m->count += len;
	225	return 0;
	226	}
	227	}
	228	m->count = S_SIZE;
	229	printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
	230	return -1;
	231	}
	232	EXPORT_SYMBOL_GPL(nf_log_buf_add);
	233
	234	struct nf_log_buf *nf_log_buf_open(void)
	235	{
	236	struct nf_log_buf m = kmalloc(sizeof(m), GFP_ATOMIC);
	237
	238	if (unlikely(!m)) {
	239	local_bh_disable();
	240	do {
	241	m = xchg(&emergency_ptr, NULL);
	242	} while (!m);
	243	}
	244	m->count = 0;
	245	return m;
	246	}
	247	EXPORT_SYMBOL_GPL(nf_log_buf_open);
	248
	249	void nf_log_buf_close(struct nf_log_buf *m)
	250	{
	251	m->buf[m->count] = 0;
	252	printk("%s\n", m->buf);
	253
	254	if (likely(m != &emergency))
	255	kfree(m);
	256	else {
	257	emergency_ptr = m;
	258	local_bh_enable();
	259	}
	260	}
	261	EXPORT_SYMBOL_GPL(nf_log_buf_close);
	262
f6ebe77f HW	263	#ifdef CONFIG_PROC_FS
	264	static void seq_start(struct seq_file seq, loff_t *pos)
	265	{
30e0c6a6 G	266	struct net *net = seq_file_net(seq);
30e0c6a6 G	267
6440fe05	268	mutex_lock(&nf_log_mutex);
f6ebe77f	269
30e0c6a6	270	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	271	return NULL;
	272
	273	return pos;
	274	}
	275
	276	static void seq_next(struct seq_file s, void v, loff_t pos)
	277	{
30e0c6a6 G	278	struct net *net = seq_file_net(s);
30e0c6a6 G	279
f6ebe77f HW	280	(*pos)++;
f6ebe77f HW	281
30e0c6a6	282	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	283	return NULL;
	284
	285	return pos;
	286	}
	287
	288	static void seq_stop(struct seq_file s, void v)
	289	{
6440fe05	290	mutex_unlock(&nf_log_mutex);
f6ebe77f HW	291	}
	292
	293	static int seq_show(struct seq_file s, void v)
	294	{
	295	loff_t *pos = v;
	296	const struct nf_logger *logger;
5962815a	297	int i, ret;
30e0c6a6	298	struct net *net = seq_file_net(s);
f6ebe77f	299
30e0c6a6	300	logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
0e60ebe0	301	lockdep_is_held(&nf_log_mutex));
f6ebe77f HW	302
f6ebe77f HW	303	if (!logger)
c7a913cd EL	304	ret = seq_printf(s, "%2lld NONE (", *pos);
	305	else
	306	ret = seq_printf(s, "%2lld %s (", *pos, logger->name);
	307
	308	if (ret < 0)
	309	return ret;
	310
5962815a PNA	311	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	312	if (loggers[*pos][i] == NULL)
	313	continue;
	314
	315	logger = rcu_dereference_protected(loggers[*pos][i],
	316	lockdep_is_held(&nf_log_mutex));
	317	ret = seq_printf(s, "%s", logger->name);
6440fe05	318	if (ret < 0)
c7a913cd	319	return ret;
5962815a	320	if (i == 0 && loggers[*pos][i + 1] != NULL) {
c7a913cd	321	ret = seq_printf(s, ",");
6440fe05	322	if (ret < 0)
c7a913cd	323	return ret;
c7a913cd EL	324	}
c7a913cd EL	325	}
601e68e1	326
c7a913cd	327	return seq_printf(s, ")\n");
f6ebe77f HW	328	}
f6ebe77f HW	329
56b3d975	330	static const struct seq_operations nflog_seq_ops = {
f6ebe77f HW	331	.start = seq_start,
	332	.next = seq_next,
	333	.stop = seq_stop,
	334	.show = seq_show,
	335	};
	336
	337	static int nflog_open(struct inode inode, struct file file)
	338	{
30e0c6a6 G	339	return seq_open_net(inode, file, &nflog_seq_ops,
30e0c6a6 G	340	sizeof(struct seq_net_private));
f6ebe77f HW	341	}
f6ebe77f HW	342
da7071d7	343	static const struct file_operations nflog_file_ops = {
f6ebe77f HW	344	.owner = THIS_MODULE,
	345	.open = nflog_open,
	346	.read = seq_read,
	347	.llseek = seq_lseek,
30e0c6a6	348	.release = seq_release_net,
f6ebe77f HW	349	};
f6ebe77f HW	350
17625274	351
f6ebe77f HW	352	#endif /* PROC_FS */
f6ebe77f HW	353
17625274	354	#ifdef CONFIG_SYSCTL
17625274 EL	355	static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
17625274 EL	356	static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
f6ebe77f	357
fe2c6338	358	static int nf_log_proc_dostring(struct ctl_table *table, int write,
24955619	359	void __user buffer, size_t lenp, loff_t *ppos)
17625274 EL	360	{
17625274 EL	361	const struct nf_logger *logger;
24955619 PM	362	char buf[NFLOGGER_NAME_LEN];
24955619 PM	363	size_t size = *lenp;
17625274 EL	364	int r = 0;
17625274 EL	365	int tindex = (unsigned long)table->extra1;
30e0c6a6	366	struct net *net = current->nsproxy->net_ns;
17625274 EL	367
17625274 EL	368	if (write) {
24955619 PM	369	if (size > sizeof(buf))
	370	size = sizeof(buf);
	371	if (copy_from_user(buf, buffer, size))
	372	return -EFAULT;
	373
	374	if (!strcmp(buf, "NONE")) {
30e0c6a6	375	nf_log_unbind_pf(net, tindex);
17625274 EL	376	return 0;
	377	}
	378	mutex_lock(&nf_log_mutex);
24955619	379	logger = __find_logger(tindex, buf);
17625274 EL	380	if (logger == NULL) {
	381	mutex_unlock(&nf_log_mutex);
	382	return -ENOENT;
	383	}
30e0c6a6	384	rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
17625274 EL	385	mutex_unlock(&nf_log_mutex);
17625274 EL	386	} else {
266d07cb	387	mutex_lock(&nf_log_mutex);
30e0c6a6	388	logger = rcu_dereference_protected(net->nf.nf_loggers[tindex],
0e60ebe0	389	lockdep_is_held(&nf_log_mutex));
17625274 EL	390	if (!logger)
	391	table->data = "NONE";
	392	else
	393	table->data = logger->name;
8d65af78	394	r = proc_dostring(table, write, buffer, lenp, ppos);
266d07cb	395	mutex_unlock(&nf_log_mutex);
17625274 EL	396	}
	397
	398	return r;
	399	}
	400
30e0c6a6	401	static int netfilter_log_sysctl_init(struct net *net)
f6ebe77f	402	{
ca735b3a	403	int i;
30e0c6a6 G	404	struct ctl_table *table;
	405
	406	table = nf_log_sysctl_table;
	407	if (!net_eq(net, &init_net)) {
	408	table = kmemdup(nf_log_sysctl_table,
	409	sizeof(nf_log_sysctl_table),
	410	GFP_KERNEL);
	411	if (!table)
	412	goto err_alloc;
	413	} else {
	414	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	415	snprintf(nf_log_sysctl_fnames[i],
	416	3, "%d", i);
	417	nf_log_sysctl_table[i].procname =
	418	nf_log_sysctl_fnames[i];
	419	nf_log_sysctl_table[i].data = NULL;
	420	nf_log_sysctl_table[i].maxlen =
	421	NFLOGGER_NAME_LEN * sizeof(char);
	422	nf_log_sysctl_table[i].mode = 0644;
	423	nf_log_sysctl_table[i].proc_handler =
	424	nf_log_proc_dostring;
	425	nf_log_sysctl_table[i].extra1 =
	426	(void *)(unsigned long) i;
	427	}
17625274 EL	428	}
17625274 EL	429
30e0c6a6 G	430	net->nf.nf_log_dir_header = register_net_sysctl(net,
	431	"net/netfilter/nf_log",
	432	table);
	433	if (!net->nf.nf_log_dir_header)
	434	goto err_reg;
17625274 EL	435
17625274 EL	436	return 0;
30e0c6a6 G	437
	438	err_reg:
	439	if (!net_eq(net, &init_net))
	440	kfree(table);
	441	err_alloc:
	442	return -ENOMEM;
	443	}
	444
	445	static void netfilter_log_sysctl_exit(struct net *net)
	446	{
	447	struct ctl_table *table;
	448
	449	table = net->nf.nf_log_dir_header->ctl_table_arg;
	450	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
	451	if (!net_eq(net, &init_net))
	452	kfree(table);
17625274 EL	453	}
17625274 EL	454	#else
30e0c6a6	455	static int netfilter_log_sysctl_init(struct net *net)
17625274 EL	456	{
	457	return 0;
	458	}
30e0c6a6 G	459
	460	static void netfilter_log_sysctl_exit(struct net *net)
	461	{
	462	}
17625274 EL	463	#endif /* CONFIG_SYSCTL */
17625274 EL	464
30e0c6a6	465	static int __net_init nf_log_net_init(struct net *net)
17625274	466	{
30e0c6a6 G	467	int ret = -ENOMEM;
30e0c6a6 G	468
f6ebe77f	469	#ifdef CONFIG_PROC_FS
8eeee8b1	470	if (!proc_create("nf_log", S_IRUGO,
30e0c6a6 G	471	net->nf.proc_netfilter, &nflog_file_ops))
30e0c6a6 G	472	return ret;
62243927	473	#endif
30e0c6a6 G	474	ret = netfilter_log_sysctl_init(net);
	475	if (ret < 0)
	476	goto out_sysctl;
ca735b3a	477
30e0c6a6 G	478	return 0;
	479
	480	out_sysctl:
e778f56e	481	#ifdef CONFIG_PROC_FS
6d11cfdb	482	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	483	#endif
30e0c6a6 G	484	return ret;
	485	}
	486
	487	static void __net_exit nf_log_net_exit(struct net *net)
	488	{
	489	netfilter_log_sysctl_exit(net);
e778f56e	490	#ifdef CONFIG_PROC_FS
30e0c6a6	491	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	492	#endif
30e0c6a6 G	493	}
	494
	495	static struct pernet_operations nf_log_net_ops = {
	496	.init = nf_log_net_init,
	497	.exit = nf_log_net_exit,
	498	};
	499
	500	int __init netfilter_log_init(void)
	501	{
5962815a	502	return register_pernet_subsys(&nf_log_net_ops);
f6ebe77f	503	}