[linux-2.6-block.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;
}

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 = 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);
}
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 (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 (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);

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