[mirror_ubuntu-artful-kernel.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 NFLOGGER_NAME_LEN		64

int sysctl_nf_log_all_netns __read_mostly;
EXPORT_SYMBOL(sysctl_nf_log_all_netns);

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);
}
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_puts(s, ",");

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

	seq_puts(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 struct ctl_table_header *nf_log_sysctl_fhdr;

static struct ctl_table nf_log_sysctl_ftable[] = {
	{
		.procname	= "nf_log_all_netns",
		.data		= &sysctl_nf_log_all_netns,
		.maxlen		= sizeof(sysctl_nf_log_all_netns),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

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 = table->extra2;

	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].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;
		}
		nf_log_sysctl_fhdr = register_net_sysctl(net, "net/netfilter",
							 nf_log_sysctl_ftable);
		if (!nf_log_sysctl_fhdr)
			goto err_freg;
	}

	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);
	else
		unregister_net_sysctl_table(nf_log_sysctl_fhdr);
err_freg:
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
		unregister_net_sysctl_table(nf_log_sysctl_fhdr);
}
#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 */
f6ebe77f HW	15
17625274	16	#define NFLOGGER_NAME_LEN 64
f6ebe77f	17
2851940f MK	18	int sysctl_nf_log_all_netns __read_mostly;
	19	EXPORT_SYMBOL(sysctl_nf_log_all_netns);
	20
5962815a	21	static struct nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __read_mostly;
9b73534d	22	static DEFINE_MUTEX(nf_log_mutex);
f6ebe77f	23
0c26ed1c ML	24	#define nft_log_dereference(logger) \
	25	rcu_dereference_protected(logger, lockdep_is_held(&nf_log_mutex))
	26
ca735b3a	27	static struct nf_logger __find_logger(int pf, const char str_logger)
f6ebe77f	28	{
5962815a PNA	29	struct nf_logger *log;
	30	int i;
	31
	32	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	33	if (loggers[pf][i] == NULL)
	34	continue;
f6ebe77f	35
0c26ed1c	36	log = nft_log_dereference(loggers[pf][i]);
18082746	37	if (!strncasecmp(str_logger, log->name, strlen(log->name)))
5962815a	38	return log;
ca735b3a	39	}
d72367b6	40
ca735b3a	41	return NULL;
601e68e1	42	}
f6ebe77f	43
779994fa	44	int nf_log_set(struct net net, u_int8_t pf, const struct nf_logger logger)
30e0c6a6 G	45	{
	46	const struct nf_logger *log;
	47
779994fa GF	48	if (pf == NFPROTO_UNSPEC \|\| pf >= ARRAY_SIZE(net->nf.nf_loggers))
779994fa GF	49	return -EOPNOTSUPP;
30e0c6a6 G	50
30e0c6a6 G	51	mutex_lock(&nf_log_mutex);
0c26ed1c	52	log = nft_log_dereference(net->nf.nf_loggers[pf]);
30e0c6a6 G	53	if (log == NULL)
	54	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
	55
	56	mutex_unlock(&nf_log_mutex);
779994fa GF	57
779994fa GF	58	return 0;
30e0c6a6 G	59	}
	60	EXPORT_SYMBOL(nf_log_set);
	61
	62	void nf_log_unset(struct net net, const struct nf_logger logger)
	63	{
	64	int i;
	65	const struct nf_logger *log;
	66
30e0c6a6 G	67	mutex_lock(&nf_log_mutex);
30e0c6a6 G	68	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
0c26ed1c	69	log = nft_log_dereference(net->nf.nf_loggers[i]);
30e0c6a6 G	70	if (log == logger)
	71	RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL);
	72	}
	73	mutex_unlock(&nf_log_mutex);
30e0c6a6 G	74	}
	75	EXPORT_SYMBOL(nf_log_unset);
	76
d93cf068	77	/* return EEXIST if the same logger is registered, 0 on success. */
ca735b3a	78	int nf_log_register(u_int8_t pf, struct nf_logger *logger)
f6ebe77f	79	{
b6f0a365	80	int i;
8ac2bde2	81	int ret = 0;
ca735b3a	82
30e0c6a6	83	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
ca735b3a EL	84	return -EINVAL;
ca735b3a EL	85
9b73534d	86	mutex_lock(&nf_log_mutex);
ca735b3a EL	87
ca735b3a EL	88	if (pf == NFPROTO_UNSPEC) {
8ac2bde2 ML	89	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	90	if (rcu_access_pointer(loggers[i][logger->type])) {
	91	ret = -EEXIST;
	92	goto unlock;
	93	}
	94	}
ca735b3a	95	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
5962815a	96	rcu_assign_pointer(loggers[i][logger->type], logger);
ca735b3a	97	} else {
8ac2bde2 ML	98	if (rcu_access_pointer(loggers[pf][logger->type])) {
	99	ret = -EEXIST;
	100	goto unlock;
	101	}
5962815a	102	rcu_assign_pointer(loggers[pf][logger->type], logger);
ca735b3a EL	103	}
ca735b3a EL	104
8ac2bde2	105	unlock:
9b73534d	106	mutex_unlock(&nf_log_mutex);
8ac2bde2	107	return ret;
f6ebe77f	108	}
ca735b3a	109	EXPORT_SYMBOL(nf_log_register);
f6ebe77f	110
ca735b3a	111	void nf_log_unregister(struct nf_logger *logger)
f6ebe77f	112	{
205ee117	113	const struct nf_logger *log;
f6ebe77f HW	114	int i;
f6ebe77f HW	115
9b73534d	116	mutex_lock(&nf_log_mutex);
205ee117 FW	117	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
	118	log = nft_log_dereference(loggers[i][logger->type]);
	119	if (log == logger)
	120	RCU_INIT_POINTER(loggers[i][logger->type], NULL);
	121	}
9b73534d	122	mutex_unlock(&nf_log_mutex);
ad5001cc	123	synchronize_rcu();
f6ebe77f	124	}
e92ad99c	125	EXPORT_SYMBOL(nf_log_unregister);
f6ebe77f	126
30e0c6a6 G	127	int nf_log_bind_pf(struct net *net, u_int8_t pf,
30e0c6a6 G	128	const struct nf_logger *logger)
ca735b3a	129	{
30e0c6a6	130	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	131	return -EINVAL;
ca735b3a EL	132	mutex_lock(&nf_log_mutex);
	133	if (__find_logger(pf, logger->name) == NULL) {
	134	mutex_unlock(&nf_log_mutex);
	135	return -ENOENT;
	136	}
30e0c6a6	137	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
ca735b3a EL	138	mutex_unlock(&nf_log_mutex);
	139	return 0;
	140	}
	141	EXPORT_SYMBOL(nf_log_bind_pf);
	142
30e0c6a6	143	void nf_log_unbind_pf(struct net *net, u_int8_t pf)
ca735b3a	144	{
30e0c6a6	145	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	146	return;
ca735b3a	147	mutex_lock(&nf_log_mutex);
30e0c6a6	148	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
ca735b3a EL	149	mutex_unlock(&nf_log_mutex);
	150	}
	151	EXPORT_SYMBOL(nf_log_unbind_pf);
	152
960649d1 PNA	153	void nf_logger_request_module(int pf, enum nf_log_type type)
	154	{
	155	if (loggers[pf][type] == NULL)
	156	request_module("nf-logger-%u-%u", pf, type);
	157	}
	158	EXPORT_SYMBOL_GPL(nf_logger_request_module);
	159
fab4085f PNA	160	int nf_logger_find_get(int pf, enum nf_log_type type)
	161	{
	162	struct nf_logger *logger;
	163	int ret = -ENOENT;
	164
f3bb5333 LZ	165	if (pf == NFPROTO_INET) {
	166	ret = nf_logger_find_get(NFPROTO_IPV4, type);
	167	if (ret < 0)
	168	return ret;
	169
	170	ret = nf_logger_find_get(NFPROTO_IPV6, type);
	171	if (ret < 0) {
	172	nf_logger_put(NFPROTO_IPV4, type);
	173	return ret;
	174	}
	175
	176	return 0;
	177	}
	178
c5a589cc	179	if (rcu_access_pointer(loggers[pf][type]) == NULL)
fab4085f PNA	180	request_module("nf-logger-%u-%u", pf, type);
	181
	182	rcu_read_lock();
	183	logger = rcu_dereference(loggers[pf][type]);
	184	if (logger == NULL)
	185	goto out;
	186
7e53e7f8	187	if (try_module_get(logger->me))
fab4085f PNA	188	ret = 0;
	189	out:
	190	rcu_read_unlock();
	191	return ret;
	192	}
	193	EXPORT_SYMBOL_GPL(nf_logger_find_get);
	194
	195	void nf_logger_put(int pf, enum nf_log_type type)
	196	{
	197	struct nf_logger *logger;
	198
f3bb5333 LZ	199	if (pf == NFPROTO_INET) {
	200	nf_logger_put(NFPROTO_IPV4, type);
	201	nf_logger_put(NFPROTO_IPV6, type);
	202	return;
	203	}
	204
fab4085f PNA	205	BUG_ON(loggers[pf][type] == NULL);
	206
	207	rcu_read_lock();
	208	logger = rcu_dereference(loggers[pf][type]);
	209	module_put(logger->me);
	210	rcu_read_unlock();
	211	}
	212	EXPORT_SYMBOL_GPL(nf_logger_put);
	213
30e0c6a6 G	214	void nf_log_packet(struct net *net,
30e0c6a6 G	215	u_int8_t pf,
f6ebe77f HW	216	unsigned int hooknum,
	217	const struct sk_buff *skb,
	218	const struct net_device *in,
	219	const struct net_device *out,
7b2f9631	220	const struct nf_loginfo *loginfo,
f6ebe77f HW	221	const char *fmt, ...)
	222	{
	223	va_list args;
	224	char prefix[NF_LOG_PREFIXLEN];
7b2f9631	225	const struct nf_logger *logger;
601e68e1	226
f6ebe77f	227	rcu_read_lock();
fab4085f PNA	228	if (loginfo != NULL)
	229	logger = rcu_dereference(loggers[pf][loginfo->type]);
	230	else
	231	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	232
f6ebe77f HW	233	if (logger) {
	234	va_start(args, fmt);
	235	vsnprintf(prefix, sizeof(prefix), fmt, args);
	236	va_end(args);
8cdb46da	237	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
f6ebe77f HW	238	}
	239	rcu_read_unlock();
	240	}
	241	EXPORT_SYMBOL(nf_log_packet);
	242
4017a7ee PNA	243	void nf_log_trace(struct net *net,
	244	u_int8_t pf,
	245	unsigned int hooknum,
	246	const struct sk_buff *skb,
	247	const struct net_device *in,
	248	const struct net_device *out,
	249	const struct nf_loginfo loginfo, const char fmt, ...)
	250	{
	251	va_list args;
	252	char prefix[NF_LOG_PREFIXLEN];
	253	const struct nf_logger *logger;
	254
	255	rcu_read_lock();
	256	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	257	if (logger) {
	258	va_start(args, fmt);
	259	vsnprintf(prefix, sizeof(prefix), fmt, args);
	260	va_end(args);
	261	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
	262	}
	263	rcu_read_unlock();
	264	}
	265	EXPORT_SYMBOL(nf_log_trace);
	266
27fd8d90 PNA	267	#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
	268
	269	struct nf_log_buf {
	270	unsigned int count;
	271	char buf[S_SIZE + 1];
	272	};
	273	static struct nf_log_buf emergency, *emergency_ptr = &emergency;
	274
	275	__printf(2, 3) int nf_log_buf_add(struct nf_log_buf m, const char f, ...)
	276	{
	277	va_list args;
	278	int len;
	279
	280	if (likely(m->count < S_SIZE)) {
	281	va_start(args, f);
	282	len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
	283	va_end(args);
	284	if (likely(m->count + len < S_SIZE)) {
	285	m->count += len;
	286	return 0;
	287	}
	288	}
	289	m->count = S_SIZE;
	290	printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
	291	return -1;
	292	}
	293	EXPORT_SYMBOL_GPL(nf_log_buf_add);
	294
	295	struct nf_log_buf *nf_log_buf_open(void)
	296	{
	297	struct nf_log_buf m = kmalloc(sizeof(m), GFP_ATOMIC);
	298
	299	if (unlikely(!m)) {
	300	local_bh_disable();
	301	do {
	302	m = xchg(&emergency_ptr, NULL);
	303	} while (!m);
	304	}
	305	m->count = 0;
	306	return m;
	307	}
	308	EXPORT_SYMBOL_GPL(nf_log_buf_open);
	309
	310	void nf_log_buf_close(struct nf_log_buf *m)
	311	{
	312	m->buf[m->count] = 0;
	313	printk("%s\n", m->buf);
	314
	315	if (likely(m != &emergency))
	316	kfree(m);
	317	else {
	318	emergency_ptr = m;
	319	local_bh_enable();
	320	}
	321	}
	322	EXPORT_SYMBOL_GPL(nf_log_buf_close);
	323
f6ebe77f HW	324	#ifdef CONFIG_PROC_FS
	325	static void seq_start(struct seq_file seq, loff_t *pos)
	326	{
30e0c6a6 G	327	struct net *net = seq_file_net(seq);
30e0c6a6 G	328
6440fe05	329	mutex_lock(&nf_log_mutex);
f6ebe77f	330
30e0c6a6	331	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	332	return NULL;
	333
	334	return pos;
	335	}
	336
	337	static void seq_next(struct seq_file s, void v, loff_t pos)
	338	{
30e0c6a6 G	339	struct net *net = seq_file_net(s);
30e0c6a6 G	340
f6ebe77f HW	341	(*pos)++;
f6ebe77f HW	342
30e0c6a6	343	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	344	return NULL;
	345
	346	return pos;
	347	}
	348
	349	static void seq_stop(struct seq_file s, void v)
	350	{
6440fe05	351	mutex_unlock(&nf_log_mutex);
f6ebe77f HW	352	}
	353
	354	static int seq_show(struct seq_file s, void v)
	355	{
	356	loff_t *pos = v;
	357	const struct nf_logger *logger;
e71456ae	358	int i;
30e0c6a6	359	struct net *net = seq_file_net(s);
f6ebe77f	360
0c26ed1c	361	logger = nft_log_dereference(net->nf.nf_loggers[*pos]);
f6ebe77f HW	362
f6ebe77f HW	363	if (!logger)
e71456ae	364	seq_printf(s, "%2lld NONE (", *pos);
c7a913cd	365	else
e71456ae	366	seq_printf(s, "%2lld %s (", *pos, logger->name);
c7a913cd	367
e71456ae SRRH	368	if (seq_has_overflowed(s))
e71456ae SRRH	369	return -ENOSPC;
c7a913cd	370
5962815a PNA	371	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	372	if (loggers[*pos][i] == NULL)
	373	continue;
	374
0c26ed1c	375	logger = nft_log_dereference(loggers[*pos][i]);
e71456ae SRRH	376	seq_printf(s, "%s", logger->name);
e71456ae SRRH	377	if (i == 0 && loggers[*pos][i + 1] != NULL)
cdec2685	378	seq_puts(s, ",");
e71456ae SRRH	379
	380	if (seq_has_overflowed(s))
	381	return -ENOSPC;
c7a913cd	382	}
601e68e1	383
cdec2685	384	seq_puts(s, ")\n");
e71456ae SRRH	385
	386	if (seq_has_overflowed(s))
	387	return -ENOSPC;
	388	return 0;
f6ebe77f HW	389	}
f6ebe77f HW	390
56b3d975	391	static const struct seq_operations nflog_seq_ops = {
f6ebe77f HW	392	.start = seq_start,
	393	.next = seq_next,
	394	.stop = seq_stop,
	395	.show = seq_show,
	396	};
	397
	398	static int nflog_open(struct inode inode, struct file file)
	399	{
30e0c6a6 G	400	return seq_open_net(inode, file, &nflog_seq_ops,
30e0c6a6 G	401	sizeof(struct seq_net_private));
f6ebe77f HW	402	}
f6ebe77f HW	403
da7071d7	404	static const struct file_operations nflog_file_ops = {
f6ebe77f HW	405	.owner = THIS_MODULE,
	406	.open = nflog_open,
	407	.read = seq_read,
	408	.llseek = seq_lseek,
30e0c6a6	409	.release = seq_release_net,
f6ebe77f HW	410	};
f6ebe77f HW	411
17625274	412
f6ebe77f HW	413	#endif /* PROC_FS */
f6ebe77f HW	414
17625274	415	#ifdef CONFIG_SYSCTL
17625274 EL	416	static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
17625274 EL	417	static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
2851940f MK	418	static struct ctl_table_header *nf_log_sysctl_fhdr;
	419
	420	static struct ctl_table nf_log_sysctl_ftable[] = {
	421	{
	422	.procname = "nf_log_all_netns",
	423	.data = &sysctl_nf_log_all_netns,
	424	.maxlen = sizeof(sysctl_nf_log_all_netns),
	425	.mode = 0644,
	426	.proc_handler = proc_dointvec,
	427	},
	428	{ }
	429	};
f6ebe77f	430
fe2c6338	431	static int nf_log_proc_dostring(struct ctl_table *table, int write,
24955619	432	void __user buffer, size_t lenp, loff_t *ppos)
17625274 EL	433	{
17625274 EL	434	const struct nf_logger *logger;
24955619	435	char buf[NFLOGGER_NAME_LEN];
17625274 EL	436	int r = 0;
17625274 EL	437	int tindex = (unsigned long)table->extra1;
dbb5918c	438	struct net *net = table->extra2;
17625274 EL	439
17625274 EL	440	if (write) {
c6ac37d8 PT	441	struct ctl_table tmp = *table;
	442
	443	tmp.data = buf;
	444	r = proc_dostring(&tmp, write, buffer, lenp, ppos);
	445	if (r)
	446	return r;
24955619 PM	447
24955619 PM	448	if (!strcmp(buf, "NONE")) {
30e0c6a6	449	nf_log_unbind_pf(net, tindex);
17625274 EL	450	return 0;
	451	}
	452	mutex_lock(&nf_log_mutex);
24955619	453	logger = __find_logger(tindex, buf);
17625274 EL	454	if (logger == NULL) {
	455	mutex_unlock(&nf_log_mutex);
	456	return -ENOENT;
	457	}
30e0c6a6	458	rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
17625274 EL	459	mutex_unlock(&nf_log_mutex);
17625274 EL	460	} else {
266d07cb	461	mutex_lock(&nf_log_mutex);
0c26ed1c	462	logger = nft_log_dereference(net->nf.nf_loggers[tindex]);
17625274 EL	463	if (!logger)
	464	table->data = "NONE";
	465	else
	466	table->data = logger->name;
8d65af78	467	r = proc_dostring(table, write, buffer, lenp, ppos);
266d07cb	468	mutex_unlock(&nf_log_mutex);
17625274 EL	469	}
	470
	471	return r;
	472	}
	473
30e0c6a6	474	static int netfilter_log_sysctl_init(struct net *net)
f6ebe77f	475	{
ca735b3a	476	int i;
30e0c6a6 G	477	struct ctl_table *table;
	478
	479	table = nf_log_sysctl_table;
	480	if (!net_eq(net, &init_net)) {
	481	table = kmemdup(nf_log_sysctl_table,
	482	sizeof(nf_log_sysctl_table),
	483	GFP_KERNEL);
	484	if (!table)
	485	goto err_alloc;
	486	} else {
	487	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	488	snprintf(nf_log_sysctl_fnames[i],
	489	3, "%d", i);
	490	nf_log_sysctl_table[i].procname =
	491	nf_log_sysctl_fnames[i];
8aefc4d1	492	nf_log_sysctl_table[i].maxlen = NFLOGGER_NAME_LEN;
30e0c6a6 G	493	nf_log_sysctl_table[i].mode = 0644;
	494	nf_log_sysctl_table[i].proc_handler =
	495	nf_log_proc_dostring;
	496	nf_log_sysctl_table[i].extra1 =
	497	(void *)(unsigned long) i;
	498	}
2851940f MK	499	nf_log_sysctl_fhdr = register_net_sysctl(net, "net/netfilter",
	500	nf_log_sysctl_ftable);
	501	if (!nf_log_sysctl_fhdr)
	502	goto err_freg;
17625274 EL	503	}
17625274 EL	504
dbb5918c JH	505	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	506	table[i].extra2 = net;
	507
30e0c6a6 G	508	net->nf.nf_log_dir_header = register_net_sysctl(net,
	509	"net/netfilter/nf_log",
	510	table);
	511	if (!net->nf.nf_log_dir_header)
	512	goto err_reg;
17625274 EL	513
17625274 EL	514	return 0;
30e0c6a6 G	515
	516	err_reg:
	517	if (!net_eq(net, &init_net))
	518	kfree(table);
2851940f MK	519	else
	520	unregister_net_sysctl_table(nf_log_sysctl_fhdr);
	521	err_freg:
30e0c6a6 G	522	err_alloc:
	523	return -ENOMEM;
	524	}
	525
	526	static void netfilter_log_sysctl_exit(struct net *net)
	527	{
	528	struct ctl_table *table;
	529
	530	table = net->nf.nf_log_dir_header->ctl_table_arg;
	531	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
	532	if (!net_eq(net, &init_net))
	533	kfree(table);
2851940f MK	534	else
2851940f MK	535	unregister_net_sysctl_table(nf_log_sysctl_fhdr);
17625274 EL	536	}
17625274 EL	537	#else
30e0c6a6	538	static int netfilter_log_sysctl_init(struct net *net)
17625274 EL	539	{
	540	return 0;
	541	}
30e0c6a6 G	542
	543	static void netfilter_log_sysctl_exit(struct net *net)
	544	{
	545	}
17625274 EL	546	#endif /* CONFIG_SYSCTL */
17625274 EL	547
30e0c6a6	548	static int __net_init nf_log_net_init(struct net *net)
17625274	549	{
30e0c6a6 G	550	int ret = -ENOMEM;
30e0c6a6 G	551
f6ebe77f	552	#ifdef CONFIG_PROC_FS
8eeee8b1	553	if (!proc_create("nf_log", S_IRUGO,
30e0c6a6 G	554	net->nf.proc_netfilter, &nflog_file_ops))
30e0c6a6 G	555	return ret;
62243927	556	#endif
30e0c6a6 G	557	ret = netfilter_log_sysctl_init(net);
	558	if (ret < 0)
	559	goto out_sysctl;
ca735b3a	560
30e0c6a6 G	561	return 0;
	562
	563	out_sysctl:
e778f56e	564	#ifdef CONFIG_PROC_FS
6d11cfdb	565	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	566	#endif
30e0c6a6 G	567	return ret;
	568	}
	569
	570	static void __net_exit nf_log_net_exit(struct net *net)
	571	{
	572	netfilter_log_sysctl_exit(net);
e778f56e	573	#ifdef CONFIG_PROC_FS
30e0c6a6	574	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	575	#endif
30e0c6a6 G	576	}
	577
	578	static struct pernet_operations nf_log_net_ops = {
	579	.init = nf_log_net_init,
	580	.exit = nf_log_net_exit,
	581	};
	582
	583	int __init netfilter_log_init(void)
	584	{
5962815a	585	return register_pernet_subsys(&nf_log_net_ops);
f6ebe77f	586	}