[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);
	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 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);
	74	synchronize_rcu();
	75	}
	76	EXPORT_SYMBOL(nf_log_unset);
	77
d93cf068	78	/* return EEXIST if the same logger is registered, 0 on success. */
ca735b3a	79	int nf_log_register(u_int8_t pf, struct nf_logger *logger)
f6ebe77f	80	{
b6f0a365	81	int i;
8ac2bde2	82	int ret = 0;
ca735b3a	83
30e0c6a6	84	if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
ca735b3a EL	85	return -EINVAL;
ca735b3a EL	86
9b73534d	87	mutex_lock(&nf_log_mutex);
ca735b3a EL	88
ca735b3a EL	89	if (pf == NFPROTO_UNSPEC) {
8ac2bde2 ML	90	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	91	if (rcu_access_pointer(loggers[i][logger->type])) {
	92	ret = -EEXIST;
	93	goto unlock;
	94	}
	95	}
ca735b3a	96	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
5962815a	97	rcu_assign_pointer(loggers[i][logger->type], logger);
ca735b3a	98	} else {
8ac2bde2 ML	99	if (rcu_access_pointer(loggers[pf][logger->type])) {
	100	ret = -EEXIST;
	101	goto unlock;
	102	}
5962815a	103	rcu_assign_pointer(loggers[pf][logger->type], logger);
ca735b3a EL	104	}
ca735b3a EL	105
8ac2bde2	106	unlock:
9b73534d	107	mutex_unlock(&nf_log_mutex);
8ac2bde2	108	return ret;
f6ebe77f	109	}
ca735b3a	110	EXPORT_SYMBOL(nf_log_register);
f6ebe77f	111
ca735b3a	112	void nf_log_unregister(struct nf_logger *logger)
f6ebe77f	113	{
205ee117	114	const struct nf_logger *log;
f6ebe77f HW	115	int i;
f6ebe77f HW	116
9b73534d	117	mutex_lock(&nf_log_mutex);
205ee117 FW	118	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
	119	log = nft_log_dereference(loggers[i][logger->type]);
	120	if (log == logger)
	121	RCU_INIT_POINTER(loggers[i][logger->type], NULL);
	122	}
9b73534d	123	mutex_unlock(&nf_log_mutex);
ad5001cc	124	synchronize_rcu();
f6ebe77f	125	}
e92ad99c	126	EXPORT_SYMBOL(nf_log_unregister);
f6ebe77f	127
30e0c6a6 G	128	int nf_log_bind_pf(struct net *net, u_int8_t pf,
30e0c6a6 G	129	const struct nf_logger *logger)
ca735b3a	130	{
30e0c6a6	131	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	132	return -EINVAL;
ca735b3a EL	133	mutex_lock(&nf_log_mutex);
	134	if (__find_logger(pf, logger->name) == NULL) {
	135	mutex_unlock(&nf_log_mutex);
	136	return -ENOENT;
	137	}
30e0c6a6	138	rcu_assign_pointer(net->nf.nf_loggers[pf], logger);
ca735b3a EL	139	mutex_unlock(&nf_log_mutex);
	140	return 0;
	141	}
	142	EXPORT_SYMBOL(nf_log_bind_pf);
	143
30e0c6a6	144	void nf_log_unbind_pf(struct net *net, u_int8_t pf)
ca735b3a	145	{
30e0c6a6	146	if (pf >= ARRAY_SIZE(net->nf.nf_loggers))
9ef0298a	147	return;
ca735b3a	148	mutex_lock(&nf_log_mutex);
30e0c6a6	149	RCU_INIT_POINTER(net->nf.nf_loggers[pf], NULL);
ca735b3a EL	150	mutex_unlock(&nf_log_mutex);
	151	}
	152	EXPORT_SYMBOL(nf_log_unbind_pf);
	153
960649d1 PNA	154	void nf_logger_request_module(int pf, enum nf_log_type type)
	155	{
	156	if (loggers[pf][type] == NULL)
	157	request_module("nf-logger-%u-%u", pf, type);
	158	}
	159	EXPORT_SYMBOL_GPL(nf_logger_request_module);
	160
fab4085f PNA	161	int nf_logger_find_get(int pf, enum nf_log_type type)
	162	{
	163	struct nf_logger *logger;
	164	int ret = -ENOENT;
	165
f3bb5333 LZ	166	if (pf == NFPROTO_INET) {
	167	ret = nf_logger_find_get(NFPROTO_IPV4, type);
	168	if (ret < 0)
	169	return ret;
	170
	171	ret = nf_logger_find_get(NFPROTO_IPV6, type);
	172	if (ret < 0) {
	173	nf_logger_put(NFPROTO_IPV4, type);
	174	return ret;
	175	}
	176
	177	return 0;
	178	}
	179
c5a589cc	180	if (rcu_access_pointer(loggers[pf][type]) == NULL)
fab4085f PNA	181	request_module("nf-logger-%u-%u", pf, type);
	182
	183	rcu_read_lock();
	184	logger = rcu_dereference(loggers[pf][type]);
	185	if (logger == NULL)
	186	goto out;
	187
7e53e7f8	188	if (try_module_get(logger->me))
fab4085f PNA	189	ret = 0;
	190	out:
	191	rcu_read_unlock();
	192	return ret;
	193	}
	194	EXPORT_SYMBOL_GPL(nf_logger_find_get);
	195
	196	void nf_logger_put(int pf, enum nf_log_type type)
	197	{
	198	struct nf_logger *logger;
	199
f3bb5333 LZ	200	if (pf == NFPROTO_INET) {
	201	nf_logger_put(NFPROTO_IPV4, type);
	202	nf_logger_put(NFPROTO_IPV6, type);
	203	return;
	204	}
	205
fab4085f PNA	206	BUG_ON(loggers[pf][type] == NULL);
	207
	208	rcu_read_lock();
	209	logger = rcu_dereference(loggers[pf][type]);
	210	module_put(logger->me);
	211	rcu_read_unlock();
	212	}
	213	EXPORT_SYMBOL_GPL(nf_logger_put);
	214
30e0c6a6 G	215	void nf_log_packet(struct net *net,
30e0c6a6 G	216	u_int8_t pf,
f6ebe77f HW	217	unsigned int hooknum,
	218	const struct sk_buff *skb,
	219	const struct net_device *in,
	220	const struct net_device *out,
7b2f9631	221	const struct nf_loginfo *loginfo,
f6ebe77f HW	222	const char *fmt, ...)
	223	{
	224	va_list args;
	225	char prefix[NF_LOG_PREFIXLEN];
7b2f9631	226	const struct nf_logger *logger;
601e68e1	227
f6ebe77f	228	rcu_read_lock();
fab4085f PNA	229	if (loginfo != NULL)
	230	logger = rcu_dereference(loggers[pf][loginfo->type]);
	231	else
	232	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	233
f6ebe77f HW	234	if (logger) {
	235	va_start(args, fmt);
	236	vsnprintf(prefix, sizeof(prefix), fmt, args);
	237	va_end(args);
8cdb46da	238	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
f6ebe77f HW	239	}
	240	rcu_read_unlock();
	241	}
	242	EXPORT_SYMBOL(nf_log_packet);
	243
4017a7ee PNA	244	void nf_log_trace(struct net *net,
	245	u_int8_t pf,
	246	unsigned int hooknum,
	247	const struct sk_buff *skb,
	248	const struct net_device *in,
	249	const struct net_device *out,
	250	const struct nf_loginfo loginfo, const char fmt, ...)
	251	{
	252	va_list args;
	253	char prefix[NF_LOG_PREFIXLEN];
	254	const struct nf_logger *logger;
	255
	256	rcu_read_lock();
	257	logger = rcu_dereference(net->nf.nf_loggers[pf]);
	258	if (logger) {
	259	va_start(args, fmt);
	260	vsnprintf(prefix, sizeof(prefix), fmt, args);
	261	va_end(args);
	262	logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
	263	}
	264	rcu_read_unlock();
	265	}
	266	EXPORT_SYMBOL(nf_log_trace);
	267
27fd8d90 PNA	268	#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
	269
	270	struct nf_log_buf {
	271	unsigned int count;
	272	char buf[S_SIZE + 1];
	273	};
	274	static struct nf_log_buf emergency, *emergency_ptr = &emergency;
	275
	276	__printf(2, 3) int nf_log_buf_add(struct nf_log_buf m, const char f, ...)
	277	{
	278	va_list args;
	279	int len;
	280
	281	if (likely(m->count < S_SIZE)) {
	282	va_start(args, f);
	283	len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
	284	va_end(args);
	285	if (likely(m->count + len < S_SIZE)) {
	286	m->count += len;
	287	return 0;
	288	}
	289	}
	290	m->count = S_SIZE;
	291	printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
	292	return -1;
	293	}
	294	EXPORT_SYMBOL_GPL(nf_log_buf_add);
	295
	296	struct nf_log_buf *nf_log_buf_open(void)
	297	{
	298	struct nf_log_buf m = kmalloc(sizeof(m), GFP_ATOMIC);
	299
	300	if (unlikely(!m)) {
	301	local_bh_disable();
	302	do {
	303	m = xchg(&emergency_ptr, NULL);
	304	} while (!m);
	305	}
	306	m->count = 0;
	307	return m;
	308	}
	309	EXPORT_SYMBOL_GPL(nf_log_buf_open);
	310
	311	void nf_log_buf_close(struct nf_log_buf *m)
	312	{
	313	m->buf[m->count] = 0;
	314	printk("%s\n", m->buf);
	315
	316	if (likely(m != &emergency))
	317	kfree(m);
	318	else {
	319	emergency_ptr = m;
	320	local_bh_enable();
	321	}
	322	}
	323	EXPORT_SYMBOL_GPL(nf_log_buf_close);
	324
f6ebe77f HW	325	#ifdef CONFIG_PROC_FS
	326	static void seq_start(struct seq_file seq, loff_t *pos)
	327	{
30e0c6a6 G	328	struct net *net = seq_file_net(seq);
30e0c6a6 G	329
6440fe05	330	mutex_lock(&nf_log_mutex);
f6ebe77f	331
30e0c6a6	332	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	333	return NULL;
	334
	335	return pos;
	336	}
	337
	338	static void seq_next(struct seq_file s, void v, loff_t pos)
	339	{
30e0c6a6 G	340	struct net *net = seq_file_net(s);
30e0c6a6 G	341
f6ebe77f HW	342	(*pos)++;
f6ebe77f HW	343
30e0c6a6	344	if (*pos >= ARRAY_SIZE(net->nf.nf_loggers))
f6ebe77f HW	345	return NULL;
	346
	347	return pos;
	348	}
	349
	350	static void seq_stop(struct seq_file s, void v)
	351	{
6440fe05	352	mutex_unlock(&nf_log_mutex);
f6ebe77f HW	353	}
	354
	355	static int seq_show(struct seq_file s, void v)
	356	{
	357	loff_t *pos = v;
	358	const struct nf_logger *logger;
e71456ae	359	int i;
30e0c6a6	360	struct net *net = seq_file_net(s);
f6ebe77f	361
0c26ed1c	362	logger = nft_log_dereference(net->nf.nf_loggers[*pos]);
f6ebe77f HW	363
f6ebe77f HW	364	if (!logger)
e71456ae	365	seq_printf(s, "%2lld NONE (", *pos);
c7a913cd	366	else
e71456ae	367	seq_printf(s, "%2lld %s (", *pos, logger->name);
c7a913cd	368
e71456ae SRRH	369	if (seq_has_overflowed(s))
e71456ae SRRH	370	return -ENOSPC;
c7a913cd	371
5962815a PNA	372	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
	373	if (loggers[*pos][i] == NULL)
	374	continue;
	375
0c26ed1c	376	logger = nft_log_dereference(loggers[*pos][i]);
e71456ae SRRH	377	seq_printf(s, "%s", logger->name);
	378	if (i == 0 && loggers[*pos][i + 1] != NULL)
	379	seq_printf(s, ",");
	380
	381	if (seq_has_overflowed(s))
	382	return -ENOSPC;
c7a913cd	383	}
601e68e1	384
e71456ae SRRH	385	seq_printf(s, ")\n");
	386
	387	if (seq_has_overflowed(s))
	388	return -ENOSPC;
	389	return 0;
f6ebe77f HW	390	}
f6ebe77f HW	391
56b3d975	392	static const struct seq_operations nflog_seq_ops = {
f6ebe77f HW	393	.start = seq_start,
	394	.next = seq_next,
	395	.stop = seq_stop,
	396	.show = seq_show,
	397	};
	398
	399	static int nflog_open(struct inode inode, struct file file)
	400	{
30e0c6a6 G	401	return seq_open_net(inode, file, &nflog_seq_ops,
30e0c6a6 G	402	sizeof(struct seq_net_private));
f6ebe77f HW	403	}
f6ebe77f HW	404
da7071d7	405	static const struct file_operations nflog_file_ops = {
f6ebe77f HW	406	.owner = THIS_MODULE,
	407	.open = nflog_open,
	408	.read = seq_read,
	409	.llseek = seq_lseek,
30e0c6a6	410	.release = seq_release_net,
f6ebe77f HW	411	};
f6ebe77f HW	412
17625274	413
f6ebe77f HW	414	#endif /* PROC_FS */
f6ebe77f HW	415
17625274	416	#ifdef CONFIG_SYSCTL
17625274 EL	417	static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
17625274 EL	418	static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
2851940f MK	419	static struct ctl_table_header *nf_log_sysctl_fhdr;
	420
	421	static struct ctl_table nf_log_sysctl_ftable[] = {
	422	{
	423	.procname = "nf_log_all_netns",
	424	.data = &sysctl_nf_log_all_netns,
	425	.maxlen = sizeof(sysctl_nf_log_all_netns),
	426	.mode = 0644,
	427	.proc_handler = proc_dointvec,
	428	},
	429	{ }
	430	};
f6ebe77f	431
fe2c6338	432	static int nf_log_proc_dostring(struct ctl_table *table, int write,
24955619	433	void __user buffer, size_t lenp, loff_t *ppos)
17625274 EL	434	{
17625274 EL	435	const struct nf_logger *logger;
24955619	436	char buf[NFLOGGER_NAME_LEN];
17625274 EL	437	int r = 0;
17625274 EL	438	int tindex = (unsigned long)table->extra1;
dbb5918c	439	struct net *net = table->extra2;
17625274 EL	440
17625274 EL	441	if (write) {
c6ac37d8 PT	442	struct ctl_table tmp = *table;
	443
	444	tmp.data = buf;
	445	r = proc_dostring(&tmp, write, buffer, lenp, ppos);
	446	if (r)
	447	return r;
24955619 PM	448
24955619 PM	449	if (!strcmp(buf, "NONE")) {
30e0c6a6	450	nf_log_unbind_pf(net, tindex);
17625274 EL	451	return 0;
	452	}
	453	mutex_lock(&nf_log_mutex);
24955619	454	logger = __find_logger(tindex, buf);
17625274 EL	455	if (logger == NULL) {
	456	mutex_unlock(&nf_log_mutex);
	457	return -ENOENT;
	458	}
30e0c6a6	459	rcu_assign_pointer(net->nf.nf_loggers[tindex], logger);
17625274 EL	460	mutex_unlock(&nf_log_mutex);
17625274 EL	461	} else {
266d07cb	462	mutex_lock(&nf_log_mutex);
0c26ed1c	463	logger = nft_log_dereference(net->nf.nf_loggers[tindex]);
17625274 EL	464	if (!logger)
	465	table->data = "NONE";
	466	else
	467	table->data = logger->name;
8d65af78	468	r = proc_dostring(table, write, buffer, lenp, ppos);
266d07cb	469	mutex_unlock(&nf_log_mutex);
17625274 EL	470	}
	471
	472	return r;
	473	}
	474
30e0c6a6	475	static int netfilter_log_sysctl_init(struct net *net)
f6ebe77f	476	{
ca735b3a	477	int i;
30e0c6a6 G	478	struct ctl_table *table;
	479
	480	table = nf_log_sysctl_table;
	481	if (!net_eq(net, &init_net)) {
	482	table = kmemdup(nf_log_sysctl_table,
	483	sizeof(nf_log_sysctl_table),
	484	GFP_KERNEL);
	485	if (!table)
	486	goto err_alloc;
	487	} else {
	488	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
	489	snprintf(nf_log_sysctl_fnames[i],
	490	3, "%d", i);
	491	nf_log_sysctl_table[i].procname =
	492	nf_log_sysctl_fnames[i];
8aefc4d1	493	nf_log_sysctl_table[i].maxlen = NFLOGGER_NAME_LEN;
30e0c6a6 G	494	nf_log_sysctl_table[i].mode = 0644;
	495	nf_log_sysctl_table[i].proc_handler =
	496	nf_log_proc_dostring;
	497	nf_log_sysctl_table[i].extra1 =
	498	(void *)(unsigned long) i;
	499	}
2851940f MK	500	nf_log_sysctl_fhdr = register_net_sysctl(net, "net/netfilter",
	501	nf_log_sysctl_ftable);
	502	if (!nf_log_sysctl_fhdr)
	503	goto err_freg;
17625274 EL	504	}
17625274 EL	505
dbb5918c JH	506	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
	507	table[i].extra2 = net;
	508
30e0c6a6 G	509	net->nf.nf_log_dir_header = register_net_sysctl(net,
	510	"net/netfilter/nf_log",
	511	table);
	512	if (!net->nf.nf_log_dir_header)
	513	goto err_reg;
17625274 EL	514
17625274 EL	515	return 0;
30e0c6a6 G	516
	517	err_reg:
	518	if (!net_eq(net, &init_net))
	519	kfree(table);
2851940f MK	520	else
	521	unregister_net_sysctl_table(nf_log_sysctl_fhdr);
	522	err_freg:
30e0c6a6 G	523	err_alloc:
	524	return -ENOMEM;
	525	}
	526
	527	static void netfilter_log_sysctl_exit(struct net *net)
	528	{
	529	struct ctl_table *table;
	530
	531	table = net->nf.nf_log_dir_header->ctl_table_arg;
	532	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
	533	if (!net_eq(net, &init_net))
	534	kfree(table);
2851940f MK	535	else
2851940f MK	536	unregister_net_sysctl_table(nf_log_sysctl_fhdr);
17625274 EL	537	}
17625274 EL	538	#else
30e0c6a6	539	static int netfilter_log_sysctl_init(struct net *net)
17625274 EL	540	{
	541	return 0;
	542	}
30e0c6a6 G	543
	544	static void netfilter_log_sysctl_exit(struct net *net)
	545	{
	546	}
17625274 EL	547	#endif /* CONFIG_SYSCTL */
17625274 EL	548
30e0c6a6	549	static int __net_init nf_log_net_init(struct net *net)
17625274	550	{
30e0c6a6 G	551	int ret = -ENOMEM;
30e0c6a6 G	552
f6ebe77f	553	#ifdef CONFIG_PROC_FS
8eeee8b1	554	if (!proc_create("nf_log", S_IRUGO,
30e0c6a6 G	555	net->nf.proc_netfilter, &nflog_file_ops))
30e0c6a6 G	556	return ret;
62243927	557	#endif
30e0c6a6 G	558	ret = netfilter_log_sysctl_init(net);
	559	if (ret < 0)
	560	goto out_sysctl;
ca735b3a	561
30e0c6a6 G	562	return 0;
	563
	564	out_sysctl:
e778f56e	565	#ifdef CONFIG_PROC_FS
6d11cfdb	566	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	567	#endif
30e0c6a6 G	568	return ret;
	569	}
	570
	571	static void __net_exit nf_log_net_exit(struct net *net)
	572	{
	573	netfilter_log_sysctl_exit(net);
e778f56e	574	#ifdef CONFIG_PROC_FS
30e0c6a6	575	remove_proc_entry("nf_log", net->nf.proc_netfilter);
e778f56e	576	#endif
30e0c6a6 G	577	}
	578
	579	static struct pernet_operations nf_log_net_ops = {
	580	.init = nf_log_net_init,
	581	.exit = nf_log_net_exit,
	582	};
	583
	584	int __init netfilter_log_init(void)
	585	{
5962815a	586	return register_pernet_subsys(&nf_log_net_ops);
f6ebe77f	587	}