[deliverable/linux.git] / net / netfilter / nf_conntrack_standalone.c

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/percpu.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_zones.h>

MODULE_LICENSE("GPL");

#ifdef CONFIG_PROC_FS
int
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
            const struct nf_conntrack_l3proto *l3proto,
            const struct nf_conntrack_l4proto *l4proto)
{
	return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
}
EXPORT_SYMBOL_GPL(print_tuple);

struct ct_iter_state {
	struct seq_net_private p;
	unsigned int bucket;
};

static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
{
	struct net *net = seq_file_net(seq);
	struct ct_iter_state *st = seq->private;
	struct hlist_nulls_node *n;

	for (st->bucket = 0;
	     st->bucket < net->ct.htable_size;
	     st->bucket++) {
		n = rcu_dereference(net->ct.hash[st->bucket].first);
		if (!is_a_nulls(n))
			return n;
	}
	return NULL;
}

static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
				      struct hlist_nulls_node *head)
{
	struct net *net = seq_file_net(seq);
	struct ct_iter_state *st = seq->private;

	head = rcu_dereference(head->next);
	while (is_a_nulls(head)) {
		if (likely(get_nulls_value(head) == st->bucket)) {
			if (++st->bucket >= net->ct.htable_size)
				return NULL;
		}
		head = rcu_dereference(net->ct.hash[st->bucket].first);
	}
	return head;
}

static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
{
	struct hlist_nulls_node *head = ct_get_first(seq);

	if (head)
		while (pos && (head = ct_get_next(seq, head)))
			pos--;
	return pos ? NULL : head;
}

static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(RCU)
{
	rcu_read_lock();
	return ct_get_idx(seq, *pos);
}

static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	(*pos)++;
	return ct_get_next(s, v);
}

static void ct_seq_stop(struct seq_file *s, void *v)
	__releases(RCU)
{
	rcu_read_unlock();
}

/* return 0 on success, 1 in case of error */
static int ct_seq_show(struct seq_file *s, void *v)
{
	struct nf_conntrack_tuple_hash *hash = v;
	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
	const struct nf_conntrack_l3proto *l3proto;
	const struct nf_conntrack_l4proto *l4proto;
	int ret = 0;

	NF_CT_ASSERT(ct);
	if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
		return 0;

	/* we only want to print DIR_ORIGINAL */
	if (NF_CT_DIRECTION(hash))
		goto release;

	l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
	NF_CT_ASSERT(l3proto);
	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
	NF_CT_ASSERT(l4proto);

	ret = -ENOSPC;
	if (seq_printf(s, "%-8s %u %-8s %u %ld ",
		       l3proto->name, nf_ct_l3num(ct),
		       l4proto->name, nf_ct_protonum(ct),
		       timer_pending(&ct->timeout)
		       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
		goto release;

	if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
		goto release;

	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
			l3proto, l4proto))
		goto release;

	if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
		goto release;

	if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
		if (seq_printf(s, "[UNREPLIED] "))
			goto release;

	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
			l3proto, l4proto))
		goto release;

	if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
		goto release;

	if (test_bit(IPS_ASSURED_BIT, &ct->status))
		if (seq_printf(s, "[ASSURED] "))
			goto release;

#if defined(CONFIG_NF_CONNTRACK_MARK)
	if (seq_printf(s, "mark=%u ", ct->mark))
		goto release;
#endif

#ifdef CONFIG_NF_CONNTRACK_SECMARK
	if (seq_printf(s, "secmark=%u ", ct->secmark))
		goto release;
#endif

#ifdef CONFIG_NF_CONNTRACK_ZONES
	if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
		goto release;
#endif

	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
		goto release;

	ret = 0;
release:
	nf_ct_put(ct);
	return 0;
}

static const struct seq_operations ct_seq_ops = {
	.start = ct_seq_start,
	.next  = ct_seq_next,
	.stop  = ct_seq_stop,
	.show  = ct_seq_show
};

static int ct_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &ct_seq_ops,
			sizeof(struct ct_iter_state));
}

static const struct file_operations ct_file_ops = {
	.owner   = THIS_MODULE,
	.open    = ct_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net,
};

static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
{
	struct net *net = seq_file_net(seq);
	int cpu;

	if (*pos == 0)
		return SEQ_START_TOKEN;

	for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
		if (!cpu_possible(cpu))
			continue;
		*pos = cpu + 1;
		return per_cpu_ptr(net->ct.stat, cpu);
	}

	return NULL;
}

static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct net *net = seq_file_net(seq);
	int cpu;

	for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
		if (!cpu_possible(cpu))
			continue;
		*pos = cpu + 1;
		return per_cpu_ptr(net->ct.stat, cpu);
	}

	return NULL;
}

static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
{
}

static int ct_cpu_seq_show(struct seq_file *seq, void *v)
{
	struct net *net = seq_file_net(seq);
	unsigned int nr_conntracks = atomic_read(&net->ct.count);
	const struct ip_conntrack_stat *st = v;

	if (v == SEQ_START_TOKEN) {
		seq_printf(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete search_restart\n");
		return 0;
	}

	seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
			"%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
		   nr_conntracks,
		   st->searched,
		   st->found,
		   st->new,
		   st->invalid,
		   st->ignore,
		   st->delete,
		   st->delete_list,
		   st->insert,
		   st->insert_failed,
		   st->drop,
		   st->early_drop,
		   st->error,

		   st->expect_new,
		   st->expect_create,
		   st->expect_delete,
		   st->search_restart
		);
	return 0;
}

static const struct seq_operations ct_cpu_seq_ops = {
	.start	= ct_cpu_seq_start,
	.next	= ct_cpu_seq_next,
	.stop	= ct_cpu_seq_stop,
	.show	= ct_cpu_seq_show,
};

static int ct_cpu_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &ct_cpu_seq_ops,
			    sizeof(struct seq_net_private));
}

static const struct file_operations ct_cpu_seq_fops = {
	.owner	 = THIS_MODULE,
	.open	 = ct_cpu_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
	.release = seq_release_net,
};

static int nf_conntrack_standalone_init_proc(struct net *net)
{
	struct proc_dir_entry *pde;

	pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
	if (!pde)
		goto out_nf_conntrack;

	pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
			  &ct_cpu_seq_fops);
	if (!pde)
		goto out_stat_nf_conntrack;
	return 0;

out_stat_nf_conntrack:
	proc_net_remove(net, "nf_conntrack");
out_nf_conntrack:
	return -ENOMEM;
}

static void nf_conntrack_standalone_fini_proc(struct net *net)
{
	remove_proc_entry("nf_conntrack", net->proc_net_stat);
	proc_net_remove(net, "nf_conntrack");
}
#else
static int nf_conntrack_standalone_init_proc(struct net *net)
{
	return 0;
}

static void nf_conntrack_standalone_fini_proc(struct net *net)
{
}
#endif /* CONFIG_PROC_FS */

/* Sysctl support */

#ifdef CONFIG_SYSCTL
/* Log invalid packets of a given protocol */
static int log_invalid_proto_min = 0;
static int log_invalid_proto_max = 255;

static struct ctl_table_header *nf_ct_netfilter_header;

static ctl_table nf_ct_sysctl_table[] = {
	{
		.procname	= "nf_conntrack_max",
		.data		= &nf_conntrack_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "nf_conntrack_count",
		.data		= &init_net.ct.count,
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname       = "nf_conntrack_buckets",
		.data           = &init_net.ct.htable_size,
		.maxlen         = sizeof(unsigned int),
		.mode           = 0444,
		.proc_handler   = proc_dointvec,
	},
	{
		.procname	= "nf_conntrack_checksum",
		.data		= &init_net.ct.sysctl_checksum,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "nf_conntrack_log_invalid",
		.data		= &init_net.ct.sysctl_log_invalid,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &log_invalid_proto_min,
		.extra2		= &log_invalid_proto_max,
	},
	{
		.procname	= "nf_conntrack_expect_max",
		.data		= &nf_ct_expect_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

#define NET_NF_CONNTRACK_MAX 2089

static ctl_table nf_ct_netfilter_table[] = {
	{
		.procname	= "nf_conntrack_max",
		.data		= &nf_conntrack_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

static struct ctl_path nf_ct_path[] = {
	{ .procname = "net", },
	{ }
};

static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
	struct ctl_table *table;

	if (net_eq(net, &init_net)) {
		nf_ct_netfilter_header =
		       register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
		if (!nf_ct_netfilter_header)
			goto out;
	}

	table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
			GFP_KERNEL);
	if (!table)
		goto out_kmemdup;

	table[1].data = &net->ct.count;
	table[2].data = &net->ct.htable_size;
	table[3].data = &net->ct.sysctl_checksum;
	table[4].data = &net->ct.sysctl_log_invalid;

	net->ct.sysctl_header = register_net_sysctl_table(net,
					nf_net_netfilter_sysctl_path, table);
	if (!net->ct.sysctl_header)
		goto out_unregister_netfilter;

	return 0;

out_unregister_netfilter:
	kfree(table);
out_kmemdup:
	if (net_eq(net, &init_net))
		unregister_sysctl_table(nf_ct_netfilter_header);
out:
	printk(KERN_ERR "nf_conntrack: can't register to sysctl.\n");
	return -ENOMEM;
}

static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
	struct ctl_table *table;

	if (net_eq(net, &init_net))
		unregister_sysctl_table(nf_ct_netfilter_header);
	table = net->ct.sysctl_header->ctl_table_arg;
	unregister_net_sysctl_table(net->ct.sysctl_header);
	kfree(table);
}
#else
static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
	return 0;
}

static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
}
#endif /* CONFIG_SYSCTL */

static int nf_conntrack_net_init(struct net *net)
{
	int ret;

	ret = nf_conntrack_init(net);
	if (ret < 0)
		goto out_init;
	ret = nf_conntrack_standalone_init_proc(net);
	if (ret < 0)
		goto out_proc;
	net->ct.sysctl_checksum = 1;
	net->ct.sysctl_log_invalid = 0;
	ret = nf_conntrack_standalone_init_sysctl(net);
	if (ret < 0)
		goto out_sysctl;
	return 0;

out_sysctl:
	nf_conntrack_standalone_fini_proc(net);
out_proc:
	nf_conntrack_cleanup(net);
out_init:
	return ret;
}

static void nf_conntrack_net_exit(struct net *net)
{
	nf_conntrack_standalone_fini_sysctl(net);
	nf_conntrack_standalone_fini_proc(net);
	nf_conntrack_cleanup(net);
}

static struct pernet_operations nf_conntrack_net_ops = {
	.init = nf_conntrack_net_init,
	.exit = nf_conntrack_net_exit,
};

static int __init nf_conntrack_standalone_init(void)
{
	return register_pernet_subsys(&nf_conntrack_net_ops);
}

static void __exit nf_conntrack_standalone_fini(void)
{
	unregister_pernet_subsys(&nf_conntrack_net_ops);
}

module_init(nf_conntrack_standalone_init);
module_exit(nf_conntrack_standalone_fini);

/* Some modules need us, but don't depend directly on any symbol.
   They should call this. */
void need_conntrack(void)
{
}
EXPORT_SYMBOL_GPL(need_conntrack);
Commit	Line	Data
	1	/* (C) 1999-2001 Paul `Rusty' Russell
	2	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/netfilter.h>
	11	#include <linux/slab.h>
	12	#include <linux/module.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/proc_fs.h>
	15	#include <linux/seq_file.h>
	16	#include <linux/percpu.h>
	17	#include <linux/netdevice.h>
	18	#include <net/net_namespace.h>
	19	#ifdef CONFIG_SYSCTL
	20	#include <linux/sysctl.h>
	21	#endif
	22
	23	#include <net/netfilter/nf_conntrack.h>
	24	#include <net/netfilter/nf_conntrack_core.h>
	25	#include <net/netfilter/nf_conntrack_l3proto.h>
	26	#include <net/netfilter/nf_conntrack_l4proto.h>
	27	#include <net/netfilter/nf_conntrack_expect.h>
	28	#include <net/netfilter/nf_conntrack_helper.h>
	29	#include <net/netfilter/nf_conntrack_acct.h>
	30	#include <net/netfilter/nf_conntrack_zones.h>
	31
	32	MODULE_LICENSE("GPL");
	33
	34	#ifdef CONFIG_PROC_FS
	35	int
	36	print_tuple(struct seq_file s, const struct nf_conntrack_tuple tuple,
	37	const struct nf_conntrack_l3proto *l3proto,
	38	const struct nf_conntrack_l4proto *l4proto)
	39	{
	40	return l3proto->print_tuple(s, tuple) \|\| l4proto->print_tuple(s, tuple);
	41	}
	42	EXPORT_SYMBOL_GPL(print_tuple);
	43
	44	struct ct_iter_state {
	45	struct seq_net_private p;
	46	unsigned int bucket;
	47	};
	48
	49	static struct hlist_nulls_node ct_get_first(struct seq_file seq)
	50	{
	51	struct net *net = seq_file_net(seq);
	52	struct ct_iter_state *st = seq->private;
	53	struct hlist_nulls_node *n;
	54
	55	for (st->bucket = 0;
	56	st->bucket < net->ct.htable_size;
	57	st->bucket++) {
	58	n = rcu_dereference(net->ct.hash[st->bucket].first);
	59	if (!is_a_nulls(n))
	60	return n;
	61	}
	62	return NULL;
	63	}
	64
	65	static struct hlist_nulls_node ct_get_next(struct seq_file seq,
	66	struct hlist_nulls_node *head)
	67	{
	68	struct net *net = seq_file_net(seq);
	69	struct ct_iter_state *st = seq->private;
	70
	71	head = rcu_dereference(head->next);
	72	while (is_a_nulls(head)) {
	73	if (likely(get_nulls_value(head) == st->bucket)) {
	74	if (++st->bucket >= net->ct.htable_size)
	75	return NULL;
	76	}
	77	head = rcu_dereference(net->ct.hash[st->bucket].first);
	78	}
	79	return head;
	80	}
	81
	82	static struct hlist_nulls_node ct_get_idx(struct seq_file seq, loff_t pos)
	83	{
	84	struct hlist_nulls_node *head = ct_get_first(seq);
	85
	86	if (head)
	87	while (pos && (head = ct_get_next(seq, head)))
	88	pos--;
	89	return pos ? NULL : head;
	90	}
	91
	92	static void ct_seq_start(struct seq_file seq, loff_t *pos)
	93	__acquires(RCU)
	94	{
	95	rcu_read_lock();
	96	return ct_get_idx(seq, *pos);
	97	}
	98
	99	static void ct_seq_next(struct seq_file s, void v, loff_t pos)
	100	{
	101	(*pos)++;
	102	return ct_get_next(s, v);
	103	}
	104
	105	static void ct_seq_stop(struct seq_file s, void v)
	106	__releases(RCU)
	107	{
	108	rcu_read_unlock();
	109	}
	110
	111	/* return 0 on success, 1 in case of error */
	112	static int ct_seq_show(struct seq_file s, void v)
	113	{
	114	struct nf_conntrack_tuple_hash *hash = v;
	115	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
	116	const struct nf_conntrack_l3proto *l3proto;
	117	const struct nf_conntrack_l4proto *l4proto;
	118	int ret = 0;
	119
	120	NF_CT_ASSERT(ct);
	121	if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
	122	return 0;
	123
	124	/* we only want to print DIR_ORIGINAL */
	125	if (NF_CT_DIRECTION(hash))
	126	goto release;
	127
	128	l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
	129	NF_CT_ASSERT(l3proto);
	130	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
	131	NF_CT_ASSERT(l4proto);
	132
	133	ret = -ENOSPC;
	134	if (seq_printf(s, "%-8s %u %-8s %u %ld ",
	135	l3proto->name, nf_ct_l3num(ct),
	136	l4proto->name, nf_ct_protonum(ct),
	137	timer_pending(&ct->timeout)
	138	? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
	139	goto release;
	140
	141	if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
	142	goto release;
	143
	144	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
	145	l3proto, l4proto))
	146	goto release;
	147
	148	if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
	149	goto release;
	150
	151	if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
	152	if (seq_printf(s, "[UNREPLIED] "))
	153	goto release;
	154
	155	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
	156	l3proto, l4proto))
	157	goto release;
	158
	159	if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
	160	goto release;
	161
	162	if (test_bit(IPS_ASSURED_BIT, &ct->status))
	163	if (seq_printf(s, "[ASSURED] "))
	164	goto release;
	165
	166	#if defined(CONFIG_NF_CONNTRACK_MARK)
	167	if (seq_printf(s, "mark=%u ", ct->mark))
	168	goto release;
	169	#endif
	170
	171	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	172	if (seq_printf(s, "secmark=%u ", ct->secmark))
	173	goto release;
	174	#endif
	175
	176	#ifdef CONFIG_NF_CONNTRACK_ZONES
	177	if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
	178	goto release;
	179	#endif
	180
	181	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
	182	goto release;
	183
	184	ret = 0;
	185	release:
	186	nf_ct_put(ct);
	187	return 0;
	188	}
	189
	190	static const struct seq_operations ct_seq_ops = {
	191	.start = ct_seq_start,
	192	.next = ct_seq_next,
	193	.stop = ct_seq_stop,
	194	.show = ct_seq_show
	195	};
	196
	197	static int ct_open(struct inode inode, struct file file)
	198	{
	199	return seq_open_net(inode, file, &ct_seq_ops,
	200	sizeof(struct ct_iter_state));
	201	}
	202
	203	static const struct file_operations ct_file_ops = {
	204	.owner = THIS_MODULE,
	205	.open = ct_open,
	206	.read = seq_read,
	207	.llseek = seq_lseek,
	208	.release = seq_release_net,
	209	};
	210
	211	static void ct_cpu_seq_start(struct seq_file seq, loff_t *pos)
	212	{
	213	struct net *net = seq_file_net(seq);
	214	int cpu;
	215
	216	if (*pos == 0)
	217	return SEQ_START_TOKEN;
	218
	219	for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
	220	if (!cpu_possible(cpu))
	221	continue;
	222	*pos = cpu + 1;
	223	return per_cpu_ptr(net->ct.stat, cpu);
	224	}
	225
	226	return NULL;
	227	}
	228
	229	static void ct_cpu_seq_next(struct seq_file seq, void v, loff_t pos)
	230	{
	231	struct net *net = seq_file_net(seq);
	232	int cpu;
	233
	234	for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
	235	if (!cpu_possible(cpu))
	236	continue;
	237	*pos = cpu + 1;
	238	return per_cpu_ptr(net->ct.stat, cpu);
	239	}
	240
	241	return NULL;
	242	}
	243
	244	static void ct_cpu_seq_stop(struct seq_file seq, void v)
	245	{
	246	}
	247
	248	static int ct_cpu_seq_show(struct seq_file seq, void v)
	249	{
	250	struct net *net = seq_file_net(seq);
	251	unsigned int nr_conntracks = atomic_read(&net->ct.count);
	252	const struct ip_conntrack_stat *st = v;
	253
	254	if (v == SEQ_START_TOKEN) {
	255	seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete search_restart\n");
	256	return 0;
	257	}
	258
	259	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
	260	"%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
	261	nr_conntracks,
	262	st->searched,
	263	st->found,
	264	st->new,
	265	st->invalid,
	266	st->ignore,
	267	st->delete,
	268	st->delete_list,
	269	st->insert,
	270	st->insert_failed,
	271	st->drop,
	272	st->early_drop,
	273	st->error,
	274
	275	st->expect_new,
	276	st->expect_create,
	277	st->expect_delete,
	278	st->search_restart
	279	);
	280	return 0;
	281	}
	282
	283	static const struct seq_operations ct_cpu_seq_ops = {
	284	.start = ct_cpu_seq_start,
	285	.next = ct_cpu_seq_next,
	286	.stop = ct_cpu_seq_stop,
	287	.show = ct_cpu_seq_show,
	288	};
	289
	290	static int ct_cpu_seq_open(struct inode inode, struct file file)
	291	{
	292	return seq_open_net(inode, file, &ct_cpu_seq_ops,
	293	sizeof(struct seq_net_private));
	294	}
	295
	296	static const struct file_operations ct_cpu_seq_fops = {
	297	.owner = THIS_MODULE,
	298	.open = ct_cpu_seq_open,
	299	.read = seq_read,
	300	.llseek = seq_lseek,
	301	.release = seq_release_net,
	302	};
	303
	304	static int nf_conntrack_standalone_init_proc(struct net *net)
	305	{
	306	struct proc_dir_entry *pde;
	307
	308	pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
	309	if (!pde)
	310	goto out_nf_conntrack;
	311
	312	pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
	313	&ct_cpu_seq_fops);
	314	if (!pde)
	315	goto out_stat_nf_conntrack;
	316	return 0;
	317
	318	out_stat_nf_conntrack:
	319	proc_net_remove(net, "nf_conntrack");
	320	out_nf_conntrack:
	321	return -ENOMEM;
	322	}
	323
	324	static void nf_conntrack_standalone_fini_proc(struct net *net)
	325	{
	326	remove_proc_entry("nf_conntrack", net->proc_net_stat);
	327	proc_net_remove(net, "nf_conntrack");
	328	}
	329	#else
	330	static int nf_conntrack_standalone_init_proc(struct net *net)
	331	{
	332	return 0;
	333	}
	334
	335	static void nf_conntrack_standalone_fini_proc(struct net *net)
	336	{
	337	}
	338	#endif /* CONFIG_PROC_FS */
	339
	340	/* Sysctl support */
	341
	342	#ifdef CONFIG_SYSCTL
	343	/* Log invalid packets of a given protocol */
	344	static int log_invalid_proto_min = 0;
	345	static int log_invalid_proto_max = 255;
	346
	347	static struct ctl_table_header *nf_ct_netfilter_header;
	348
	349	static ctl_table nf_ct_sysctl_table[] = {
	350	{
	351	.procname = "nf_conntrack_max",
	352	.data = &nf_conntrack_max,
	353	.maxlen = sizeof(int),
	354	.mode = 0644,
	355	.proc_handler = proc_dointvec,
	356	},
	357	{
	358	.procname = "nf_conntrack_count",
	359	.data = &init_net.ct.count,
	360	.maxlen = sizeof(int),
	361	.mode = 0444,
	362	.proc_handler = proc_dointvec,
	363	},
	364	{
	365	.procname = "nf_conntrack_buckets",
	366	.data = &init_net.ct.htable_size,
	367	.maxlen = sizeof(unsigned int),
	368	.mode = 0444,
	369	.proc_handler = proc_dointvec,
	370	},
	371	{
	372	.procname = "nf_conntrack_checksum",
	373	.data = &init_net.ct.sysctl_checksum,
	374	.maxlen = sizeof(unsigned int),
	375	.mode = 0644,
	376	.proc_handler = proc_dointvec,
	377	},
	378	{
	379	.procname = "nf_conntrack_log_invalid",
	380	.data = &init_net.ct.sysctl_log_invalid,
	381	.maxlen = sizeof(unsigned int),
	382	.mode = 0644,
	383	.proc_handler = proc_dointvec_minmax,
	384	.extra1 = &log_invalid_proto_min,
	385	.extra2 = &log_invalid_proto_max,
	386	},
	387	{
	388	.procname = "nf_conntrack_expect_max",
	389	.data = &nf_ct_expect_max,
	390	.maxlen = sizeof(int),
	391	.mode = 0644,
	392	.proc_handler = proc_dointvec,
	393	},
	394	{ }
	395	};
	396
	397	#define NET_NF_CONNTRACK_MAX 2089
	398
	399	static ctl_table nf_ct_netfilter_table[] = {
	400	{
	401	.procname = "nf_conntrack_max",
	402	.data = &nf_conntrack_max,
	403	.maxlen = sizeof(int),
	404	.mode = 0644,
	405	.proc_handler = proc_dointvec,
	406	},
	407	{ }
	408	};
	409
	410	static struct ctl_path nf_ct_path[] = {
	411	{ .procname = "net", },
	412	{ }
	413	};
	414
	415	static int nf_conntrack_standalone_init_sysctl(struct net *net)
	416	{
	417	struct ctl_table *table;
	418
	419	if (net_eq(net, &init_net)) {
	420	nf_ct_netfilter_header =
	421	register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
	422	if (!nf_ct_netfilter_header)
	423	goto out;
	424	}
	425
	426	table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
	427	GFP_KERNEL);
	428	if (!table)
	429	goto out_kmemdup;
	430
	431	table[1].data = &net->ct.count;
	432	table[2].data = &net->ct.htable_size;
	433	table[3].data = &net->ct.sysctl_checksum;
	434	table[4].data = &net->ct.sysctl_log_invalid;
	435
	436	net->ct.sysctl_header = register_net_sysctl_table(net,
	437	nf_net_netfilter_sysctl_path, table);
	438	if (!net->ct.sysctl_header)
	439	goto out_unregister_netfilter;
	440
	441	return 0;
	442
	443	out_unregister_netfilter:
	444	kfree(table);
	445	out_kmemdup:
	446	if (net_eq(net, &init_net))
	447	unregister_sysctl_table(nf_ct_netfilter_header);
	448	out:
	449	printk(KERN_ERR "nf_conntrack: can't register to sysctl.\n");
	450	return -ENOMEM;
	451	}
	452
	453	static void nf_conntrack_standalone_fini_sysctl(struct net *net)
	454	{
	455	struct ctl_table *table;
	456
	457	if (net_eq(net, &init_net))
	458	unregister_sysctl_table(nf_ct_netfilter_header);
	459	table = net->ct.sysctl_header->ctl_table_arg;
	460	unregister_net_sysctl_table(net->ct.sysctl_header);
	461	kfree(table);
	462	}
	463	#else
	464	static int nf_conntrack_standalone_init_sysctl(struct net *net)
	465	{
	466	return 0;
	467	}
	468
	469	static void nf_conntrack_standalone_fini_sysctl(struct net *net)
	470	{
	471	}
	472	#endif /* CONFIG_SYSCTL */
	473
	474	static int nf_conntrack_net_init(struct net *net)
	475	{
	476	int ret;
	477
	478	ret = nf_conntrack_init(net);
	479	if (ret < 0)
	480	goto out_init;
	481	ret = nf_conntrack_standalone_init_proc(net);
	482	if (ret < 0)
	483	goto out_proc;
	484	net->ct.sysctl_checksum = 1;
	485	net->ct.sysctl_log_invalid = 0;
	486	ret = nf_conntrack_standalone_init_sysctl(net);
	487	if (ret < 0)
	488	goto out_sysctl;
	489	return 0;
	490
	491	out_sysctl:
	492	nf_conntrack_standalone_fini_proc(net);
	493	out_proc:
	494	nf_conntrack_cleanup(net);
	495	out_init:
	496	return ret;
	497	}
	498
	499	static void nf_conntrack_net_exit(struct net *net)
	500	{
	501	nf_conntrack_standalone_fini_sysctl(net);
	502	nf_conntrack_standalone_fini_proc(net);
	503	nf_conntrack_cleanup(net);
	504	}
	505
	506	static struct pernet_operations nf_conntrack_net_ops = {
	507	.init = nf_conntrack_net_init,
	508	.exit = nf_conntrack_net_exit,
	509	};
	510
	511	static int __init nf_conntrack_standalone_init(void)
	512	{
	513	return register_pernet_subsys(&nf_conntrack_net_ops);
	514	}
	515
	516	static void __exit nf_conntrack_standalone_fini(void)
	517	{
	518	unregister_pernet_subsys(&nf_conntrack_net_ops);
	519	}
	520
	521	module_init(nf_conntrack_standalone_init);
	522	module_exit(nf_conntrack_standalone_fini);
	523
	524	/* Some modules need us, but don't depend directly on any symbol.
	525	They should call this. */
	526	void need_conntrack(void)
	527	{
	528	}
	529	EXPORT_SYMBOL_GPL(need_conntrack);