net/netfilter/nf_conntrack_standalone.c - kernel/skids - Git at Google

 /* (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);
	/* (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);