net/netfilter/nf_conntrack_netlink.c


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/* Connection tracking via netlink socket. Allows for user space
 * protocol helpers and general trouble making from userspace.
 *
 * (C) 2001 by Jay Schulist <jschlst@samba.org>
 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * Initial connection tracking via netlink development funded and
 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
 *
 * Further development of this code funded by Astaro AG (http://www.astaro.com)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rculist.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>

#include <linux/netfilter.h>
#include <net/netlink.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_acct.h>
#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_protocol.h>
#endif

#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>

MODULE_LICENSE("GPL");

static char __initdata version[] = "0.93";

static inline int
ctnetlink_dump_tuples_proto(struct sk_buff *skb,
			    const struct nf_conntrack_tuple *tuple,
			    struct nf_conntrack_l4proto *l4proto)
{
	int ret = 0;
	struct nlattr *nest_parms;

	nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
	if (!nest_parms)
		goto nla_put_failure;
	NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);

	if (likely(l4proto->tuple_to_nlattr))
		ret = l4proto->tuple_to_nlattr(skb, tuple);

	nla_nest_end(skb, nest_parms);

	return ret;

nla_put_failure:
	return -1;
}

static inline int
ctnetlink_dump_tuples_ip(struct sk_buff *skb,
			 const struct nf_conntrack_tuple *tuple,
			 struct nf_conntrack_l3proto *l3proto)
{
	int ret = 0;
	struct nlattr *nest_parms;

	nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
	if (!nest_parms)
		goto nla_put_failure;

	if (likely(l3proto->tuple_to_nlattr))
		ret = l3proto->tuple_to_nlattr(skb, tuple);

	nla_nest_end(skb, nest_parms);

	return ret;

nla_put_failure:
	return -1;
}

static int
ctnetlink_dump_tuples(struct sk_buff *skb,
		      const struct nf_conntrack_tuple *tuple)
{
	int ret;
	struct nf_conntrack_l3proto *l3proto;
	struct nf_conntrack_l4proto *l4proto;

	l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
	ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
	nf_ct_l3proto_put(l3proto);

	if (unlikely(ret < 0))
		return ret;

	l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
	ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
	nf_ct_l4proto_put(l4proto);

	return ret;
}

static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
	NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
	return 0;

nla_put_failure:
	return -1;
}

static inline int
ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
{
	long timeout = (ct->timeout.expires - jiffies) / HZ;

	if (timeout < 0)
		timeout = 0;

	NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
	return 0;

nla_put_failure:
	return -1;
}

static inline int
ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
{
	struct nf_conntrack_l4proto *l4proto;
	struct nlattr *nest_proto;
	int ret;

	l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
	if (!l4proto->to_nlattr) {
		nf_ct_l4proto_put(l4proto);
		return 0;
	}

	nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
	if (!nest_proto)
		goto nla_put_failure;

	ret = l4proto->to_nlattr(skb, nest_proto, ct);

	nf_ct_l4proto_put(l4proto);

	nla_nest_end(skb, nest_proto);

	return ret;

nla_put_failure:
	nf_ct_l4proto_put(l4proto);
	return -1;
}

static inline int
ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
{
	struct nlattr *nest_helper;
	const struct nf_conn_help *help = nfct_help(ct);
	struct nf_conntrack_helper *helper;

	if (!help)
		return 0;

	rcu_read_lock();
	helper = rcu_dereference(help->helper);
	if (!helper)
		goto out;

	nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
	if (!nest_helper)
		goto nla_put_failure;
	NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);

	if (helper->to_nlattr)
		helper->to_nlattr(skb, ct);

	nla_nest_end(skb, nest_helper);
out:
	rcu_read_unlock();
	return 0;

nla_put_failure:
	rcu_read_unlock();
	return -1;
}

static int
ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
			enum ip_conntrack_dir dir)
{
	enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
	struct nlattr *nest_count;
	const struct nf_conn_counter *acct;

	acct = nf_conn_acct_find(ct);
	if (!acct)
		return 0;

	nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
	if (!nest_count)
		goto nla_put_failure;

	NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,