net/netfilter/nf_conntrack_proto_udp.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /* (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
  */

 #include <linux/types.h>
 #include <linux/timer.h>
 #include <linux/module.h>
 #include <linux/udp.h>
 #include <linux/seq_file.h>
 #include <linux/skbuff.h>
 #include <linux/ipv6.h>
 #include <net/ip6_checksum.h>
 #include <net/checksum.h>

 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter_ipv6.h>
 #include <net/netfilter/nf_conntrack_l4proto.h>
 #include <net/netfilter/nf_conntrack_ecache.h>
 #include <net/netfilter/nf_conntrack_timeout.h>
 #include <net/netfilter/nf_log.h>
 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>

 static const unsigned int udp_timeouts[UDP_CT_MAX] = {
 	[UDP_CT_UNREPLIED]	= 30*HZ,
 	[UDP_CT_REPLIED]	= 120*HZ,
 };

 static unsigned int *udp_get_timeouts(struct net *net)
 {
 	return nf_udp_pernet(net)->timeouts;
 }

 static void udp_error_log(const struct sk_buff *skb,
 			  const struct nf_hook_state *state,
 			  const char *msg)
 {
 	nf_l4proto_log_invalid(skb, state, IPPROTO_UDP, "%s", msg);
 }

 static bool udp_error(struct sk_buff *skb,
 		      unsigned int dataoff,
 		      const struct nf_hook_state *state)
 {
 	unsigned int udplen = skb->len - dataoff;
 	const struct udphdr *hdr;
 	struct udphdr _hdr;

 	/* Header is too small? */
 	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
 	if (!hdr) {
 		udp_error_log(skb, state, "short packet");
 		return true;
 	}

 	/* Truncated/malformed packets */
 	if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
 		udp_error_log(skb, state, "truncated/malformed packet");
 		return true;
 	}

 	/* Packet with no checksum */
 	if (!hdr->check)
 		return false;

 	/* Checksum invalid? Ignore.
 	 * We skip checking packets on the outgoing path
 	 * because the checksum is assumed to be correct.
 	 * FIXME: Source route IP option packets --RR */
 	if (state->hook == NF_INET_PRE_ROUTING &&
 	    state->net->ct.sysctl_checksum &&
 	    nf_checksum(skb, state->hook, dataoff, IPPROTO_UDP, state->pf)) {
 		udp_error_log(skb, state, "bad checksum");
 		return true;
 	}

 	return false;
 }

 /* Returns verdict for packet, and may modify conntracktype */
 int nf_conntrack_udp_packet(struct nf_conn *ct,
 			    struct sk_buff *skb,
 			    unsigned int dataoff,
 			    enum ip_conntrack_info ctinfo,
 			    const struct nf_hook_state *state)
 {
 	unsigned int *timeouts;
 	unsigned long status;

 	if (udp_error(skb, dataoff, state))
 		return -NF_ACCEPT;

 	timeouts = nf_ct_timeout_lookup(ct);
 	if (!timeouts)
 		timeouts = udp_get_timeouts(nf_ct_net(ct));

 	status = READ_ONCE(ct->status);
 	if ((status & IPS_CONFIRMED) == 0)
 		ct->proto.udp.stream_ts = 2 * HZ + jiffies;

 	/* If we've seen traffic both ways, this is some kind of UDP
 	 * stream. Set Assured.
 	 */
 	if (status & IPS_SEEN_REPLY) {
 		unsigned long extra = timeouts[UDP_CT_UNREPLIED];
 		bool stream = false;

 		/* Still active after two seconds? Extend timeout. */
 		if (time_after(jiffies, ct->proto.udp.stream_ts)) {
 			extra = timeouts[UDP_CT_REPLIED];
 			stream = (status & IPS_ASSURED) == 0;
 		}

 		nf_ct_refresh_acct(ct, ctinfo, skb, extra);

 		/* never set ASSURED for IPS_NAT_CLASH, they time out soon */
 		if (unlikely((status & IPS_NAT_CLASH)))
 			return NF_ACCEPT;

 		/* Also, more likely to be important, and not a probe */
 		if (stream && !test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
 			nf_conntrack_event_cache(IPCT_ASSURED, ct);
 	} else {
 		nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[UDP_CT_UNREPLIED]);
 	}
 	return NF_ACCEPT;
 }

 #ifdef CONFIG_NF_CT_PROTO_UDPLITE
 static void udplite_error_log(const struct sk_buff *skb,
 			      const struct nf_hook_state *state,
 			      const char *msg)
 {
 	nf_l4proto_log_invalid(skb, state, IPPROTO_UDPLITE, "%s", msg);
 }

 static bool udplite_error(struct sk_buff *skb,
 			  unsigned int dataoff,
 			  const struct nf_hook_state *state)
 {
 	unsigned int udplen = skb->len - dataoff;
 	const struct udphdr *hdr;
 	struct udphdr _hdr;
 	unsigned int cscov;

 	/* Header is too small? */
 	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
 	if (!hdr) {
 		udplite_error_log(skb, state, "short packet");
 		return true;
 	}

 	cscov = ntohs(hdr->len);
 	if (cscov == 0) {
 		cscov = udplen;
 	} else if (cscov < sizeof(*hdr) || cscov > udplen) {
 		udplite_error_log(skb, state, "invalid checksum coverage");
 		return true;
 	}

 	/* UDPLITE mandates checksums */
 	if (!hdr->check) {
 		udplite_error_log(skb, state, "checksum missing");
 		return true;
 	}

 	/* Checksum invalid? Ignore. */
 	if (state->hook == NF_INET_PRE_ROUTING &&
 	    state->net->ct.sysctl_checksum &&
 	    nf_checksum_partial(skb, state->hook, dataoff, cscov, IPPROTO_UDP,
 				state->pf)) {
 		udplite_error_log(skb, state, "bad checksum");
 		return true;
 	}

 	return false;
 }

 /* Returns verdict for packet, and may modify conntracktype */
 int nf_conntrack_udplite_packet(struct nf_conn *ct,
 				struct sk_buff *skb,
 				unsigned int dataoff,
 				enum ip_conntrack_info ctinfo,
 				const struct nf_hook_state *state)
 {
 	unsigned int *timeouts;

 	if (udplite_error(skb, dataoff, state))
 		return -NF_ACCEPT;

 	timeouts = nf_ct_timeout_lookup(ct);
 	if (!timeouts)
 		timeouts = udp_get_timeouts(nf_ct_net(ct));

 	/* If we've seen traffic both ways, this is some kind of UDP
 	   stream.  Extend timeout. */
 	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
 		nf_ct_refresh_acct(ct, ctinfo, skb,
 				   timeouts[UDP_CT_REPLIED]);

 		if (unlikely((ct->status & IPS_NAT_CLASH)))
 			return NF_ACCEPT;

 		/* Also, more likely to be important, and not a probe */
 		if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
 			nf_conntrack_event_cache(IPCT_ASSURED, ct);
 	} else {
 		nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[UDP_CT_UNREPLIED]);
 	}
 	return NF_ACCEPT;
 }
 #endif

 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT

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

 static int udp_timeout_nlattr_to_obj(struct nlattr *tb[],
 				     struct net *net, void *data)
 {
 	unsigned int *timeouts = data;
 	struct nf_udp_net *un = nf_udp_pernet(net);

 	if (!timeouts)
 		timeouts = un->timeouts;

 	/* set default timeouts for UDP. */
 	timeouts[UDP_CT_UNREPLIED] = un->timeouts[UDP_CT_UNREPLIED];
 	timeouts[UDP_CT_REPLIED] = un->timeouts[UDP_CT_REPLIED];

 	if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) {
 		timeouts[UDP_CT_UNREPLIED] =
 			ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ;
 	}
 	if (tb[CTA_TIMEOUT_UDP_REPLIED]) {
 		timeouts[UDP_CT_REPLIED] =
 			ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ;
 	}
 	return 0;
 }

 static int
 udp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
 {
 	const unsigned int *timeouts = data;

 	if (nla_put_be32(skb, CTA_TIMEOUT_UDP_UNREPLIED,
 			 htonl(timeouts[UDP_CT_UNREPLIED] / HZ)) ||
 	    nla_put_be32(skb, CTA_TIMEOUT_UDP_REPLIED,
 			 htonl(timeouts[UDP_CT_REPLIED] / HZ)))
 		goto nla_put_failure;
 	return 0;

 nla_put_failure:
 	return -ENOSPC;
 }

 static const struct nla_policy
 udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = {
        [CTA_TIMEOUT_UDP_UNREPLIED]	= { .type = NLA_U32 },
        [CTA_TIMEOUT_UDP_REPLIED]	= { .type = NLA_U32 },
 };
 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */

 void nf_conntrack_udp_init_net(struct net *net)
 {
 	struct nf_udp_net *un = nf_udp_pernet(net);
 	int i;

 	for (i = 0; i < UDP_CT_MAX; i++)
 		un->timeouts[i] = udp_timeouts[i];

 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
 	un->offload_timeout = 30 * HZ;
 #endif
 }

 const struct nf_conntrack_l4proto nf_conntrack_l4proto_udp =
 {
 	.l4proto		= IPPROTO_UDP,
 	.allow_clash		= true,
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 	.ctnl_timeout		= {
 		.nlattr_to_obj	= udp_timeout_nlattr_to_obj,
 		.obj_to_nlattr	= udp_timeout_obj_to_nlattr,
 		.nlattr_max	= CTA_TIMEOUT_UDP_MAX,
 		.obj_size	= sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
 		.nla_policy	= udp_timeout_nla_policy,
 	},
 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 };

 #ifdef CONFIG_NF_CT_PROTO_UDPLITE
 const struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite =
 {
 	.l4proto		= IPPROTO_UDPLITE,
 	.allow_clash		= true,
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 	.ctnl_timeout		= {
 		.nlattr_to_obj	= udp_timeout_nlattr_to_obj,
 		.obj_to_nlattr	= udp_timeout_obj_to_nlattr,
 		.nlattr_max	= CTA_TIMEOUT_UDP_MAX,
 		.obj_size	= sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
 		.nla_policy	= udp_timeout_nla_policy,
 	},
 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 };
 #endif
	// SPDX-License-Identifier: GPL-2.0-only
	/* (C) 1999-2001 Paul `Rusty' Russell
	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
	*/

	#include <linux/types.h>
	#include <linux/timer.h>
	#include <linux/module.h>
	#include <linux/udp.h>
	#include <linux/seq_file.h>
	#include <linux/skbuff.h>
	#include <linux/ipv6.h>
	#include <net/ip6_checksum.h>
	#include <net/checksum.h>

	#include <linux/netfilter.h>
	#include <linux/netfilter_ipv4.h>
	#include <linux/netfilter_ipv6.h>
	#include <net/netfilter/nf_conntrack_l4proto.h>
	#include <net/netfilter/nf_conntrack_ecache.h>
	#include <net/netfilter/nf_conntrack_timeout.h>
	#include <net/netfilter/nf_log.h>
	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>

	static const unsigned int udp_timeouts[UDP_CT_MAX] = {
	[UDP_CT_UNREPLIED] = 30*HZ,
	[UDP_CT_REPLIED] = 120*HZ,
	};

	static unsigned int udp_get_timeouts(struct net net)
	{
	return nf_udp_pernet(net)->timeouts;
	}

	static void udp_error_log(const struct sk_buff *skb,
	const struct nf_hook_state *state,
	const char *msg)
	{
	nf_l4proto_log_invalid(skb, state, IPPROTO_UDP, "%s", msg);
	}

	static bool udp_error(struct sk_buff *skb,
	unsigned int dataoff,
	const struct nf_hook_state *state)
	{
	unsigned int udplen = skb->len - dataoff;
	const struct udphdr *hdr;
	struct udphdr _hdr;

	/* Header is too small? */
	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	if (!hdr) {
	udp_error_log(skb, state, "short packet");
	return true;
	}

	/* Truncated/malformed packets */
	if (ntohs(hdr->len) > udplen \|\| ntohs(hdr->len) < sizeof(*hdr)) {
	udp_error_log(skb, state, "truncated/malformed packet");
	return true;
	}

	/* Packet with no checksum */
	if (!hdr->check)
	return false;

	/* Checksum invalid? Ignore.
	* We skip checking packets on the outgoing path
	* because the checksum is assumed to be correct.
	* FIXME: Source route IP option packets --RR */
	if (state->hook == NF_INET_PRE_ROUTING &&
	state->net->ct.sysctl_checksum &&
	nf_checksum(skb, state->hook, dataoff, IPPROTO_UDP, state->pf)) {
	udp_error_log(skb, state, "bad checksum");
	return true;
	}

	return false;
	}

	/* Returns verdict for packet, and may modify conntracktype */
	int nf_conntrack_udp_packet(struct nf_conn *ct,
	struct sk_buff *skb,
	unsigned int dataoff,
	enum ip_conntrack_info ctinfo,
	const struct nf_hook_state *state)
	{
	unsigned int *timeouts;
	unsigned long status;

	if (udp_error(skb, dataoff, state))
	return -NF_ACCEPT;

	timeouts = nf_ct_timeout_lookup(ct);
	if (!timeouts)
	timeouts = udp_get_timeouts(nf_ct_net(ct));

	status = READ_ONCE(ct->status);
	if ((status & IPS_CONFIRMED) == 0)
	ct->proto.udp.stream_ts = 2 * HZ + jiffies;

	/* If we've seen traffic both ways, this is some kind of UDP
	* stream. Set Assured.
	*/
	if (status & IPS_SEEN_REPLY) {
	unsigned long extra = timeouts[UDP_CT_UNREPLIED];
	bool stream = false;

	/* Still active after two seconds? Extend timeout. */
	if (time_after(jiffies, ct->proto.udp.stream_ts)) {
	extra = timeouts[UDP_CT_REPLIED];
	stream = (status & IPS_ASSURED) == 0;
	}

	nf_ct_refresh_acct(ct, ctinfo, skb, extra);

	/* never set ASSURED for IPS_NAT_CLASH, they time out soon */
	if (unlikely((status & IPS_NAT_CLASH)))
	return NF_ACCEPT;

	/* Also, more likely to be important, and not a probe */
	if (stream && !test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
	nf_conntrack_event_cache(IPCT_ASSURED, ct);
	} else {
	nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[UDP_CT_UNREPLIED]);
	}
	return NF_ACCEPT;
	}

	#ifdef CONFIG_NF_CT_PROTO_UDPLITE
	static void udplite_error_log(const struct sk_buff *skb,
	const struct nf_hook_state *state,
	const char *msg)
	{
	nf_l4proto_log_invalid(skb, state, IPPROTO_UDPLITE, "%s", msg);
	}

	static bool udplite_error(struct sk_buff *skb,
	unsigned int dataoff,
	const struct nf_hook_state *state)
	{
	unsigned int udplen = skb->len - dataoff;
	const struct udphdr *hdr;
	struct udphdr _hdr;
	unsigned int cscov;

	/* Header is too small? */
	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	if (!hdr) {
	udplite_error_log(skb, state, "short packet");
	return true;
	}

	cscov = ntohs(hdr->len);
	if (cscov == 0) {
	cscov = udplen;
	} else if (cscov < sizeof(*hdr) \|\| cscov > udplen) {
	udplite_error_log(skb, state, "invalid checksum coverage");
	return true;
	}

	/* UDPLITE mandates checksums */
	if (!hdr->check) {
	udplite_error_log(skb, state, "checksum missing");
	return true;
	}

	/* Checksum invalid? Ignore. */
	if (state->hook == NF_INET_PRE_ROUTING &&
	state->net->ct.sysctl_checksum &&
	nf_checksum_partial(skb, state->hook, dataoff, cscov, IPPROTO_UDP,
	state->pf)) {
	udplite_error_log(skb, state, "bad checksum");
	return true;
	}

	return false;
	}

	/* Returns verdict for packet, and may modify conntracktype */
	int nf_conntrack_udplite_packet(struct nf_conn *ct,
	struct sk_buff *skb,
	unsigned int dataoff,
	enum ip_conntrack_info ctinfo,
	const struct nf_hook_state *state)
	{
	unsigned int *timeouts;

	if (udplite_error(skb, dataoff, state))
	return -NF_ACCEPT;

	timeouts = nf_ct_timeout_lookup(ct);
	if (!timeouts)
	timeouts = udp_get_timeouts(nf_ct_net(ct));

	/* If we've seen traffic both ways, this is some kind of UDP
	stream. Extend timeout. */
	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
	nf_ct_refresh_acct(ct, ctinfo, skb,
	timeouts[UDP_CT_REPLIED]);

	if (unlikely((ct->status & IPS_NAT_CLASH)))
	return NF_ACCEPT;

	/* Also, more likely to be important, and not a probe */
	if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
	nf_conntrack_event_cache(IPCT_ASSURED, ct);
	} else {
	nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[UDP_CT_UNREPLIED]);
	}
	return NF_ACCEPT;
	}
	#endif

	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT

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

	static int udp_timeout_nlattr_to_obj(struct nlattr *tb[],
	struct net net, void data)
	{
	unsigned int *timeouts = data;
	struct nf_udp_net *un = nf_udp_pernet(net);

	if (!timeouts)
	timeouts = un->timeouts;

	/* set default timeouts for UDP. */
	timeouts[UDP_CT_UNREPLIED] = un->timeouts[UDP_CT_UNREPLIED];
	timeouts[UDP_CT_REPLIED] = un->timeouts[UDP_CT_REPLIED];

	if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) {
	timeouts[UDP_CT_UNREPLIED] =
	ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ;
	}
	if (tb[CTA_TIMEOUT_UDP_REPLIED]) {
	timeouts[UDP_CT_REPLIED] =
	ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ;
	}
	return 0;
	}

	static int
	udp_timeout_obj_to_nlattr(struct sk_buff skb, const void data)
	{
	const unsigned int *timeouts = data;

	if (nla_put_be32(skb, CTA_TIMEOUT_UDP_UNREPLIED,
	htonl(timeouts[UDP_CT_UNREPLIED] / HZ)) \|\|
	nla_put_be32(skb, CTA_TIMEOUT_UDP_REPLIED,
	htonl(timeouts[UDP_CT_REPLIED] / HZ)))
	goto nla_put_failure;
	return 0;

	nla_put_failure:
	return -ENOSPC;
	}

	static const struct nla_policy
	udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = {
	[CTA_TIMEOUT_UDP_UNREPLIED] = { .type = NLA_U32 },
	[CTA_TIMEOUT_UDP_REPLIED] = { .type = NLA_U32 },
	};
	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */

	void nf_conntrack_udp_init_net(struct net *net)
	{
	struct nf_udp_net *un = nf_udp_pernet(net);
	int i;

	for (i = 0; i < UDP_CT_MAX; i++)
	un->timeouts[i] = udp_timeouts[i];

	#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
	un->offload_timeout = 30 * HZ;
	#endif
	}

	const struct nf_conntrack_l4proto nf_conntrack_l4proto_udp =
	{
	.l4proto = IPPROTO_UDP,
	.allow_clash = true,
	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
	.nla_policy = nf_ct_port_nla_policy,
	#endif
	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	.ctnl_timeout = {
	.nlattr_to_obj = udp_timeout_nlattr_to_obj,
	.obj_to_nlattr = udp_timeout_obj_to_nlattr,
	.nlattr_max = CTA_TIMEOUT_UDP_MAX,
	.obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
	.nla_policy = udp_timeout_nla_policy,
	},
	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
	};

	#ifdef CONFIG_NF_CT_PROTO_UDPLITE
	const struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite =
	{
	.l4proto = IPPROTO_UDPLITE,
	.allow_clash = true,
	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
	.nla_policy = nf_ct_port_nla_policy,
	#endif
	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	.ctnl_timeout = {
	.nlattr_to_obj = udp_timeout_nlattr_to_obj,
	.obj_to_nlattr = udp_timeout_obj_to_nlattr,
	.nlattr_max = CTA_TIMEOUT_UDP_MAX,
	.obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
	.nla_policy = udp_timeout_nla_policy,
	},
	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
	};
	#endif