net/netfilter/nf_conntrack_proto_udp.c - kernel/common.git - Git at Google

 /* (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
  *
  * 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/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_log.h>
 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>

 static unsigned int udp_timeouts[UDP_CT_MAX] = {
 	[UDP_CT_UNREPLIED]	= 30*HZ,
 	[UDP_CT_REPLIED]	= 180*HZ,
 };

 static inline struct nf_udp_net *udp_pernet(struct net *net)
 {
 	return &net->ct.nf_ct_proto.udp;
 }

 static bool udp_pkt_to_tuple(const struct sk_buff *skb,
 			     unsigned int dataoff,
 			     struct net *net,
 			     struct nf_conntrack_tuple *tuple)
 {
 	const struct udphdr *hp;
 	struct udphdr _hdr;

 	/* Actually only need first 4 bytes to get ports. */
 	hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
 	if (hp == NULL)
 		return false;

 	tuple->src.u.udp.port = hp->source;
 	tuple->dst.u.udp.port = hp->dest;

 	return true;
 }

 static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple,
 			     const struct nf_conntrack_tuple *orig)
 {
 	tuple->src.u.udp.port = orig->dst.u.udp.port;
 	tuple->dst.u.udp.port = orig->src.u.udp.port;
 	return true;
 }

 /* Print out the per-protocol part of the tuple. */
 static void udp_print_tuple(struct seq_file *s,
 			    const struct nf_conntrack_tuple *tuple)
 {
 	seq_printf(s, "sport=%hu dport=%hu ",
 		   ntohs(tuple->src.u.udp.port),
 		   ntohs(tuple->dst.u.udp.port));
 }

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

 /* Returns verdict for packet, and may modify conntracktype */
 static int udp_packet(struct nf_conn *ct,
 		      const struct sk_buff *skb,
 		      unsigned int dataoff,
 		      enum ip_conntrack_info ctinfo,
 		      u_int8_t pf,
 		      unsigned int hooknum,
 		      unsigned int *timeouts)
 {
 	/* 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]);
 		/* 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;
 }

 /* Called when a new connection for this protocol found. */
 static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb,
 		    unsigned int dataoff, unsigned int *timeouts)
 {
 	return true;
 }

 static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
 		     unsigned int dataoff, enum ip_conntrack_info *ctinfo,
 		     u_int8_t pf,
 		     unsigned int hooknum)
 {
 	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 == NULL) {
 		if (LOG_INVALID(net, IPPROTO_UDP))
 			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
 				      "nf_ct_udp: short packet ");
 		return -NF_ACCEPT;
 	}

 	/* Truncated/malformed packets */
 	if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
 		if (LOG_INVALID(net, IPPROTO_UDP))
 			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
 				"nf_ct_udp: truncated/malformed packet ");
 		return -NF_ACCEPT;
 	}

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

 	/* 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 (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
 	    nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
 		if (LOG_INVALID(net, IPPROTO_UDP))
 			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
 				"nf_ct_udp: bad UDP checksum ");
 		return -NF_ACCEPT;
 	}

 	return NF_ACCEPT;
 }

 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_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 = udp_pernet(net);

 	/* 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_CT_NETLINK_TIMEOUT */

 #ifdef CONFIG_SYSCTL
 static struct ctl_table udp_sysctl_table[] = {
 	{
 		.procname	= "nf_conntrack_udp_timeout",
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
 	{
 		.procname	= "nf_conntrack_udp_timeout_stream",
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
 	{ }
 };
 #endif /* CONFIG_SYSCTL */

 static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn,
 				    struct nf_udp_net *un)
 {
 #ifdef CONFIG_SYSCTL
 	if (pn->ctl_table)
 		return 0;
 	pn->ctl_table = kmemdup(udp_sysctl_table,
 				sizeof(udp_sysctl_table),
 				GFP_KERNEL);
 	if (!pn->ctl_table)
 		return -ENOMEM;
 	pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED];
 	pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED];
 #endif
 	return 0;
 }

 static int udp_init_net(struct net *net, u_int16_t proto)
 {
 	struct nf_udp_net *un = udp_pernet(net);
 	struct nf_proto_net *pn = &un->pn;

 	if (!pn->users) {
 		int i;

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

 	return udp_kmemdup_sysctl_table(pn, un);
 }

 static struct nf_proto_net *udp_get_net_proto(struct net *net)
 {
 	return &net->ct.nf_ct_proto.udp.pn;
 }

 struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
 {
 	.l3proto		= PF_INET,
 	.l4proto		= IPPROTO_UDP,
 	.name			= "udp",
 	.allow_clash		= true,
 	.pkt_to_tuple		= udp_pkt_to_tuple,
 	.invert_tuple		= udp_invert_tuple,
 	.print_tuple		= udp_print_tuple,
 	.packet			= udp_packet,
 	.get_timeouts		= udp_get_timeouts,
 	.new			= udp_new,
 	.error			= udp_error,
 #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
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_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_CT_NETLINK_TIMEOUT */
 	.init_net		= udp_init_net,
 	.get_net_proto		= udp_get_net_proto,
 };
 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);

 struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
 {
 	.l3proto		= PF_INET6,
 	.l4proto		= IPPROTO_UDP,
 	.name			= "udp",
 	.allow_clash		= true,
 	.pkt_to_tuple		= udp_pkt_to_tuple,
 	.invert_tuple		= udp_invert_tuple,
 	.print_tuple		= udp_print_tuple,
 	.packet			= udp_packet,
 	.get_timeouts		= udp_get_timeouts,
 	.new			= udp_new,
 	.error			= udp_error,
 #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
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_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_CT_NETLINK_TIMEOUT */
 	.init_net		= udp_init_net,
 	.get_net_proto		= udp_get_net_proto,
 };
 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);
	/* (C) 1999-2001 Paul `Rusty' Russell
	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
	*
	* 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/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_log.h>
	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>

	static unsigned int udp_timeouts[UDP_CT_MAX] = {
	[UDP_CT_UNREPLIED] = 30*HZ,
	[UDP_CT_REPLIED] = 180*HZ,
	};

	static inline struct nf_udp_net udp_pernet(struct net net)
	{
	return &net->ct.nf_ct_proto.udp;
	}

	static bool udp_pkt_to_tuple(const struct sk_buff *skb,
	unsigned int dataoff,
	struct net *net,
	struct nf_conntrack_tuple *tuple)
	{
	const struct udphdr *hp;
	struct udphdr _hdr;

	/* Actually only need first 4 bytes to get ports. */
	hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
	if (hp == NULL)
	return false;

	tuple->src.u.udp.port = hp->source;
	tuple->dst.u.udp.port = hp->dest;

	return true;
	}

	static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple,
	const struct nf_conntrack_tuple *orig)
	{
	tuple->src.u.udp.port = orig->dst.u.udp.port;
	tuple->dst.u.udp.port = orig->src.u.udp.port;
	return true;
	}

	/* Print out the per-protocol part of the tuple. */
	static void udp_print_tuple(struct seq_file *s,
	const struct nf_conntrack_tuple *tuple)
	{
	seq_printf(s, "sport=%hu dport=%hu ",
	ntohs(tuple->src.u.udp.port),
	ntohs(tuple->dst.u.udp.port));
	}

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

	/* Returns verdict for packet, and may modify conntracktype */
	static int udp_packet(struct nf_conn *ct,
	const struct sk_buff *skb,
	unsigned int dataoff,
	enum ip_conntrack_info ctinfo,
	u_int8_t pf,
	unsigned int hooknum,
	unsigned int *timeouts)
	{
	/* 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]);
	/* 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;
	}

	/* Called when a new connection for this protocol found. */
	static bool udp_new(struct nf_conn ct, const struct sk_buff skb,
	unsigned int dataoff, unsigned int *timeouts)
	{
	return true;
	}

	static int udp_error(struct net net, struct nf_conn tmpl, struct sk_buff *skb,
	unsigned int dataoff, enum ip_conntrack_info *ctinfo,
	u_int8_t pf,
	unsigned int hooknum)
	{
	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 == NULL) {
	if (LOG_INVALID(net, IPPROTO_UDP))
	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	"nf_ct_udp: short packet ");
	return -NF_ACCEPT;
	}

	/* Truncated/malformed packets */
	if (ntohs(hdr->len) > udplen \|\| ntohs(hdr->len) < sizeof(*hdr)) {
	if (LOG_INVALID(net, IPPROTO_UDP))
	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	"nf_ct_udp: truncated/malformed packet ");
	return -NF_ACCEPT;
	}

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

	/* 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 (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
	nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
	if (LOG_INVALID(net, IPPROTO_UDP))
	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	"nf_ct_udp: bad UDP checksum ");
	return -NF_ACCEPT;
	}

	return NF_ACCEPT;
	}

	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_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 = udp_pernet(net);

	/* 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_CT_NETLINK_TIMEOUT */

	#ifdef CONFIG_SYSCTL
	static struct ctl_table udp_sysctl_table[] = {
	{
	.procname = "nf_conntrack_udp_timeout",
	.maxlen = sizeof(unsigned int),
	.mode = 0644,
	.proc_handler = proc_dointvec_jiffies,
	},
	{
	.procname = "nf_conntrack_udp_timeout_stream",
	.maxlen = sizeof(unsigned int),
	.mode = 0644,
	.proc_handler = proc_dointvec_jiffies,
	},
	{ }
	};
	#endif /* CONFIG_SYSCTL */

	static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn,
	struct nf_udp_net *un)
	{
	#ifdef CONFIG_SYSCTL
	if (pn->ctl_table)
	return 0;
	pn->ctl_table = kmemdup(udp_sysctl_table,
	sizeof(udp_sysctl_table),
	GFP_KERNEL);
	if (!pn->ctl_table)
	return -ENOMEM;
	pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED];
	pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED];
	#endif
	return 0;
	}

	static int udp_init_net(struct net *net, u_int16_t proto)
	{
	struct nf_udp_net *un = udp_pernet(net);
	struct nf_proto_net *pn = &un->pn;

	if (!pn->users) {
	int i;

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

	return udp_kmemdup_sysctl_table(pn, un);
	}

	static struct nf_proto_net udp_get_net_proto(struct net net)
	{
	return &net->ct.nf_ct_proto.udp.pn;
	}

	struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
	{
	.l3proto = PF_INET,
	.l4proto = IPPROTO_UDP,
	.name = "udp",
	.allow_clash = true,
	.pkt_to_tuple = udp_pkt_to_tuple,
	.invert_tuple = udp_invert_tuple,
	.print_tuple = udp_print_tuple,
	.packet = udp_packet,
	.get_timeouts = udp_get_timeouts,
	.new = udp_new,
	.error = udp_error,
	#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
	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_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_CT_NETLINK_TIMEOUT */
	.init_net = udp_init_net,
	.get_net_proto = udp_get_net_proto,
	};
	EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);

	struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
	{
	.l3proto = PF_INET6,
	.l4proto = IPPROTO_UDP,
	.name = "udp",
	.allow_clash = true,
	.pkt_to_tuple = udp_pkt_to_tuple,
	.invert_tuple = udp_invert_tuple,
	.print_tuple = udp_print_tuple,
	.packet = udp_packet,
	.get_timeouts = udp_get_timeouts,
	.new = udp_new,
	.error = udp_error,
	#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
	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_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_CT_NETLINK_TIMEOUT */
	.init_net = udp_init_net,
	.get_net_proto = udp_get_net_proto,
	};
	EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);