[mirror_ubuntu-artful-kernel.git] / net / netfilter / nf_conntrack_proto_udp.c

/* (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;
}

#ifdef CONFIG_NF_CT_PROTO_UDPLITE
static int udplite_error(struct net *net, struct nf_conn *tmpl,
			 struct sk_buff *skb,
			 unsigned int dataoff,
			 u8 pf, unsigned int hooknum)
{
	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) {
		if (LOG_INVALID(net, IPPROTO_UDPLITE))
			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
				      "nf_ct_udplite: short packet ");
		return -NF_ACCEPT;
	}

	cscov = ntohs(hdr->len);
	if (cscov == 0) {
		cscov = udplen;
	} else if (cscov < sizeof(*hdr) || cscov > udplen) {
		if (LOG_INVALID(net, IPPROTO_UDPLITE))
			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
				      "nf_ct_udplite: invalid checksum coverage ");
		return -NF_ACCEPT;
	}

	/* UDPLITE mandates checksums */
	if (!hdr->check) {
		if (LOG_INVALID(net, IPPROTO_UDPLITE))
			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
				      "nf_ct_udplite: checksum missing ");
		return -NF_ACCEPT;
	}

	/* Checksum invalid? Ignore. */
	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
	    nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
				pf)) {
		if (LOG_INVALID(net, IPPROTO_UDPLITE))
			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
				      "nf_ct_udplite: bad UDPLite checksum ");
		return -NF_ACCEPT;
	}

	return NF_ACCEPT;
}
#endif

static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
		     unsigned int dataoff,
		     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);

#ifdef CONFIG_NF_CT_PROTO_UDPLITE
struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
{
	.l3proto		= PF_INET,
	.l4proto		= IPPROTO_UDPLITE,
	.name			= "udplite",
	.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			= udplite_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_udplite4);
#endif

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);

#ifdef CONFIG_NF_CT_PROTO_UDPLITE
struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
{
	.l3proto		= PF_INET6,
	.l4proto		= IPPROTO_UDPLITE,
	.name			= "udplite",
	.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			= udplite_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_udplite6);
#endif
Commit	Line	Data
9fb9cbb1 YK	1	/* (C) 1999-2001 Paul `Rusty' Russell
9fb9cbb1 YK	2	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
f229f6ce	3	* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
9fb9cbb1 YK	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
9fb9cbb1 YK	8	*/
	9
	10	#include <linux/types.h>
9fb9cbb1 YK	11	#include <linux/timer.h>
9fb9cbb1 YK	12	#include <linux/module.h>
9fb9cbb1 YK	13	#include <linux/udp.h>
	14	#include <linux/seq_file.h>
	15	#include <linux/skbuff.h>
	16	#include <linux/ipv6.h>
	17	#include <net/ip6_checksum.h>
	18	#include <net/checksum.h>
f6180121	19
9fb9cbb1 YK	20	#include <linux/netfilter.h>
	21	#include <linux/netfilter_ipv4.h>
	22	#include <linux/netfilter_ipv6.h>
605dcad6	23	#include <net/netfilter/nf_conntrack_l4proto.h>
f6180121	24	#include <net/netfilter/nf_conntrack_ecache.h>
f01ffbd6	25	#include <net/netfilter/nf_log.h>
9d2493f8 CP	26	#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
9d2493f8 CP	27	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
9fb9cbb1	28
5a41db94 PNA	29	static unsigned int udp_timeouts[UDP_CT_MAX] = {
	30	[UDP_CT_UNREPLIED] = 30*HZ,
	31	[UDP_CT_REPLIED] = 180*HZ,
	32	};
9fb9cbb1	33
0ce490ad G	34	static inline struct nf_udp_net udp_pernet(struct net net)
	35	{
	36	return &net->ct.nf_ct_proto.udp;
	37	}
	38
09f263cd	39	static bool udp_pkt_to_tuple(const struct sk_buff *skb,
9fb9cbb1	40	unsigned int dataoff,
a31f1adc	41	struct net *net,
9fb9cbb1 YK	42	struct nf_conntrack_tuple *tuple)
9fb9cbb1 YK	43	{
da3f13c9 JE	44	const struct udphdr *hp;
da3f13c9 JE	45	struct udphdr _hdr;
9fb9cbb1	46
e5e693ab GF	47	/* Actually only need first 4 bytes to get ports. */
e5e693ab GF	48	hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
9fb9cbb1	49	if (hp == NULL)
09f263cd	50	return false;
9fb9cbb1 YK	51
	52	tuple->src.u.udp.port = hp->source;
	53	tuple->dst.u.udp.port = hp->dest;
	54
09f263cd	55	return true;
9fb9cbb1 YK	56	}
9fb9cbb1 YK	57
09f263cd JE	58	static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple,
09f263cd JE	59	const struct nf_conntrack_tuple *orig)
9fb9cbb1 YK	60	{
	61	tuple->src.u.udp.port = orig->dst.u.udp.port;
	62	tuple->dst.u.udp.port = orig->src.u.udp.port;
09f263cd	63	return true;
9fb9cbb1 YK	64	}
	65
	66	/* Print out the per-protocol part of the tuple. */
824f1fbe JP	67	static void udp_print_tuple(struct seq_file *s,
824f1fbe JP	68	const struct nf_conntrack_tuple *tuple)
9fb9cbb1	69	{
824f1fbe JP	70	seq_printf(s, "sport=%hu dport=%hu ",
	71	ntohs(tuple->src.u.udp.port),
	72	ntohs(tuple->dst.u.udp.port));
9fb9cbb1 YK	73	}
9fb9cbb1 YK	74
2c8503f5 PNA	75	static unsigned int udp_get_timeouts(struct net net)
2c8503f5 PNA	76	{
0ce490ad	77	return udp_pernet(net)->timeouts;
2c8503f5 PNA	78	}
2c8503f5 PNA	79
9fb9cbb1	80	/* Returns verdict for packet, and may modify conntracktype */
c88130bc	81	static int udp_packet(struct nf_conn *ct,
9fb9cbb1 YK	82	const struct sk_buff *skb,
	83	unsigned int dataoff,
	84	enum ip_conntrack_info ctinfo,
76108cea	85	u_int8_t pf,
2c8503f5 PNA	86	unsigned int hooknum,
2c8503f5 PNA	87	unsigned int *timeouts)
9fb9cbb1 YK	88	{
	89	/* If we've seen traffic both ways, this is some kind of UDP
	90	stream. Extend timeout. */
c88130bc	91	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
5a41db94	92	nf_ct_refresh_acct(ct, ctinfo, skb,
2c8503f5	93	timeouts[UDP_CT_REPLIED]);
9fb9cbb1	94	/* Also, more likely to be important, and not a probe */
c88130bc	95	if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
858b3133	96	nf_conntrack_event_cache(IPCT_ASSURED, ct);
5a41db94 PNA	97	} else {
5a41db94 PNA	98	nf_ct_refresh_acct(ct, ctinfo, skb,
2c8503f5	99	timeouts[UDP_CT_UNREPLIED]);
5a41db94	100	}
9fb9cbb1 YK	101	return NF_ACCEPT;
	102	}
	103
	104	/* Called when a new connection for this protocol found. */
09f263cd	105	static bool udp_new(struct nf_conn ct, const struct sk_buff skb,
2c8503f5	106	unsigned int dataoff, unsigned int *timeouts)
9fb9cbb1	107	{
09f263cd	108	return true;
9fb9cbb1 YK	109	}
9fb9cbb1 YK	110
e4781421 FW	111	#ifdef CONFIG_NF_CT_PROTO_UDPLITE
	112	static int udplite_error(struct net net, struct nf_conn tmpl,
	113	struct sk_buff *skb,
	114	unsigned int dataoff,
e4781421 FW	115	u8 pf, unsigned int hooknum)
	116	{
	117	unsigned int udplen = skb->len - dataoff;
	118	const struct udphdr *hdr;
	119	struct udphdr _hdr;
	120	unsigned int cscov;
	121
	122	/* Header is too small? */
	123	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	124	if (!hdr) {
	125	if (LOG_INVALID(net, IPPROTO_UDPLITE))
	126	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	127	"nf_ct_udplite: short packet ");
	128	return -NF_ACCEPT;
	129	}
	130
	131	cscov = ntohs(hdr->len);
	132	if (cscov == 0) {
	133	cscov = udplen;
	134	} else if (cscov < sizeof(*hdr) \|\| cscov > udplen) {
	135	if (LOG_INVALID(net, IPPROTO_UDPLITE))
	136	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	137	"nf_ct_udplite: invalid checksum coverage ");
	138	return -NF_ACCEPT;
	139	}
	140
	141	/* UDPLITE mandates checksums */
	142	if (!hdr->check) {
	143	if (LOG_INVALID(net, IPPROTO_UDPLITE))
	144	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	145	"nf_ct_udplite: checksum missing ");
	146	return -NF_ACCEPT;
	147	}
	148
	149	/* Checksum invalid? Ignore. */
	150	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
	151	nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
	152	pf)) {
	153	if (LOG_INVALID(net, IPPROTO_UDPLITE))
	154	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
	155	"nf_ct_udplite: bad UDPLite checksum ");
	156	return -NF_ACCEPT;
	157	}
	158
	159	return NF_ACCEPT;
	160	}
	161	#endif
	162
8fea97ec	163	static int udp_error(struct net net, struct nf_conn tmpl, struct sk_buff *skb,
11df4b76	164	unsigned int dataoff,
76108cea	165	u_int8_t pf,
96f6bf82	166	unsigned int hooknum)
9fb9cbb1 YK	167	{
9fb9cbb1 YK	168	unsigned int udplen = skb->len - dataoff;
da3f13c9 JE	169	const struct udphdr *hdr;
da3f13c9 JE	170	struct udphdr _hdr;
9fb9cbb1 YK	171
	172	/* Header is too small? */
	173	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	174	if (hdr == NULL) {
c2a2c7e0	175	if (LOG_INVALID(net, IPPROTO_UDP))
30e0c6a6	176	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
9fb9cbb1 YK	177	"nf_ct_udp: short packet ");
	178	return -NF_ACCEPT;
	179	}
	180
	181	/* Truncated/malformed packets */
	182	if (ntohs(hdr->len) > udplen \|\| ntohs(hdr->len) < sizeof(*hdr)) {
c2a2c7e0	183	if (LOG_INVALID(net, IPPROTO_UDP))
30e0c6a6	184	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
9fb9cbb1 YK	185	"nf_ct_udp: truncated/malformed packet ");
	186	return -NF_ACCEPT;
	187	}
	188
	189	/* Packet with no checksum */
	190	if (!hdr->check)
	191	return NF_ACCEPT;
	192
	193	/* Checksum invalid? Ignore.
	194	* We skip checking packets on the outgoing path
84fa7933	195	* because the checksum is assumed to be correct.
9fb9cbb1	196	* FIXME: Source route IP option packets --RR */
c04d0552	197	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	198	nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
c2a2c7e0	199	if (LOG_INVALID(net, IPPROTO_UDP))
30e0c6a6	200	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
9fb9cbb1 YK	201	"nf_ct_udp: bad UDP checksum ");
	202	return -NF_ACCEPT;
	203	}
	204
	205	return NF_ACCEPT;
	206	}
	207
50978462 PNA	208	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	209
	210	#include <linux/netfilter/nfnetlink.h>
	211	#include <linux/netfilter/nfnetlink_cttimeout.h>
	212
8264deb8 G	213	static int udp_timeout_nlattr_to_obj(struct nlattr *tb[],
8264deb8 G	214	struct net net, void data)
50978462 PNA	215	{
50978462 PNA	216	unsigned int *timeouts = data;
8264deb8	217	struct nf_udp_net *un = udp_pernet(net);
50978462 PNA	218
50978462 PNA	219	/* set default timeouts for UDP. */
8264deb8 G	220	timeouts[UDP_CT_UNREPLIED] = un->timeouts[UDP_CT_UNREPLIED];
8264deb8 G	221	timeouts[UDP_CT_REPLIED] = un->timeouts[UDP_CT_REPLIED];
50978462 PNA	222
	223	if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) {
	224	timeouts[UDP_CT_UNREPLIED] =
	225	ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ;
	226	}
	227	if (tb[CTA_TIMEOUT_UDP_REPLIED]) {
	228	timeouts[UDP_CT_REPLIED] =
	229	ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ;
	230	}
	231	return 0;
	232	}
	233
	234	static int
	235	udp_timeout_obj_to_nlattr(struct sk_buff skb, const void data)
	236	{
	237	const unsigned int *timeouts = data;
	238
3c60a17b DM	239	if (nla_put_be32(skb, CTA_TIMEOUT_UDP_UNREPLIED,
	240	htonl(timeouts[UDP_CT_UNREPLIED] / HZ)) \|\|
	241	nla_put_be32(skb, CTA_TIMEOUT_UDP_REPLIED,
	242	htonl(timeouts[UDP_CT_REPLIED] / HZ)))
	243	goto nla_put_failure;
50978462 PNA	244	return 0;
	245
	246	nla_put_failure:
	247	return -ENOSPC;
	248	}
	249
	250	static const struct nla_policy
	251	udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = {
	252	[CTA_TIMEOUT_UDP_UNREPLIED] = { .type = NLA_U32 },
	253	[CTA_TIMEOUT_UDP_REPLIED] = { .type = NLA_U32 },
	254	};
	255	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	256
933a41e7	257	#ifdef CONFIG_SYSCTL
933a41e7 PM	258	static struct ctl_table udp_sysctl_table[] = {
933a41e7 PM	259	{
933a41e7	260	.procname = "nf_conntrack_udp_timeout",
933a41e7 PM	261	.maxlen = sizeof(unsigned int),
933a41e7 PM	262	.mode = 0644,
6d9f239a	263	.proc_handler = proc_dointvec_jiffies,
933a41e7 PM	264	},
933a41e7 PM	265	{
933a41e7	266	.procname = "nf_conntrack_udp_timeout_stream",
933a41e7 PM	267	.maxlen = sizeof(unsigned int),
933a41e7 PM	268	.mode = 0644,
6d9f239a	269	.proc_handler = proc_dointvec_jiffies,
933a41e7	270	},
f8572d8f	271	{ }
933a41e7 PM	272	};
	273	#endif /* CONFIG_SYSCTL */
	274
dee7364e G	275	static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn,
dee7364e G	276	struct nf_udp_net *un)
0ce490ad G	277	{
0ce490ad G	278	#ifdef CONFIG_SYSCTL
0ce490ad G	279	if (pn->ctl_table)
	280	return 0;
	281	pn->ctl_table = kmemdup(udp_sysctl_table,
	282	sizeof(udp_sysctl_table),
	283	GFP_KERNEL);
	284	if (!pn->ctl_table)
	285	return -ENOMEM;
	286	pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED];
	287	pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED];
	288	#endif
	289	return 0;
	290	}
	291
dee7364e	292	static int udp_init_net(struct net *net, u_int16_t proto)
0ce490ad	293	{
0ce490ad	294	struct nf_udp_net *un = udp_pernet(net);
dee7364e	295	struct nf_proto_net *pn = &un->pn;
0ce490ad	296
dee7364e G	297	if (!pn->users) {
dee7364e G	298	int i;
0ce490ad	299
dee7364e G	300	for (i = 0; i < UDP_CT_MAX; i++)
dee7364e G	301	un->timeouts[i] = udp_timeouts[i];
0ce490ad	302	}
0ce490ad	303
adf05168	304	return udp_kmemdup_sysctl_table(pn, un);
0ce490ad G	305	}
0ce490ad G	306
08911475 PNA	307	static struct nf_proto_net udp_get_net_proto(struct net net)
	308	{
	309	return &net->ct.nf_ct_proto.udp.pn;
	310	}
	311
61075af5	312	struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
9fb9cbb1 YK	313	{
9fb9cbb1 YK	314	.l3proto = PF_INET,
605dcad6	315	.l4proto = IPPROTO_UDP,
9fb9cbb1	316	.name = "udp",
71d8c47f	317	.allow_clash = true,
9fb9cbb1 YK	318	.pkt_to_tuple = udp_pkt_to_tuple,
	319	.invert_tuple = udp_invert_tuple,
	320	.print_tuple = udp_print_tuple,
9fb9cbb1	321	.packet = udp_packet,
2c8503f5	322	.get_timeouts = udp_get_timeouts,
9fb9cbb1	323	.new = udp_new,
96f6bf82	324	.error = udp_error,
c0cd1156	325	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
fdf70832 PM	326	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
fdf70832 PM	327	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
a400c30e	328	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
f73e924c	329	.nla_policy = nf_ct_port_nla_policy,
c1d10adb	330	#endif
50978462 PNA	331	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	332	.ctnl_timeout = {
	333	.nlattr_to_obj = udp_timeout_nlattr_to_obj,
	334	.obj_to_nlattr = udp_timeout_obj_to_nlattr,
	335	.nlattr_max = CTA_TIMEOUT_UDP_MAX,
	336	.obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
	337	.nla_policy = udp_timeout_nla_policy,
	338	},
	339	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
dee7364e	340	.init_net = udp_init_net,
08911475	341	.get_net_proto = udp_get_net_proto,
9fb9cbb1	342	};
13b18339	343	EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);
9fb9cbb1	344
e4781421 FW	345	#ifdef CONFIG_NF_CT_PROTO_UDPLITE
	346	struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
	347	{
	348	.l3proto = PF_INET,
	349	.l4proto = IPPROTO_UDPLITE,
	350	.name = "udplite",
	351	.allow_clash = true,
	352	.pkt_to_tuple = udp_pkt_to_tuple,
	353	.invert_tuple = udp_invert_tuple,
	354	.print_tuple = udp_print_tuple,
	355	.packet = udp_packet,
	356	.get_timeouts = udp_get_timeouts,
	357	.new = udp_new,
	358	.error = udplite_error,
	359	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	360	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
	361	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
	362	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
	363	.nla_policy = nf_ct_port_nla_policy,
	364	#endif
	365	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	366	.ctnl_timeout = {
	367	.nlattr_to_obj = udp_timeout_nlattr_to_obj,
	368	.obj_to_nlattr = udp_timeout_obj_to_nlattr,
	369	.nlattr_max = CTA_TIMEOUT_UDP_MAX,
	370	.obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
	371	.nla_policy = udp_timeout_nla_policy,
	372	},
	373	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	374	.init_net = udp_init_net,
	375	.get_net_proto = udp_get_net_proto,
	376	};
	377	EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite4);
	378	#endif
	379
61075af5	380	struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
9fb9cbb1 YK	381	{
9fb9cbb1 YK	382	.l3proto = PF_INET6,
605dcad6	383	.l4proto = IPPROTO_UDP,
9fb9cbb1	384	.name = "udp",
71d8c47f	385	.allow_clash = true,
9fb9cbb1 YK	386	.pkt_to_tuple = udp_pkt_to_tuple,
	387	.invert_tuple = udp_invert_tuple,
	388	.print_tuple = udp_print_tuple,
9fb9cbb1	389	.packet = udp_packet,
2c8503f5	390	.get_timeouts = udp_get_timeouts,
9fb9cbb1	391	.new = udp_new,
96f6bf82	392	.error = udp_error,
c0cd1156	393	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
fdf70832 PM	394	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
fdf70832 PM	395	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
a400c30e	396	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
f73e924c	397	.nla_policy = nf_ct_port_nla_policy,
c1d10adb	398	#endif
50978462 PNA	399	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	400	.ctnl_timeout = {
	401	.nlattr_to_obj = udp_timeout_nlattr_to_obj,
	402	.obj_to_nlattr = udp_timeout_obj_to_nlattr,
	403	.nlattr_max = CTA_TIMEOUT_UDP_MAX,
	404	.obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
	405	.nla_policy = udp_timeout_nla_policy,
	406	},
	407	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
dee7364e	408	.init_net = udp_init_net,
08911475	409	.get_net_proto = udp_get_net_proto,
9fb9cbb1	410	};
13b18339	411	EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);
e4781421 FW	412
	413	#ifdef CONFIG_NF_CT_PROTO_UDPLITE
	414	struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
	415	{
	416	.l3proto = PF_INET6,
	417	.l4proto = IPPROTO_UDPLITE,
	418	.name = "udplite",
	419	.allow_clash = true,
	420	.pkt_to_tuple = udp_pkt_to_tuple,
	421	.invert_tuple = udp_invert_tuple,
	422	.print_tuple = udp_print_tuple,
	423	.packet = udp_packet,
	424	.get_timeouts = udp_get_timeouts,
	425	.new = udp_new,
	426	.error = udplite_error,
	427	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	428	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
	429	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
	430	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
	431	.nla_policy = nf_ct_port_nla_policy,
	432	#endif
	433	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	434	.ctnl_timeout = {
	435	.nlattr_to_obj = udp_timeout_nlattr_to_obj,
	436	.obj_to_nlattr = udp_timeout_obj_to_nlattr,
	437	.nlattr_max = CTA_TIMEOUT_UDP_MAX,
	438	.obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
	439	.nla_policy = udp_timeout_nla_policy,
	440	},
	441	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	442	.init_net = udp_init_net,
	443	.get_net_proto = udp_get_net_proto,
	444	};
	445	EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite6);
	446	#endif