linux/net/netfilter/nf_conntrack_proto_udp.c

// SPDX-License-Identifier: GPL-2.0-only
/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <[email protected]>
 * (C) 2006-2012 Patrick McHardy <[email protected]>
 */

#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] = …;

static unsigned int *udp_get_timeouts(struct net *net)
{ … }

static void udp_error_log(const struct sk_buff *skb,
			  const struct nf_hook_state *state,
			  const char *msg)
{ … }

static bool udp_error(struct sk_buff *skb,
		      unsigned int dataoff,
		      const struct nf_hook_state *state)
{ … }

/* 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)
{ … }

#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)
{ … }

static bool udplite_error(struct sk_buff *skb,
			  unsigned int dataoff,
			  const struct nf_hook_state *state)
{ … }

/* 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)
{ … }
#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)
{ … }

static int
udp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
{ … }

static const struct nla_policy
udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = …;
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */

void nf_conntrack_udp_init_net(struct net *net)
{ … }

const struct nf_conntrack_l4proto nf_conntrack_l4proto_udp = …;

#ifdef CONFIG_NF_CT_PROTO_UDPLITE
const struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite = …;
#endif