linux/include/net/netfilter/nf_conntrack_core.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * This header is used to share core functionality between the
 * standalone connection tracking module, and the compatibility layer's use
 * of connection tracking.
 *
 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <[email protected]>
 *	- generalize L3 protocol dependent part.
 *
 * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
 */

#ifndef _NF_CONNTRACK_CORE_H
#define _NF_CONNTRACK_CORE_H

#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_l4proto.h>

/* This header is used to share core functionality between the
   standalone connection tracking module, and the compatibility layer's use
   of connection tracking. */

unsigned int nf_conntrack_in(struct sk_buff *skb,
			     const struct nf_hook_state *state);

int nf_conntrack_init_net(struct net *net);
void nf_conntrack_cleanup_net(struct net *net);
void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);

void nf_conntrack_proto_pernet_init(struct net *net);

int nf_conntrack_proto_init(void);
void nf_conntrack_proto_fini(void);

int nf_conntrack_init_start(void);
void nf_conntrack_cleanup_start(void);

void nf_conntrack_init_end(void);
void nf_conntrack_cleanup_end(void);

bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
			const struct nf_conntrack_tuple *orig);

/* Find a connection corresponding to a tuple. */
struct nf_conntrack_tuple_hash *
nf_conntrack_find_get(struct net *net,
		      const struct nf_conntrack_zone *zone,
		      const struct nf_conntrack_tuple *tuple);

int __nf_conntrack_confirm(struct sk_buff *skb);

/* Confirm a connection: returns NF_DROP if packet must be dropped. */
static inline int nf_conntrack_confirm(struct sk_buff *skb)
{ … }

unsigned int nf_confirm(void *priv, struct sk_buff *skb, const struct nf_hook_state *state);

void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
		 const struct nf_conntrack_l4proto *proto);

#define CONNTRACK_LOCKS …

extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
void nf_conntrack_lock(spinlock_t *lock);

extern spinlock_t nf_conntrack_expect_lock;

/* ctnetlink code shared by both ctnetlink and nf_conntrack_bpf */

static inline void __nf_ct_set_timeout(struct nf_conn *ct, u64 timeout)
{ … }

int __nf_ct_change_timeout(struct nf_conn *ct, u64 cta_timeout);
void __nf_ct_change_status(struct nf_conn *ct, unsigned long on, unsigned long off);
int nf_ct_change_status_common(struct nf_conn *ct, unsigned int status);

#endif /* _NF_CONNTRACK_CORE_H */