linux/include/net/netfilter/nf_conntrack_tuple.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Definitions and Declarations for tuple.
 *
 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <[email protected]>
 *	- generalize L3 protocol dependent part.
 *
 * Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h
 */

#ifndef _NF_CONNTRACK_TUPLE_H
#define _NF_CONNTRACK_TUPLE_H

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <linux/list_nulls.h>

/* A `tuple' is a structure containing the information to uniquely
  identify a connection.  ie. if two packets have the same tuple, they
  are in the same connection; if not, they are not.

  We divide the structure along "manipulatable" and
  "non-manipulatable" lines, for the benefit of the NAT code.
*/

#define NF_CT_TUPLE_L3SIZE …

/* The manipulable part of the tuple. */
struct nf_conntrack_man { … };

/* This contains the information to distinguish a connection. */
struct nf_conntrack_tuple { … };

struct nf_conntrack_tuple_mask { … };

static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
{ … }

static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
{ … }

static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
{ … }

/* If we're the first tuple, it's the original dir. */
#define NF_CT_DIRECTION(h) …

/* Connections have two entries in the hash table: one for each way */
struct nf_conntrack_tuple_hash { … };

static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
					   const struct nf_conntrack_tuple *t2)
{ … }

static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
					   const struct nf_conntrack_tuple *t2)
{ … }

static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
				     const struct nf_conntrack_tuple *t2)
{ … }

static inline bool
nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
		       const struct nf_conntrack_tuple_mask *m2)
{ … }

static inline bool
nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
			 const struct nf_conntrack_tuple *t2,
			 const struct nf_conntrack_tuple_mask *mask)
{ … }

static inline bool
nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
		     const struct nf_conntrack_tuple *tuple,
		     const struct nf_conntrack_tuple_mask *mask)
{ … }

#endif /* _NF_CONNTRACK_TUPLE_H */