nf_nat.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NF_NAT_H
#define _NF_NAT_H

#include <linux/list.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/nf_conntrack_pptp.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <uapi/linux/netfilter/nf_nat.h>

enum nf_nat_manip_type { … };

/* SRC manip occurs POST_ROUTING or LOCAL_IN */
#define HOOK2MANIP(hooknum) …

/* per conntrack: nat application helper private data */
nf_conntrack_nat_help;

/* The structure embedded in the conntrack structure. */
struct nf_conn_nat { … };

/* Set up the info structure to map into this range. */
unsigned int nf_nat_setup_info(struct nf_conn *ct,
			       const struct nf_nat_range2 *range,
			       enum nf_nat_manip_type maniptype);

extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
					      unsigned int hooknum);

struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct);

static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
{ … }

static inline bool nf_nat_oif_changed(unsigned int hooknum,
				      enum ip_conntrack_info ctinfo,
				      struct nf_conn_nat *nat,
				      const struct net_device *out)
{ … }

int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
		       const struct nf_hook_ops *nat_ops, unsigned int ops_count);
void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
			  unsigned int ops_count);

unsigned int nf_nat_packet(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
			   unsigned int hooknum, struct sk_buff *skb);

unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
			      enum nf_nat_manip_type mtype,
			      enum ip_conntrack_dir dir);
void nf_nat_csum_recalc(struct sk_buff *skb,
			u8 nfproto, u8 proto, void *data, __sum16 *check,
			int datalen, int oldlen);

int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
				  enum ip_conntrack_info ctinfo,
				  unsigned int hooknum);

int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
				    enum ip_conntrack_info ctinfo,
				    unsigned int hooknum, unsigned int hdrlen);

int nf_nat_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops);
void nf_nat_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops);

int nf_nat_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops);
void nf_nat_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops);

int nf_nat_inet_register_fn(struct net *net, const struct nf_hook_ops *ops);
void nf_nat_inet_unregister_fn(struct net *net, const struct nf_hook_ops *ops);

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

int nf_ct_nat(struct sk_buff *skb, struct nf_conn *ct,
	      enum ip_conntrack_info ctinfo, int *action,
	      const struct nf_nat_range2 *range, bool commit);

static inline int nf_nat_initialized(const struct nf_conn *ct,
				     enum nf_nat_manip_type manip)
{ … }
#endif
linux/include/net/netfilter/nf_nat.h
