include/net/netfilter/nf_nat.h

Source file repositories/reference/linux-study-clean/include/net/netfilter/nf_nat.h

File Facts

System
Linux kernel
Corpus path
include/net/netfilter/nf_nat.h
Extension
.h
Size
3864 bytes
Lines
120
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct nf_conn_nat {
	union nf_conntrack_nat_help help;
#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
	int masq_index;
#endif
};

/* 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)
{
#if IS_ENABLED(CONFIG_NF_NAT)
	return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
#else
	return NULL;
#endif
}

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)
{
#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE)
	return nat && nat->masq_index && hooknum == NF_INET_POST_ROUTING &&
	       CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL &&
	       nat->masq_index != out->ifindex;
#else
	return false;
#endif
}

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)
{
	if (manip == NF_NAT_MANIP_SRC)
		return ct->status & IPS_SRC_NAT_DONE;
	else
		return ct->status & IPS_DST_NAT_DONE;
}
#endif

Annotation

Implementation Notes