nf_nat_l3proto.h

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#ifndef _NF_NAT_L3PROTO_H
#define _NF_NAT_L3PROTO_H

struct nf_nat_l4proto;
struct nf_nat_l3proto {
    u8  l3proto;

    bool    (*in_range)(const struct nf_conntrack_tuple *t,
                const struct nf_nat_range *range);

    u32     (*secure_port)(const struct nf_conntrack_tuple *t, __be16);

    bool    (*manip_pkt)(struct sk_buff *skb,
                 unsigned int iphdroff,
                 const struct nf_nat_l4proto *l4proto,
                 const struct nf_conntrack_tuple *target,
                 enum nf_nat_manip_type maniptype);

    void    (*csum_update)(struct sk_buff *skb, unsigned int iphdroff,
                   __sum16 *check,
                   const struct nf_conntrack_tuple *t,
                   enum nf_nat_manip_type maniptype);

    void    (*csum_recalc)(struct sk_buff *skb, u8 proto,
                   void *data, __sum16 *check,
                   int datalen, int oldlen);

    void    (*decode_session)(struct sk_buff *skb,
                  const struct nf_conn *ct,
                  enum ip_conntrack_dir dir,
                  unsigned long statusbit,
                  struct flowi *fl);

    int (*nlattr_to_range)(struct nlattr *tb[],
                   struct nf_nat_range *range);
};

extern int nf_nat_l3proto_register(const struct nf_nat_l3proto *);
extern void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *);
extern const struct nf_nat_l3proto *__nf_nat_l3proto_find(u8 l3proto);

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

#endif /* _NF_NAT_L3PROTO_H */