LXR linux/include/net/netfilter/nf_nat

   1/* Header for use in defining a given protocol. */
   2#ifndef _NF_NAT_L4PROTO_H
   3#define _NF_NAT_L4PROTO_H
   4#include <net/netfilter/nf_nat.h>
   5#include <linux/netfilter/nfnetlink_conntrack.h>
   6
   7struct nf_nat_range;
   8struct nf_nat_l3proto;
   9
  10struct nf_nat_l4proto {
  11        /* Protocol number. */
  12        u8 l4proto;
  13
  14        /* Translate a packet to the target according to manip type.
  15         * Return true if succeeded.
  16         */
  17        bool (*manip_pkt)(struct sk_buff *skb,
  18                          const struct nf_nat_l3proto *l3proto,
  19                          unsigned int iphdroff, unsigned int hdroff,
  20                          const struct nf_conntrack_tuple *tuple,
  21                          enum nf_nat_manip_type maniptype);
  22
  23        /* Is the manipable part of the tuple between min and max incl? */
  24        bool (*in_range)(const struct nf_conntrack_tuple *tuple,
  25                         enum nf_nat_manip_type maniptype,
  26                         const union nf_conntrack_man_proto *min,
  27                         const union nf_conntrack_man_proto *max);
  28
  29        /* Alter the per-proto part of the tuple (depending on
  30         * maniptype), to give a unique tuple in the given range if
  31         * possible.  Per-protocol part of tuple is initialized to the
  32         * incoming packet.
  33         */
  34        void (*unique_tuple)(const struct nf_nat_l3proto *l3proto,
  35                             struct nf_conntrack_tuple *tuple,
  36                             const struct nf_nat_range *range,
  37                             enum nf_nat_manip_type maniptype,
  38                             const struct nf_conn *ct);
  39
  40        int (*nlattr_to_range)(struct nlattr *tb[],
  41                               struct nf_nat_range *range);
  42};
  43
  44/* Protocol registration. */
  45extern int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto);
  46extern void nf_nat_l4proto_unregister(u8 l3proto, const struct nf_nat_l4proto *l4proto);
  47
  48extern const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto);
  49
  50/* Built-in protocols. */
  51extern const struct nf_nat_l4proto nf_nat_l4proto_tcp;
  52extern const struct nf_nat_l4proto nf_nat_l4proto_udp;
  53extern const struct nf_nat_l4proto nf_nat_l4proto_icmp;
  54extern const struct nf_nat_l4proto nf_nat_l4proto_icmpv6;
  55extern const struct nf_nat_l4proto nf_nat_l4proto_unknown;
  56
  57extern bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
  58                                    enum nf_nat_manip_type maniptype,
  59                                    const union nf_conntrack_man_proto *min,
  60                                    const union nf_conntrack_man_proto *max);
  61
  62extern void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
  63                                        struct nf_conntrack_tuple *tuple,
  64                                        const struct nf_nat_range *range,
  65                                        enum nf_nat_manip_type maniptype,
  66                                        const struct nf_conn *ct,
  67                                        u16 *rover);
  68
  69extern int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
  70                                          struct nf_nat_range *range);
  71
  72#endif /*_NF_NAT_L4PROTO_H*/
  73