1 /* Header for use in defining a given protocol. */ 2 #ifndef _NF_NAT_PROTOCOL_H 3 #define _NF_NAT_PROTOCOL_H 4 #include <net/netfilter/nf_nat.h> 5 #include <linux/netfilter/nfnetlink_conntrack.h> 6 7 struct nf_nat_ipv4_range; 8 9 struct nf_nat_protocol { 10 /* Protocol number. */ 11 unsigned int protonum; 12 13 /* Translate a packet to the target according to manip type. 14 Return true if succeeded. */ 15 bool (*manip_pkt)(struct sk_buff *skb, 16 unsigned int iphdroff, 17 const struct nf_conntrack_tuple *tuple, 18 enum nf_nat_manip_type maniptype); 19 20 /* Is the manipable part of the tuple between min and max incl? */ 21 bool (*in_range)(const struct nf_conntrack_tuple *tuple, 22 enum nf_nat_manip_type maniptype, 23 const union nf_conntrack_man_proto *min, 24 const union nf_conntrack_man_proto *max); 25 26 /* Alter the per-proto part of the tuple (depending on 27 maniptype), to give a unique tuple in the given range if 28 possible. Per-protocol part of tuple is initialized to the 29 incoming packet. */ 30 void (*unique_tuple)(struct nf_conntrack_tuple *tuple, 31 const struct nf_nat_ipv4_range *range, 32 enum nf_nat_manip_type maniptype, 33 const struct nf_conn *ct); 34 35 int (*nlattr_to_range)(struct nlattr *tb[], 36 struct nf_nat_ipv4_range *range); 37 }; 38 39 /* Protocol registration. */ 40 extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto); 41 extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto); 42 43 /* Built-in protocols. */ 44 extern const struct nf_nat_protocol nf_nat_protocol_tcp; 45 extern const struct nf_nat_protocol nf_nat_protocol_udp; 46 extern const struct nf_nat_protocol nf_nat_protocol_icmp; 47 extern const struct nf_nat_protocol nf_nat_unknown_protocol; 48 49 extern int init_protocols(void) __init; 50 extern void cleanup_protocols(void); 51 extern const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum); 52 53 extern bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple, 54 enum nf_nat_manip_type maniptype, 55 const union nf_conntrack_man_proto *min, 56 const union nf_conntrack_man_proto *max); 57 58 extern void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple, 59 const struct nf_nat_ipv4_range *range, 60 enum nf_nat_manip_type maniptype, 61 const struct nf_conn *ct, 62 u_int16_t *rover); 63 64 extern int nf_nat_proto_nlattr_to_range(struct nlattr *tb[], 65 struct nf_nat_ipv4_range *range); 66 67 #endif /*_NF_NAT_PROTO_H*/ 68