1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Header for use in defining a given protocol. */ 3 #ifndef _NF_NAT_L4PROTO_H 4 #define _NF_NAT_L4PROTO_H 5 #include <net/netfilter/nf_nat.h> 6 #include <linux/netfilter/nfnetlink_conntrack.h> 7 8 struct nf_nat_range; 9 struct nf_nat_l3proto; 10 11 struct nf_nat_l4proto { 12 /* Protocol number. */ 13 u8 l4proto; 14 15 /* Translate a packet to the target according to manip type. 16 * Return true if succeeded. 17 */ 18 bool (*manip_pkt)(struct sk_buff *skb, 19 const struct nf_nat_l3proto *l3proto, 20 unsigned int iphdroff, unsigned int hdroff, 21 const struct nf_conntrack_tuple *tuple, 22 enum nf_nat_manip_type maniptype); 23 24 /* Is the manipable part of the tuple between min and max incl? */ 25 bool (*in_range)(const struct nf_conntrack_tuple *tuple, 26 enum nf_nat_manip_type maniptype, 27 const union nf_conntrack_man_proto *min, 28 const union nf_conntrack_man_proto *max); 29 30 /* Alter the per-proto part of the tuple (depending on 31 * maniptype), to give a unique tuple in the given range if 32 * possible. Per-protocol part of tuple is initialized to the 33 * incoming packet. 34 */ 35 void (*unique_tuple)(const struct nf_nat_l3proto *l3proto, 36 struct nf_conntrack_tuple *tuple, 37 const struct nf_nat_range2 *range, 38 enum nf_nat_manip_type maniptype, 39 const struct nf_conn *ct); 40 41 int (*nlattr_to_range)(struct nlattr *tb[], 42 struct nf_nat_range2 *range); 43 }; 44 45 /* Protocol registration. */ 46 int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto); 47 void nf_nat_l4proto_unregister(u8 l3proto, 48 const struct nf_nat_l4proto *l4proto); 49 50 const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto); 51 52 /* Built-in protocols. */ 53 extern const struct nf_nat_l4proto nf_nat_l4proto_tcp; 54 extern const struct nf_nat_l4proto nf_nat_l4proto_udp; 55 extern const struct nf_nat_l4proto nf_nat_l4proto_icmp; 56 extern const struct nf_nat_l4proto nf_nat_l4proto_icmpv6; 57 extern const struct nf_nat_l4proto nf_nat_l4proto_unknown; 58 #ifdef CONFIG_NF_NAT_PROTO_DCCP 59 extern const struct nf_nat_l4proto nf_nat_l4proto_dccp; 60 #endif 61 #ifdef CONFIG_NF_NAT_PROTO_SCTP 62 extern const struct nf_nat_l4proto nf_nat_l4proto_sctp; 63 #endif 64 #ifdef CONFIG_NF_NAT_PROTO_UDPLITE 65 extern const struct nf_nat_l4proto nf_nat_l4proto_udplite; 66 #endif 67 68 bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple, 69 enum nf_nat_manip_type maniptype, 70 const union nf_conntrack_man_proto *min, 71 const union nf_conntrack_man_proto *max); 72 73 void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto, 74 struct nf_conntrack_tuple *tuple, 75 const struct nf_nat_range2 *range, 76 enum nf_nat_manip_type maniptype, 77 const struct nf_conn *ct); 78 79 int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[], 80 struct nf_nat_range2 *range); 81 82 #endif /*_NF_NAT_L4PROTO_H*/ 83