1 #ifndef _NF_NAT_H
2 #define _NF_NAT_H
3 #include <linux/netfilter_ipv4.h>
4 #include <net/netfilter/nf_conntrack_tuple.h>
5
6 #define NF_NAT_MAPPING_TYPE_MAX_NAMELEN 16
7
8 enum nf_nat_manip_type
9 {
10 IP_NAT_MANIP_SRC,
11 IP_NAT_MANIP_DST
12 };
13
14 /* SRC manip occurs POST_ROUTING or LOCAL_IN */
15 #define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
16 (hooknum) != NF_INET_LOCAL_IN)
17
18 #define IP_NAT_RANGE_MAP_IPS 1
19 #define IP_NAT_RANGE_PROTO_SPECIFIED 2
20 #define IP_NAT_RANGE_PROTO_RANDOM 4
21 #define IP_NAT_RANGE_PERSISTENT 8
22
23 /* NAT sequence number modifications */
24 struct nf_nat_seq {
25 /* position of the last TCP sequence number modification (if any) */
26 u_int32_t correction_pos;
27
28 /* sequence number offset before and after last modification */
29 int16_t offset_before, offset_after;
30 };
31
32 /* Single range specification. */
33 struct nf_nat_range
34 {
35 /* Set to OR of flags above. */
36 unsigned int flags;
37
38 /* Inclusive: network order. */
39 __be32 min_ip, max_ip;
40
41 /* Inclusive: network order */
42 union nf_conntrack_man_proto min, max;
43 };
44
45 /* For backwards compat: don't use in modern code. */
46 struct nf_nat_multi_range_compat
47 {
48 unsigned int rangesize; /* Must be 1. */
49
50 /* hangs off end. */
51 struct nf_nat_range range[1];
52 };
53
54 #ifdef __KERNEL__
55 #include <linux/list.h>
56 #include <linux/netfilter/nf_conntrack_pptp.h>
57 #include <net/netfilter/nf_conntrack_extend.h>
58
59 /* per conntrack: nat application helper private data */
60 union nf_conntrack_nat_help
61 {
62 /* insert nat helper private data here */
63 struct nf_nat_pptp nat_pptp_info;
64 };
65
66 struct nf_conn;
67
68 /* The structure embedded in the conntrack structure. */
69 struct nf_conn_nat
70 {
71 struct hlist_node bysource;
72 struct nf_nat_seq seq[IP_CT_DIR_MAX];
73 struct nf_conn *ct;
74 union nf_conntrack_nat_help help;
75 #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
76 defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
77 int masq_index;
78 #endif
79 };
80
81 /* Set up the info structure to map into this range. */
82 extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
83 const struct nf_nat_range *range,
84 enum nf_nat_manip_type maniptype);
85
86 /* Is this tuple already taken? (not by us)*/
87 extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
88 const struct nf_conn *ignored_conntrack);
89
90 static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
91 {
92 return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
93 }
94
95 #else /* !__KERNEL__: iptables wants this to compile. */
96 #define nf_nat_multi_range nf_nat_multi_range_compat
97 #endif /*__KERNEL__*/
98 #endif
99
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