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