Linux Kernel  3.7.1
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nf_nat.h
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1 #ifndef _NF_NAT_H
2 #define _NF_NAT_H
3 #include <linux/netfilter_ipv4.h>
6 
10 };
11 
12 /* SRC manip occurs POST_ROUTING or LOCAL_IN */
13 #define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
14  (hooknum) != NF_INET_LOCAL_IN)
15 
16 /* NAT sequence number modifications */
17 struct nf_nat_seq {
18  /* position of the last TCP sequence number modification (if any) */
20 
21  /* sequence number offset before and after last modification */
23 };
24 
25 #include <linux/list.h>
28 
29 /* per conntrack: nat application helper private data */
31  /* insert nat helper private data here */
32 #if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE)
33  struct nf_nat_pptp nat_pptp_info;
34 #endif
35 };
36 
37 struct nf_conn;
38 
39 /* The structure embedded in the conntrack structure. */
40 struct nf_conn_nat {
43  struct nf_conn *ct;
45 #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
46  defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE) || \
47  defined(CONFIG_IP6_NF_TARGET_MASQUERADE) || \
48  defined(CONFIG_IP6_NF_TARGET_MASQUERADE_MODULE)
49  int masq_index;
50 #endif
51 };
52 
53 /* Set up the info structure to map into this range. */
54 extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
55  const struct nf_nat_range *range,
56  enum nf_nat_manip_type maniptype);
57 
58 /* Is this tuple already taken? (not by us)*/
59 extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
60  const struct nf_conn *ignored_conntrack);
61 
62 static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
63 {
64 #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
65  return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
66 #else
67  return NULL;
68 #endif
69 }
70 
71 #endif