3 #include <linux/netfilter_ipv4.h>
4 #include <linux/netfilter/nf_nat.h>
5 #include <net/netfilter/nf_conntrack_tuple.h>
7 enum nf_nat_manip_type
{
12 /* SRC manip occurs POST_ROUTING or LOCAL_IN */
13 #define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
14 (hooknum) != NF_INET_LOCAL_IN)
16 #include <linux/list.h>
17 #include <linux/netfilter/nf_conntrack_pptp.h>
18 #include <net/netfilter/nf_conntrack_extend.h>
20 /* per conntrack: nat application helper private data */
21 union nf_conntrack_nat_help
{
22 /* insert nat helper private data here */
23 #if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE)
24 struct nf_nat_pptp nat_pptp_info
;
30 /* The structure embedded in the conntrack structure. */
32 struct hlist_node bysource
;
34 union nf_conntrack_nat_help help
;
35 #if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV4) || \
36 IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV6)
41 /* Set up the info structure to map into this range. */
42 unsigned int nf_nat_setup_info(struct nf_conn
*ct
,
43 const struct nf_nat_range
*range
,
44 enum nf_nat_manip_type maniptype
);
46 extern unsigned int nf_nat_alloc_null_binding(struct nf_conn
*ct
,
47 unsigned int hooknum
);
49 struct nf_conn_nat
*nf_ct_nat_ext_add(struct nf_conn
*ct
);
51 /* Is this tuple already taken? (not by us)*/
52 int nf_nat_used_tuple(const struct nf_conntrack_tuple
*tuple
,
53 const struct nf_conn
*ignored_conntrack
);
55 static inline struct nf_conn_nat
*nfct_nat(const struct nf_conn
*ct
)
57 #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
58 return nf_ct_ext_find(ct
, NF_CT_EXT_NAT
);
64 static inline bool nf_nat_oif_changed(unsigned int hooknum
,
65 enum ip_conntrack_info ctinfo
,
66 struct nf_conn_nat
*nat
,
67 const struct net_device
*out
)
69 #if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV4) || \
70 IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV6)
71 return nat
->masq_index
&& hooknum
== NF_INET_POST_ROUTING
&&
72 CTINFO2DIR(ctinfo
) == IP_CT_DIR_ORIGINAL
&&
73 nat
->masq_index
!= out
->ifindex
;