2006-12-03 06:07:13 +00:00
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#ifndef _NF_NAT_H
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#define _NF_NAT_H
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#include <linux/netfilter_ipv4.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#define NF_NAT_MAPPING_TYPE_MAX_NAMELEN 16
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enum nf_nat_manip_type
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{
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IP_NAT_MANIP_SRC,
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IP_NAT_MANIP_DST
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};
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/* SRC manip occurs POST_ROUTING or LOCAL_IN */
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#define HOOK2MANIP(hooknum) ((hooknum) != NF_IP_POST_ROUTING && (hooknum) != NF_IP_LOCAL_IN)
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#define IP_NAT_RANGE_MAP_IPS 1
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#define IP_NAT_RANGE_PROTO_SPECIFIED 2
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2007-02-07 23:10:09 +00:00
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#define IP_NAT_RANGE_PROTO_RANDOM 4
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2006-12-03 06:07:13 +00:00
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/* NAT sequence number modifications */
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struct nf_nat_seq {
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/* position of the last TCP sequence number modification (if any) */
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u_int32_t correction_pos;
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/* sequence number offset before and after last modification */
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int16_t offset_before, offset_after;
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};
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/* Single range specification. */
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struct nf_nat_range
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{
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/* Set to OR of flags above. */
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unsigned int flags;
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/* Inclusive: network order. */
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__be32 min_ip, max_ip;
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/* Inclusive: network order */
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union nf_conntrack_man_proto min, max;
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};
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/* For backwards compat: don't use in modern code. */
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struct nf_nat_multi_range_compat
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{
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unsigned int rangesize; /* Must be 1. */
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/* hangs off end. */
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struct nf_nat_range range[1];
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};
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#ifdef __KERNEL__
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#include <linux/list.h>
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/* The structure embedded in the conntrack structure. */
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struct nf_nat_info
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{
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struct list_head bysource;
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struct nf_nat_seq seq[IP_CT_DIR_MAX];
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};
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struct nf_conn;
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/* Set up the info structure to map into this range. */
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extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
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const struct nf_nat_range *range,
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unsigned int hooknum);
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/* Is this tuple already taken? (not by us)*/
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extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
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const struct nf_conn *ignored_conntrack);
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extern int nf_nat_module_is_loaded;
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#else /* !__KERNEL__: iptables wants this to compile. */
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#define nf_nat_multi_range nf_nat_multi_range_compat
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#endif /*__KERNEL__*/
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#endif
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