5ee956125a
This patch reduces the size of 'struct ip_conntrack' on systems with NAT by eight bytes. The sequence number delta values can be int16_t, since we only support one sequence number modification per window anyway, and one such modification is not going to exceed 32kB ;) Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
#ifndef _IP_NAT_H
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#define _IP_NAT_H
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
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#define IP_NAT_MAPPING_TYPE_MAX_NAMELEN 16
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enum ip_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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/* NAT sequence number modifications */
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struct ip_nat_seq {
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/* position of the last TCP sequence number
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* 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 ip_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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u_int32_t min_ip, max_ip;
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/* Inclusive: network order */
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union ip_conntrack_manip_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 ip_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 ip_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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/* Protects NAT hash tables, and NAT-private part of conntracks. */
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extern rwlock_t ip_nat_lock;
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/* The structure embedded in the conntrack structure. */
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struct ip_nat_info
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{
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struct list_head bysource;
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struct ip_nat_seq seq[IP_CT_DIR_MAX];
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};
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struct ip_conntrack;
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/* Set up the info structure to map into this range. */
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extern unsigned int ip_nat_setup_info(struct ip_conntrack *conntrack,
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const struct ip_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 ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
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const struct ip_conntrack *ignored_conntrack);
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/* Calculate relative checksum. */
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extern u_int16_t ip_nat_cheat_check(u_int32_t oldvalinv,
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u_int32_t newval,
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u_int16_t oldcheck);
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#else /* !__KERNEL__: iptables wants this to compile. */
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#define ip_nat_multi_range ip_nat_multi_range_compat
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#endif /*__KERNEL__*/
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#endif
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