patch-2.3.99-pre2 linux/include/linux/netfilter_ipv4/ip_nat.h

• Lines: 118
• Date: Fri Mar 17 10:56:20 2000
• Orig file: v2.3.99-pre1/linux/include/linux/netfilter_ipv4/ip_nat.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre1/linux/include/linux/netfilter_ipv4/ip_nat.h linux/include/linux/netfilter_ipv4/ip_nat.h
@@ -0,0 +1,117 @@
+#ifndef _IP_NAT_H
+#define _IP_NAT_H
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
+
+#define IP_NAT_MAPPING_TYPE_MAX_NAMELEN 16
+
+enum ip_nat_manip_type
+{
+	IP_NAT_MANIP_SRC,
+	IP_NAT_MANIP_DST
+};
+
+/* SRC manip occurs only on POST_ROUTING */
+#define HOOK2MANIP(hooknum) ((hooknum) != NF_IP_POST_ROUTING)
+
+/* 2.3.19 (I hope) will define this in linux/netfilter_ipv4.h. */
+#ifndef SO_ORIGINAL_DST
+#define SO_ORIGINAL_DST 80
+#endif
+
+#define IP_NAT_RANGE_MAP_IPS 1
+#define IP_NAT_RANGE_PROTO_SPECIFIED 2
+/* Used internally by get_unique_tuple(). */
+#define IP_NAT_RANGE_FULL 4
+
+/* Single range specification. */
+struct ip_nat_range
+{
+	/* Set to OR of flags above. */
+	unsigned int flags;
+
+	/* Inclusive: network order. */
+	u_int32_t min_ip, max_ip;
+
+	/* Inclusive: network order */
+	union ip_conntrack_manip_proto min, max;
+};
+
+/* A range consists of an array of 1 or more ip_nat_range */
+struct ip_nat_multi_range
+{
+	unsigned int rangesize;
+
+	/* hangs off end. */
+	struct ip_nat_range range[1];
+};
+
+#ifdef __KERNEL__
+#include <linux/list.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+
+/* Protects NAT hash tables, and NAT-private part of conntracks. */
+DECLARE_RWLOCK_EXTERN(ip_nat_lock);
+
+/* Hashes for by-source and IP/protocol. */
+struct ip_nat_hash
+{
+	struct list_head list;
+
+	/* conntrack we're embedded in: NULL if not in hash. */
+	struct ip_conntrack *conntrack;
+};
+
+/* Worst case: local-out manip + 1 post-routing, and reverse dirn. */
+#define IP_NAT_MAX_MANIPS (2*3)
+
+struct ip_nat_info_manip
+{
+	/* The direction. */
+	u_int8_t direction;
+
+	/* Which hook the manipulation happens on. */
+	u_int8_t hooknum;
+
+	/* The manipulation type. */
+	u_int8_t maniptype;
+
+	/* Manipulations to occur at each conntrack in this dirn. */
+	struct ip_conntrack_manip manip;
+};
+	
+/* The structure embedded in the conntrack structure. */
+struct ip_nat_info
+{
+	/* Set to zero when conntrack created: bitmask of maniptypes */
+	int initialized;
+
+	unsigned int num_manips;
+
+	/* Manipulations to be done on this conntrack. */
+	struct ip_nat_info_manip manips[IP_NAT_MAX_MANIPS];
+
+	/* The mapping type which created us (NULL for null mapping). */
+	const struct ip_nat_mapping_type *mtype;
+
+	struct ip_nat_hash bysource, byipsproto;
+
+	/* Helper (NULL if none). */
+	struct ip_nat_helper *helper;
+};
+
+/* Set up the info structure to map into this range. */
+extern unsigned int ip_nat_setup_info(struct ip_conntrack *conntrack,
+				      const struct ip_nat_multi_range *mr,
+				      unsigned int hooknum);
+
+/* Is this tuple already taken? (not by us)*/
+extern int ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
+			     const struct ip_conntrack *ignored_conntrack);
+
+/* Calculate relative checksum. */
+extern u_int16_t ip_nat_cheat_check(u_int32_t oldvalinv,
+				    u_int32_t newval,
+				    u_int16_t oldcheck);
+#endif /*__KERNEL__*/
+#endif