--- /dev/null
+/*
+ * 25-Jul-1998 Major changes to allow for ip chain table
+ *
+ * 3-Jan-2000 Named tables to allow packet selection for different uses.
+ */
+
+/*
+ * Format of an IP firewall descriptor
+ *
+ * src, dst, src_mask, dst_mask are always stored in network byte order.
+ * flags are stored in host byte order (of course).
+ * Port numbers are stored in HOST byte order.
+ */
+
+#ifndef _IPTABLES_H
+#define _IPTABLES_H
+
+#include <linux/compiler.h>
+#include <linux/netfilter_ipv4.h>
+
+#define IPT_FUNCTION_MAXNAMELEN 30
+#define IPT_TABLE_MAXNAMELEN 32
+
+/* Yes, Virginia, you have to zero the padding. */
+struct ipt_ip {
+ /* Source and destination IP addr */
+ struct in_addr src, dst;
+ /* Mask for src and dest IP addr */
+ struct in_addr smsk, dmsk;
+ char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
+ unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
+
+ /* Protocol, 0 = ANY */
+ u_int16_t proto;
+
+ /* Flags word */
+ u_int8_t flags;
+ /* Inverse flags */
+ u_int8_t invflags;
+};
+
+struct ipt_entry_match
+{
+ union {
+ struct {
+ u_int16_t match_size;
+
+ /* Used by userspace */
+ char name[IPT_FUNCTION_MAXNAMELEN-1];
+
+ u_int8_t revision;
+ } user;
+ struct {
+ u_int16_t match_size;
+
+ /* Used inside the kernel */
+ struct ipt_match *match;
+ } kernel;
+
+ /* Total length */
+ u_int16_t match_size;
+ } u;
+
+ unsigned char data[0];
+};
+
+struct ipt_entry_target
+{
+ union {
+ struct {
+ u_int16_t target_size;
+
+ /* Used by userspace */
+ char name[IPT_FUNCTION_MAXNAMELEN-1];
+
+ u_int8_t revision;
+ } user;
+ struct {
+ u_int16_t target_size;
+
+ /* Used inside the kernel */
+ struct ipt_target *target;
+ } kernel;
+
+ /* Total length */
+ u_int16_t target_size;
+ } u;
+
+ unsigned char data[0];
+};
+
+struct ipt_standard_target
+{
+ struct ipt_entry_target target;
+ int verdict;
+};
+
+struct ipt_counters
+{
+ u_int64_t pcnt, bcnt; /* Packet and byte counters */
+};
+
+/* Values for "flag" field in struct ipt_ip (general ip structure). */
+#define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
+#define IPT_F_MASK 0x01 /* All possible flag bits mask. */
+
+/* Values for "inv" field in struct ipt_ip. */
+#define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
+#define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
+#define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
+#define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
+#define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
+#define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
+#define IPT_INV_PROTO 0x40 /* Invert the sense of PROTO. */
+#define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
+
+/* This structure defines each of the firewall rules. Consists of 3
+ parts which are 1) general IP header stuff 2) match specific
+ stuff 3) the target to perform if the rule matches */
+struct ipt_entry
+{
+ struct ipt_ip ip;
+
+ /* Mark with fields that we care about. */
+ unsigned int nfcache;
+
+ /* Size of ipt_entry + matches */
+ u_int16_t target_offset;
+ /* Size of ipt_entry + matches + target */
+ u_int16_t next_offset;
+
+ /* Back pointer */
+ unsigned int comefrom;
+
+ /* Packet and byte counters. */
+ struct ipt_counters counters;
+
+ /* The matches (if any), then the target. */
+ unsigned char elems[0];
+};
+
+/*
+ * New IP firewall options for [gs]etsockopt at the RAW IP level.
+ * Unlike BSD Linux inherits IP options so you don't have to use a raw
+ * socket for this. Instead we check rights in the calls. */
+#define IPT_BASE_CTL 64 /* base for firewall socket options */
+
+#define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
+#define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
+#define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
+
+#define IPT_SO_GET_INFO (IPT_BASE_CTL)
+#define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
+#define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
+#define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
+#define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
+
+/* CONTINUE verdict for targets */
+#define IPT_CONTINUE 0xFFFFFFFF
+
+/* For standard target */
+#define IPT_RETURN (-NF_MAX_VERDICT - 1)
+
+/* TCP matching stuff */
+struct ipt_tcp
+{
+ u_int16_t spts[2]; /* Source port range. */
+ u_int16_t dpts[2]; /* Destination port range. */
+ u_int8_t option; /* TCP Option iff non-zero*/
+ u_int8_t flg_mask; /* TCP flags mask byte */
+ u_int8_t flg_cmp; /* TCP flags compare byte */
+ u_int8_t invflags; /* Inverse flags */
+};
+
+/* Values for "inv" field in struct ipt_tcp. */
+#define IPT_TCP_INV_SRCPT 0x01 /* Invert the sense of source ports. */
+#define IPT_TCP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */
+#define IPT_TCP_INV_FLAGS 0x04 /* Invert the sense of TCP flags. */
+#define IPT_TCP_INV_OPTION 0x08 /* Invert the sense of option test. */
+#define IPT_TCP_INV_MASK 0x0F /* All possible flags. */
+
+/* UDP matching stuff */
+struct ipt_udp
+{
+ u_int16_t spts[2]; /* Source port range. */
+ u_int16_t dpts[2]; /* Destination port range. */
+ u_int8_t invflags; /* Inverse flags */
+};
+
+/* Values for "invflags" field in struct ipt_udp. */
+#define IPT_UDP_INV_SRCPT 0x01 /* Invert the sense of source ports. */
+#define IPT_UDP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */
+#define IPT_UDP_INV_MASK 0x03 /* All possible flags. */
+
+/* ICMP matching stuff */
+struct ipt_icmp
+{
+ u_int8_t type; /* type to match */
+ u_int8_t code[2]; /* range of code */
+ u_int8_t invflags; /* Inverse flags */
+};
+
+/* Values for "inv" field for struct ipt_icmp. */
+#define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
+
+/* The argument to IPT_SO_GET_INFO */
+struct ipt_getinfo
+{
+ /* Which table: caller fills this in. */
+ char name[IPT_TABLE_MAXNAMELEN];
+
+ /* Kernel fills these in. */
+ /* Which hook entry points are valid: bitmask */
+ unsigned int valid_hooks;
+
+ /* Hook entry points: one per netfilter hook. */
+ unsigned int hook_entry[NF_IP_NUMHOOKS];
+
+ /* Underflow points. */
+ unsigned int underflow[NF_IP_NUMHOOKS];
+
+ /* Number of entries */
+ unsigned int num_entries;
+
+ /* Size of entries. */
+ unsigned int size;
+};
+
+/* The argument to IPT_SO_SET_REPLACE. */
+struct ipt_replace
+{
+ /* Which table. */
+ char name[IPT_TABLE_MAXNAMELEN];
+
+ /* Which hook entry points are valid: bitmask. You can't
+ change this. */
+ unsigned int valid_hooks;
+
+ /* Number of entries */
+ unsigned int num_entries;
+
+ /* Total size of new entries */
+ unsigned int size;
+
+ /* Hook entry points. */
+ unsigned int hook_entry[NF_IP_NUMHOOKS];
+
+ /* Underflow points. */
+ unsigned int underflow[NF_IP_NUMHOOKS];
+
+ /* Information about old entries: */
+ /* Number of counters (must be equal to current number of entries). */
+ unsigned int num_counters;
+
+ /* The old entries' counters. */
+ struct ipt_counters *counters;
+
+ /* The entries (hang off end: not really an array). */
+ struct ipt_entry entries[0];
+};
+
+/* The argument to IPT_SO_ADD_COUNTERS. */
+struct ipt_counters_info
+{
+ /* Which table. */
+ char name[IPT_TABLE_MAXNAMELEN];
+
+ unsigned int num_counters;
+
+ /* The counters (actually `number' of these). */
+ struct ipt_counters counters[0];
+};
+
+/* The argument to IPT_SO_GET_ENTRIES. */
+struct ipt_get_entries
+{
+ /* Which table: user fills this in. */
+ char name[IPT_TABLE_MAXNAMELEN];
+
+ /* User fills this in: total entry size. */
+ unsigned int size;
+
+ /* The entries. */
+ struct ipt_entry entrytable[0];
+};
+
+/* The argument to IPT_SO_GET_REVISION_*. Returns highest revision
+ * kernel supports, if >= revision. */
+struct ipt_get_revision
+{
+ char name[IPT_FUNCTION_MAXNAMELEN-1];
+
+ u_int8_t revision;
+};
+
+/* Standard return verdict, or do jump. */
+#define IPT_STANDARD_TARGET ""
+/* Error verdict. */
+#define IPT_ERROR_TARGET "ERROR"
+
+/* Helper functions */
+static __inline__ struct ipt_entry_target *
+ipt_get_target(struct ipt_entry *e)
+{
+ return (void *)e + e->target_offset;
+}
+
+/* fn returns 0 to continue iteration */
+#define IPT_MATCH_ITERATE(e, fn, args...) \
+({ \
+ unsigned int __i; \
+ int __ret = 0; \
+ struct ipt_entry_match *__match; \
+ \
+ for (__i = sizeof(struct ipt_entry); \
+ __i < (e)->target_offset; \
+ __i += __match->u.match_size) { \
+ __match = (void *)(e) + __i; \
+ \
+ __ret = fn(__match , ## args); \
+ if (__ret != 0) \
+ break; \
+ } \
+ __ret; \
+})
+
+/* fn returns 0 to continue iteration */
+#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
+({ \
+ unsigned int __i; \
+ int __ret = 0; \
+ struct ipt_entry *__entry; \
+ \
+ for (__i = 0; __i < (size); __i += __entry->next_offset) { \
+ __entry = (void *)(entries) + __i; \
+ \
+ __ret = fn(__entry , ## args); \
+ if (__ret != 0) \
+ break; \
+ } \
+ __ret; \
+})
+
+/*
+ * Main firewall chains definitions and global var's definitions.
+ */
+#endif /* _IPTABLES_H */
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