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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* 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/types.h>
#include <linux/if.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
#define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
#define ipt_match xt_match
#define ipt_target xt_target
#define ipt_table xt_table
#define ipt_get_revision xt_get_revision
#define ipt_entry_match xt_entry_match
#define ipt_entry_target xt_entry_target
#define ipt_standard_target xt_standard_target
#define ipt_error_target xt_error_target
#define ipt_counters xt_counters
#define IPT_CONTINUE XT_CONTINUE
#define IPT_RETURN XT_RETURN
/* This group is older than old (iptables < v1.4.0-rc1~89) */
#include <linux/netfilter/xt_tcpudp.h>
#define ipt_udp xt_udp
#define ipt_tcp xt_tcp
#define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
#define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
#define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
#define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
#define IPT_TCP_INV_MASK XT_TCP_INV_MASK
#define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
#define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
#define IPT_UDP_INV_MASK XT_UDP_INV_MASK
/* The argument to IPT_SO_ADD_COUNTERS. */
#define ipt_counters_info xt_counters_info
/* Standard return verdict, or do jump. */
#define IPT_STANDARD_TARGET XT_STANDARD_TARGET
/* Error verdict. */
#define IPT_ERROR_TARGET XT_ERROR_TARGET
/* fn returns 0 to continue iteration */
#define IPT_MATCH_ITERATE(e, fn, args...) \
XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
/* fn returns 0 to continue iteration */
#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
/* 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 */
__u16 proto;
/* Flags word */
__u8 flags;
/* Inverse flags */
__u8 invflags;
};
/* 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_GOTO 0x02 /* Set if jump is a goto */
#define IPT_F_MASK 0x03 /* 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 XT_INV_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 */
__u16 target_offset;
/* Size of ipt_entry + matches + target */
__u16 next_offset;
/* Back pointer */
unsigned int comefrom;
/* Packet and byte counters. */
struct xt_counters counters;
/* The matches (if any), then the target. */
unsigned char elems[];
};
/*
* 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.
*
* ATTENTION: check linux/in.h before adding new number here.
*/
#define IPT_BASE_CTL 64
#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
/* ICMP matching stuff */
struct ipt_icmp {
__u8 type; /* type to match */
__u8 code[2]; /* range of code */
__u8 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[XT_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_INET_NUMHOOKS];
/* Underflow points. */
unsigned int underflow[NF_INET_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[XT_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_INET_NUMHOOKS];
/* Underflow points. */
unsigned int underflow[NF_INET_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 xt_counters *counters;
/* The entries (hang off end: not really an array). */
struct ipt_entry entries[];
};
/* The argument to IPT_SO_GET_ENTRIES. */
struct ipt_get_entries {
/* Which table: user fills this in. */
char name[XT_TABLE_MAXNAMELEN];
/* User fills this in: total entry size. */
unsigned int size;
/* The entries. */
struct ipt_entry entrytable[];
};
/* Helper functions */
static __inline__ struct xt_entry_target *
ipt_get_target(struct ipt_entry *e)
{
return (struct xt_entry_target *)((char *)e + e->target_offset);
}
/*
* Main firewall chains definitions and global var's definitions.
*/
#endif /* _IPTABLES_H */