/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* 25-Jul-1998 Major changes to allow for ip chain table
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*
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* 3-Jan-2000 Named tables to allow packet selection for different uses.
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*/
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/*
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* Format of an IP firewall descriptor
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*
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* src, dst, src_mask, dst_mask are always stored in network byte order.
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* flags are stored in host byte order (of course).
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* Port numbers are stored in HOST byte order.
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*/
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#ifndef _UAPI_IPTABLES_H
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#define _UAPI_IPTABLES_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/if.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter/x_tables.h>
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#ifndef __KERNEL__
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#define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
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#define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
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#define ipt_match xt_match
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#define ipt_target xt_target
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#define ipt_table xt_table
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#define ipt_get_revision xt_get_revision
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#define ipt_entry_match xt_entry_match
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#define ipt_entry_target xt_entry_target
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#define ipt_standard_target xt_standard_target
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#define ipt_error_target xt_error_target
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#define ipt_counters xt_counters
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#define IPT_CONTINUE XT_CONTINUE
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#define IPT_RETURN XT_RETURN
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/* This group is older than old (iptables < v1.4.0-rc1~89) */
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#include <linux/netfilter/xt_tcpudp.h>
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#define ipt_udp xt_udp
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#define ipt_tcp xt_tcp
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#define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
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#define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
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#define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
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#define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
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#define IPT_TCP_INV_MASK XT_TCP_INV_MASK
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#define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
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#define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
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#define IPT_UDP_INV_MASK XT_UDP_INV_MASK
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/* The argument to IPT_SO_ADD_COUNTERS. */
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#define ipt_counters_info xt_counters_info
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/* Standard return verdict, or do jump. */
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#define IPT_STANDARD_TARGET XT_STANDARD_TARGET
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/* Error verdict. */
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#define IPT_ERROR_TARGET XT_ERROR_TARGET
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/* fn returns 0 to continue iteration */
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#define IPT_MATCH_ITERATE(e, fn, args...) \
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XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
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/* fn returns 0 to continue iteration */
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#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
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XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
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#endif
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/* Yes, Virginia, you have to zero the padding. */
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struct ipt_ip {
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/* Source and destination IP addr */
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struct in_addr src, dst;
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/* Mask for src and dest IP addr */
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struct in_addr smsk, dmsk;
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char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
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unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
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/* Protocol, 0 = ANY */
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__u16 proto;
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/* Flags word */
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__u8 flags;
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/* Inverse flags */
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__u8 invflags;
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};
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/* Values for "flag" field in struct ipt_ip (general ip structure). */
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#define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
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#define IPT_F_GOTO 0x02 /* Set if jump is a goto */
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#define IPT_F_MASK 0x03 /* All possible flag bits mask. */
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/* Values for "inv" field in struct ipt_ip. */
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#define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
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#define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
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#define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
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#define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
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#define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
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#define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
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#define IPT_INV_PROTO XT_INV_PROTO
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#define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
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/* This structure defines each of the firewall rules. Consists of 3
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parts which are 1) general IP header stuff 2) match specific
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stuff 3) the target to perform if the rule matches */
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struct ipt_entry {
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struct ipt_ip ip;
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/* Mark with fields that we care about. */
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unsigned int nfcache;
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/* Size of ipt_entry + matches */
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__u16 target_offset;
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/* Size of ipt_entry + matches + target */
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__u16 next_offset;
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/* Back pointer */
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unsigned int comefrom;
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/* Packet and byte counters. */
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struct xt_counters counters;
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/* The matches (if any), then the target. */
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unsigned char elems[0];
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};
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/*
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* New IP firewall options for [gs]etsockopt at the RAW IP level.
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* Unlike BSD Linux inherits IP options so you don't have to use a raw
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* socket for this. Instead we check rights in the calls.
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*
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* ATTENTION: check linux/in.h before adding new number here.
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*/
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#define IPT_BASE_CTL 64
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#define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
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#define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
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#define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
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#define IPT_SO_GET_INFO (IPT_BASE_CTL)
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#define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
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#define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
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#define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
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#define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
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/* ICMP matching stuff */
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struct ipt_icmp {
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__u8 type; /* type to match */
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__u8 code[2]; /* range of code */
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__u8 invflags; /* Inverse flags */
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};
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/* Values for "inv" field for struct ipt_icmp. */
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#define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
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/* The argument to IPT_SO_GET_INFO */
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struct ipt_getinfo {
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/* Which table: caller fills this in. */
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char name[XT_TABLE_MAXNAMELEN];
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/* Kernel fills these in. */
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/* Which hook entry points are valid: bitmask */
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unsigned int valid_hooks;
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/* Hook entry points: one per netfilter hook. */
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unsigned int hook_entry[NF_INET_NUMHOOKS];
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/* Underflow points. */
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unsigned int underflow[NF_INET_NUMHOOKS];
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/* Number of entries */
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unsigned int num_entries;
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/* Size of entries. */
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unsigned int size;
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};
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/* The argument to IPT_SO_SET_REPLACE. */
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struct ipt_replace {
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/* Which table. */
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char name[XT_TABLE_MAXNAMELEN];
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/* Which hook entry points are valid: bitmask. You can't
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change this. */
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unsigned int valid_hooks;
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/* Number of entries */
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unsigned int num_entries;
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/* Total size of new entries */
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unsigned int size;
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/* Hook entry points. */
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unsigned int hook_entry[NF_INET_NUMHOOKS];
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/* Underflow points. */
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unsigned int underflow[NF_INET_NUMHOOKS];
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/* Information about old entries: */
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/* Number of counters (must be equal to current number of entries). */
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unsigned int num_counters;
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/* The old entries' counters. */
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struct xt_counters __user *counters;
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/* The entries (hang off end: not really an array). */
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struct ipt_entry entries[0];
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};
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/* The argument to IPT_SO_GET_ENTRIES. */
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struct ipt_get_entries {
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/* Which table: user fills this in. */
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char name[XT_TABLE_MAXNAMELEN];
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/* User fills this in: total entry size. */
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unsigned int size;
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/* The entries. */
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struct ipt_entry entrytable[0];
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};
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/* Helper functions */
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static __inline__ struct xt_entry_target *
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ipt_get_target(struct ipt_entry *e)
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{
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return (struct xt_entry_target *)((char *)e + e->target_offset);
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}
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/*
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* Main firewall chains definitions and global var's definitions.
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*/
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#endif /* _UAPI_IPTABLES_H */
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