1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * 25-Jul-1998 Major changes to allow for ip chain table
4 *
5 * 3-Jan-2000 Named tables to allow packet selection for different uses.
6 */
7
8/*
9 * 	Format of an IP firewall descriptor
10 *
11 * 	src, dst, src_mask, dst_mask are always stored in network byte order.
12 * 	flags are stored in host byte order (of course).
13 * 	Port numbers are stored in HOST byte order.
14 */
15#ifndef _IPTABLES_H
16#define _IPTABLES_H
17
18#include <linux/if.h>
19#include <linux/in.h>
20#include <linux/init.h>
21#include <linux/ip.h>
22#include <linux/skbuff.h>
23#include <uapi/linux/netfilter_ipv4/ip_tables.h>
24
25int ipt_register_table(struct net *net, const struct xt_table *table,
26		       const struct ipt_replace *repl,
27		       const struct nf_hook_ops *ops);
28
29void ipt_unregister_table_pre_exit(struct net *net, const char *name);
30void ipt_unregister_table_exit(struct net *net, const char *name);
31
32/* Standard entry. */
33struct ipt_standard {
34	struct ipt_entry entry;
35	struct xt_standard_target target;
36};
37
38struct ipt_error {
39	struct ipt_entry entry;
40	struct xt_error_target target;
41};
42
43#define IPT_ENTRY_INIT(__size)						       \
44{									       \
45	.target_offset	= sizeof(struct ipt_entry),			       \
46	.next_offset	= (__size),					       \
47}
48
49#define IPT_STANDARD_INIT(__verdict)					       \
50{									       \
51	.entry		= IPT_ENTRY_INIT(sizeof(struct ipt_standard)),	       \
52	.target		= XT_TARGET_INIT(XT_STANDARD_TARGET,		       \
53					 sizeof(struct xt_standard_target)),   \
54	.target.verdict	= -(__verdict) - 1,				       \
55}
56
57#define IPT_ERROR_INIT							       \
58{									       \
59	.entry		= IPT_ENTRY_INIT(sizeof(struct ipt_error)),	       \
60	.target		= XT_TARGET_INIT(XT_ERROR_TARGET,		       \
61					 sizeof(struct xt_error_target)),      \
62	.target.errorname = "ERROR",					       \
63}
64
65extern void *ipt_alloc_initial_table(const struct xt_table *);
66extern unsigned int ipt_do_table(void *priv,
67				 struct sk_buff *skb,
68				 const struct nf_hook_state *state);
69
70#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
71#include <net/compat.h>
72
73struct compat_ipt_entry {
74	struct ipt_ip ip;
75	compat_uint_t nfcache;
76	__u16 target_offset;
77	__u16 next_offset;
78	compat_uint_t comefrom;
79	struct compat_xt_counters counters;
80	unsigned char elems[];
81};
82
83/* Helper functions */
84static inline struct xt_entry_target *
85compat_ipt_get_target(struct compat_ipt_entry *e)
86{
87	return (void *)e + e->target_offset;
88}
89
90#endif /* CONFIG_COMPAT */
91#endif /* _IPTABLES_H */
92