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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

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source code of linux/include/linux/netfilter_ipv4/ip_tables.h