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/ip.h>
21#include <linux/skbuff.h>
22
23#include <linux/init.h>
24#include <uapi/linux/netfilter_ipv4/ip_tables.h>
25
26extern void ipt_init(void) __init;
27
28int ipt_register_table(struct net *net, const struct xt_table *table,
29 const struct ipt_replace *repl,
30 const struct nf_hook_ops *ops, struct xt_table **res);
31void ipt_unregister_table(struct net *net, struct xt_table *table,
32 const struct nf_hook_ops *ops);
33
34/* Standard entry. */
35struct ipt_standard {
36 struct ipt_entry entry;
37 struct xt_standard_target target;
38};
39
40struct ipt_error {
41 struct ipt_entry entry;
42 struct xt_error_target target;
43};
44
45#define IPT_ENTRY_INIT(__size) \
46{ \
47 .target_offset = sizeof(struct ipt_entry), \
48 .next_offset = (__size), \
49}
50
51#define IPT_STANDARD_INIT(__verdict) \
52{ \
53 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \
54 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
55 sizeof(struct xt_standard_target)), \
56 .target.verdict = -(__verdict) - 1, \
57}
58
59#define IPT_ERROR_INIT \
60{ \
61 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \
62 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \
63 sizeof(struct xt_error_target)), \
64 .target.errorname = "ERROR", \
65}
66
67extern void *ipt_alloc_initial_table(const struct xt_table *);
68extern unsigned int ipt_do_table(struct sk_buff *skb,
69 const struct nf_hook_state *state,
70 struct xt_table *table);
71
72#ifdef CONFIG_COMPAT
73#include <net/compat.h>
74
75struct compat_ipt_entry {
76 struct ipt_ip ip;
77 compat_uint_t nfcache;
78 __u16 target_offset;
79 __u16 next_offset;
80 compat_uint_t comefrom;
81 struct compat_xt_counters counters;
82 unsigned char elems[0];
83};
84
85/* Helper functions */
86static inline struct xt_entry_target *
87compat_ipt_get_target(struct compat_ipt_entry *e)
88{
89 return (void *)e + e->target_offset;
90}
91
92#endif /* CONFIG_COMPAT */
93#endif /* _IPTABLES_H */
94