1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Format of an ARP firewall descriptor
4 *
5 * src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in
6 * network byte order.
7 * flags are stored in host byte order (of course).
8 */
9#ifndef _ARPTABLES_H
10#define _ARPTABLES_H
11
12#include <linux/if.h>
13#include <linux/in.h>
14#include <linux/if_arp.h>
15#include <linux/skbuff.h>
16#include <uapi/linux/netfilter_arp/arp_tables.h>
17
18/* Standard entry. */
19struct arpt_standard {
20 struct arpt_entry entry;
21 struct xt_standard_target target;
22};
23
24struct arpt_error {
25 struct arpt_entry entry;
26 struct xt_error_target target;
27};
28
29#define ARPT_ENTRY_INIT(__size) \
30{ \
31 .target_offset = sizeof(struct arpt_entry), \
32 .next_offset = (__size), \
33}
34
35#define ARPT_STANDARD_INIT(__verdict) \
36{ \
37 .entry = ARPT_ENTRY_INIT(sizeof(struct arpt_standard)), \
38 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
39 sizeof(struct xt_standard_target)), \
40 .target.verdict = -(__verdict) - 1, \
41}
42
43#define ARPT_ERROR_INIT \
44{ \
45 .entry = ARPT_ENTRY_INIT(sizeof(struct arpt_error)), \
46 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \
47 sizeof(struct xt_error_target)), \
48 .target.errorname = "ERROR", \
49}
50
51extern void *arpt_alloc_initial_table(const struct xt_table *);
52int arpt_register_table(struct net *net, const struct xt_table *table,
53 const struct arpt_replace *repl,
54 const struct nf_hook_ops *ops);
55void arpt_unregister_table(struct net *net, const char *name);
56void arpt_unregister_table_pre_exit(struct net *net, const char *name);
57extern unsigned int arpt_do_table(void *priv, struct sk_buff *skb,
58 const struct nf_hook_state *state);
59
60#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
61#include <net/compat.h>
62
63struct compat_arpt_entry {
64 struct arpt_arp arp;
65 __u16 target_offset;
66 __u16 next_offset;
67 compat_uint_t comefrom;
68 struct compat_xt_counters counters;
69 unsigned char elems[];
70};
71
72static inline struct xt_entry_target *
73compat_arpt_get_target(struct compat_arpt_entry *e)
74{
75 return (void *)e + e->target_offset;
76}
77
78#endif /* CONFIG_COMPAT */
79#endif /* _ARPTABLES_H */
80