/* SPDX-License-Identifier: GPL-2.0 */
/*
* Format of an ARP firewall descriptor
*
* src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in
* network byte order.
* flags are stored in host byte order (of course).
*/
#ifndef _ARPTABLES_H
#define _ARPTABLES_H
#include <linux/if.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <uapi/linux/netfilter_arp/arp_tables.h>
/* Standard entry. */
struct arpt_standard {
struct arpt_entry entry;
struct xt_standard_target target;
};
struct arpt_error {
struct arpt_entry entry;
struct xt_error_target target;
};
#define ARPT_ENTRY_INIT(__size) \
{ \
.target_offset = sizeof(struct arpt_entry), \
.next_offset = (__size), \
}
#define ARPT_STANDARD_INIT(__verdict) \
{ \
.entry = ARPT_ENTRY_INIT(sizeof(struct arpt_standard)), \
.target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
sizeof(struct xt_standard_target)), \
.target.verdict = -(__verdict) - 1, \
}
#define ARPT_ERROR_INIT \
{ \
.entry = ARPT_ENTRY_INIT(sizeof(struct arpt_error)), \
.target = XT_TARGET_INIT(XT_ERROR_TARGET, \
sizeof(struct xt_error_target)), \
.target.errorname = "ERROR", \
}
extern void *arpt_alloc_initial_table(const struct xt_table *);
int arpt_register_table(struct net *net, const struct xt_table *table,
const struct arpt_replace *repl,
const struct nf_hook_ops *ops);
void arpt_unregister_table(struct net *net, const char *name);
void arpt_unregister_table_pre_exit(struct net *net, const char *name);
extern unsigned int arpt_do_table(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
#include <net/compat.h>
struct compat_arpt_entry {
struct arpt_arp arp;
__u16 target_offset;
__u16 next_offset;
compat_uint_t comefrom;
struct compat_xt_counters counters;
unsigned char elems[];
};
static inline struct xt_entry_target *
compat_arpt_get_target(struct compat_arpt_entry *e)
{
return (void *)e + e->target_offset;
}
#endif /* CONFIG_COMPAT */
#endif /* _ARPTABLES_H */