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