/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef __LINUX_NETFILTER_H

#define __LINUX_NETFILTER_H

#include <linux/types.h>

#include <linux/in.h>

#include <linux/in6.h>

/* Responses from hook functions. */

#define NF_DROP 0

#define NF_ACCEPT 1

#define NF_STOLEN 2

#define NF_QUEUE 3

#define NF_REPEAT 4

#define NF_STOP 5	/* Deprecated, for userspace nf_queue compatibility. */

#define NF_MAX_VERDICT NF_STOP

/* we overload the higher bits for encoding auxiliary data such as the queue

 * number or errno values. Not nice, but better than additional function

 * arguments. */

#define NF_VERDICT_MASK 0x000000ff

/* extra verdict flags have mask 0x0000ff00 */

#define NF_VERDICT_FLAG_QUEUE_BYPASS	0x00008000

/* queue number (NF_QUEUE) or errno (NF_DROP) */

#define NF_VERDICT_QMASK 0xffff0000

#define NF_VERDICT_QBITS 16

#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE)

#define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP)

/* only for userspace compatibility */

/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */

#define NF_VERDICT_BITS 16

enum nf_inet_hooks {

	NF_INET_PRE_ROUTING,

	NF_INET_LOCAL_IN,

	NF_INET_FORWARD,

	NF_INET_LOCAL_OUT,

	NF_INET_POST_ROUTING,

	NF_INET_NUMHOOKS

};

enum nf_dev_hooks {

	NF_NETDEV_INGRESS,

	NF_NETDEV_NUMHOOKS

};

enum {

	NFPROTO_UNSPEC =  0,

	NFPROTO_INET   =  1,

	NFPROTO_IPV4   =  2,

	NFPROTO_ARP    =  3,

	NFPROTO_NETDEV =  5,

	NFPROTO_BRIDGE =  7,

	NFPROTO_IPV6   = 10,

	NFPROTO_DECNET = 12,

	NFPROTO_NUMPROTO,

};

union nf_inet_addr {

	__u32		all[4];

	__be32		ip;

	__be32		ip6[4];

	struct in_addr	in;

	struct in6_addr	in6;

};

#endif /* __LINUX_NETFILTER_H */