1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI__LINUX_NETFILTER_H
3#define _UAPI__LINUX_NETFILTER_H
4
5#include <linux/types.h>
6#include <linux/compiler.h>
7#include <linux/in.h>
8#include <linux/in6.h>
9
10/* Responses from hook functions. */
11#define NF_DROP 0
12#define NF_ACCEPT 1
13#define NF_STOLEN 2
14#define NF_QUEUE 3
15#define NF_REPEAT 4
16#define NF_STOP 5	/* Deprecated, for userspace nf_queue compatibility. */
17#define NF_MAX_VERDICT NF_STOP
18
19/* we overload the higher bits for encoding auxiliary data such as the queue
20 * number or errno values. Not nice, but better than additional function
21 * arguments. */
22#define NF_VERDICT_MASK 0x000000ff
23
24/* extra verdict flags have mask 0x0000ff00 */
25#define NF_VERDICT_FLAG_QUEUE_BYPASS	0x00008000
26
27/* queue number (NF_QUEUE) or errno (NF_DROP) */
28#define NF_VERDICT_QMASK 0xffff0000
29#define NF_VERDICT_QBITS 16
30
31#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE)
32
33#define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP)
34
35/* only for userspace compatibility */
36#ifndef __KERNEL__
37/* Generic cache responses from hook functions.
38   <= 0x2000 is used for protocol-flags. */
39#define NFC_UNKNOWN 0x4000
40#define NFC_ALTERED 0x8000
41
42/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
43#define NF_VERDICT_BITS 16
44#endif
45
46enum nf_inet_hooks {
47	NF_INET_PRE_ROUTING,
48	NF_INET_LOCAL_IN,
49	NF_INET_FORWARD,
50	NF_INET_LOCAL_OUT,
51	NF_INET_POST_ROUTING,
52	NF_INET_NUMHOOKS
53};
54
55enum nf_dev_hooks {
56	NF_NETDEV_INGRESS,
57	NF_NETDEV_NUMHOOKS
58};
59
60enum {
61	NFPROTO_UNSPEC =  0,
62	NFPROTO_INET   =  1,
63	NFPROTO_IPV4   =  2,
64	NFPROTO_ARP    =  3,
65	NFPROTO_NETDEV =  5,
66	NFPROTO_BRIDGE =  7,
67	NFPROTO_IPV6   = 10,
68	NFPROTO_DECNET = 12,
69	NFPROTO_NUMPROTO,
70};
71
72union nf_inet_addr {
73	__u32		all[4];
74	__be32		ip;
75	__be32		ip6[4];
76	struct in_addr	in;
77	struct in6_addr	in6;
78};
79
80#endif /* _UAPI__LINUX_NETFILTER_H */
81