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