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