Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/in.h>
7#include <linux/in6.h>
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 /* Deprecated, for userspace nf_queue compatibility. */
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 nf_dev_hooks {
55 NF_NETDEV_INGRESS,
56 NF_NETDEV_NUMHOOKS
57};
58
59enum {
60 NFPROTO_UNSPEC = 0,
61 NFPROTO_INET = 1,
62 NFPROTO_IPV4 = 2,
63 NFPROTO_ARP = 3,
64 NFPROTO_NETDEV = 5,
65 NFPROTO_BRIDGE = 7,
66 NFPROTO_IPV6 = 10,
67 NFPROTO_DECNET = 12,
68 NFPROTO_NUMPROTO,
69};
70
71union nf_inet_addr {
72 __u32 all[4];
73 __be32 ip;
74 __be32 ip6[4];
75 struct in_addr in;
76 struct in6_addr in6;
77};
78
79#endif /* _UAPI__LINUX_NETFILTER_H */