Linux Kernel  3.7.1
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netfilter.h
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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 
52 };
53 
54 enum {
62 };
63 
64 union nf_inet_addr {
65  __u32 all[4];
67  __be32 ip6[4];
68  struct in_addr in;
69  struct in6_addr in6;
70 };
71 
72 #endif /* _UAPI__LINUX_NETFILTER_H */