linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef __LINUX_NETFILTER_H
3 #define __LINUX_NETFILTER_H
4
5 #include <linux/types.h>
6
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
37 /* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
38 #define NF_VERDICT_BITS 16
39
40 enum nf_inet_hooks {
41 NF_INET_PRE_ROUTING,
42 NF_INET_LOCAL_IN,
43 NF_INET_FORWARD,
44 NF_INET_LOCAL_OUT,
45 NF_INET_POST_ROUTING,
46 NF_INET_NUMHOOKS,
47 NF_INET_INGRESS = NF_INET_NUMHOOKS,
48 };
49
50 enum nf_dev_hooks {
51 NF_NETDEV_INGRESS,
52 NF_NETDEV_EGRESS,
53 NF_NETDEV_NUMHOOKS
54 };
55
56 enum {
57 NFPROTO_UNSPEC = 0,
58 NFPROTO_INET = 1,
59 NFPROTO_IPV4 = 2,
60 NFPROTO_ARP = 3,
61 NFPROTO_NETDEV = 5,
62 NFPROTO_BRIDGE = 7,
63 NFPROTO_IPV6 = 10,
64 NFPROTO_DECNET = 12,
65 NFPROTO_NUMPROTO,
66 };
67
68 union nf_inet_addr {
69 __u32 all[4];
70 __be32 ip;
71 __be32 ip6[4];
72 struct in_addr in;
73 struct in6_addr in6;
74 };
75
76 #endif /* __LINUX_NETFILTER_H */
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