1 #ifndef __LINUX_IP_NETFILTER_H
2 #define __LINUX_IP_NETFILTER_H
3 
4 /* IPv4-specific defines for netfilter.
5  * (C)1998 Rusty Russell -- This code is GPL.
6  */
7 
8 #include <linux/netfilter.h>
9 
10 /* only for userspace compatibility */
11 #ifndef __KERNEL__
12 
13 #include <limits.h> /* for INT_MIN, INT_MAX */
14 
15 /* IP Cache bits. */
16 /* Src IP address. */
17 #define NFC_IP_SRC		0x0001
18 /* Dest IP address. */
19 #define NFC_IP_DST		0x0002
20 /* Input device. */
21 #define NFC_IP_IF_IN		0x0004
22 /* Output device. */
23 #define NFC_IP_IF_OUT		0x0008
24 /* TOS. */
25 #define NFC_IP_TOS		0x0010
26 /* Protocol. */
27 #define NFC_IP_PROTO		0x0020
28 /* IP options. */
29 #define NFC_IP_OPTIONS		0x0040
30 /* Frag & flags. */
31 #define NFC_IP_FRAG		0x0080
32 
33 /* Per-protocol information: only matters if proto match. */
34 /* TCP flags. */
35 #define NFC_IP_TCPFLAGS		0x0100
36 /* Source port. */
37 #define NFC_IP_SRC_PT		0x0200
38 /* Dest port. */
39 #define NFC_IP_DST_PT		0x0400
40 /* Something else about the proto */
41 #define NFC_IP_PROTO_UNKNOWN	0x2000
42 
43 /* IP Hooks */
44 /* After promisc drops, checksum checks. */
45 #define NF_IP_PRE_ROUTING	0
46 /* If the packet is destined for this box. */
47 #define NF_IP_LOCAL_IN		1
48 /* If the packet is destined for another interface. */
49 #define NF_IP_FORWARD		2
50 /* Packets coming from a local process. */
51 #define NF_IP_LOCAL_OUT		3
52 /* Packets about to hit the wire. */
53 #define NF_IP_POST_ROUTING	4
54 #define NF_IP_NUMHOOKS		5
55 #endif /* ! __KERNEL__ */
56 
57 enum nf_ip_hook_priorities {
58 	NF_IP_PRI_FIRST = INT_MIN,
59 	NF_IP_PRI_CONNTRACK_DEFRAG = -400,
60 	NF_IP_PRI_RAW = -300,
61 	NF_IP_PRI_SELINUX_FIRST = -225,
62 	NF_IP_PRI_CONNTRACK = -200,
63 	NF_IP_PRI_MANGLE = -150,
64 	NF_IP_PRI_NAT_DST = -100,
65 	NF_IP_PRI_FILTER = 0,
66 	NF_IP_PRI_SECURITY = 50,
67 	NF_IP_PRI_NAT_SRC = 100,
68 	NF_IP_PRI_SELINUX_LAST = 225,
69 	NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
70 	NF_IP_PRI_LAST = INT_MAX,
71 };
72 
73 /* Arguments for setsockopt SOL_IP: */
74 /* 2.0 firewalling went from 64 through 71 (and +256, +512, etc). */
75 /* 2.2 firewalling (+ masq) went from 64 through 76 */
76 /* 2.4 firewalling went 64 through 67. */
77 #define SO_ORIGINAL_DST 80
78 
79 #ifdef __KERNEL__
80 extern int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type);
81 extern int ip_xfrm_me_harder(struct sk_buff *skb);
82 extern __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
83 				   unsigned int dataoff, u_int8_t protocol);
84 #endif /*__KERNEL__*/
85 
86 #endif /*__LINUX_IP_NETFILTER_H*/
87