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/* IP Cache bits. */
13/* Src IP address. */
14#define NFC_IP_SRC		0x0001
15/* Dest IP address. */
16#define NFC_IP_DST		0x0002
17/* Input device. */
18#define NFC_IP_IF_IN		0x0004
19/* Output device. */
20#define NFC_IP_IF_OUT		0x0008
21/* TOS. */
22#define NFC_IP_TOS		0x0010
23/* Protocol. */
24#define NFC_IP_PROTO		0x0020
25/* IP options. */
26#define NFC_IP_OPTIONS		0x0040
27/* Frag & flags. */
28#define NFC_IP_FRAG		0x0080
29
30/* Per-protocol information: only matters if proto match. */
31/* TCP flags. */
32#define NFC_IP_TCPFLAGS		0x0100
33/* Source port. */
34#define NFC_IP_SRC_PT		0x0200
35/* Dest port. */
36#define NFC_IP_DST_PT		0x0400
37/* Something else about the proto */
38#define NFC_IP_PROTO_UNKNOWN	0x2000
39#endif /* ! __KERNEL__ */
40
41/* Cone NAT, Otherwise Symmetric NAT */
42#define NFC_IP_CONE_NAT		0x0800
43#define NFC_IP_CONE_NAT_ALTERED	0x1000
44
45/* IP Hooks */
46/* After promisc drops, checksum checks. */
47#define NF_IP_PRE_ROUTING	0
48/* If the packet is destined for this box. */
49#define NF_IP_LOCAL_IN		1
50/* If the packet is destined for another interface. */
51#define NF_IP_FORWARD		2
52/* Packets coming from a local process. */
53#define NF_IP_LOCAL_OUT		3
54/* Packets about to hit the wire. */
55#define NF_IP_POST_ROUTING	4
56#define NF_IP_NUMHOOKS		5
57
58enum nf_ip_hook_priorities {
59	NF_IP_PRI_FIRST = INT_MIN,
60	NF_IP_PRI_CONNTRACK_DEFRAG = -400,
61	NF_IP_PRI_RAW = -300,
62	NF_IP_PRI_SELINUX_FIRST = -225,
63	NF_IP_PRI_CONNTRACK = -200,
64	NF_IP_PRI_MANGLE = -150,
65	NF_IP_PRI_NAT_DST = -100,
66	NF_IP_PRI_FILTER = 0,
67	NF_IP_PRI_NAT_SRC = 100,
68	NF_IP_PRI_SELINUX_LAST = 225,
69	NF_IP_PRI_CONNTRACK_HELPER = INT_MAX - 2,
70	NF_IP_PRI_NAT_SEQ_ADJUST = INT_MAX - 1,
71	NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
72	NF_IP_PRI_LAST = INT_MAX,
73};
74
75/* Arguments for setsockopt SOL_IP: */
76/* 2.0 firewalling went from 64 through 71 (and +256, +512, etc). */
77/* 2.2 firewalling (+ masq) went from 64 through 76 */
78/* 2.4 firewalling went 64 through 67. */
79#define SO_ORIGINAL_DST 80
80
81#ifdef __KERNEL__
82extern int ip_route_me_harder(struct sk_buff **pskb, unsigned addr_type);
83extern int ip_xfrm_me_harder(struct sk_buff **pskb);
84extern __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
85				   unsigned int dataoff, u_int8_t protocol);
86#endif /*__KERNEL__*/
87
88#endif /*__LINUX_IP_NETFILTER_H*/
89