1 #ifndef __LINUX_IP_NETFILTER_H
2 #define __LINUX_IP_NETFILTER_H
4 /* IPv4-specific defines for netfilter.
5 * (C)1998 Rusty Russell -- This code is GPL.
8 #include <linux/netfilter.h>
10 /* only for userspace compatibility */
14 #define NFC_IP_SRC 0x0001
15 /* Dest IP address. */
16 #define NFC_IP_DST 0x0002
18 #define NFC_IP_IF_IN 0x0004
20 #define NFC_IP_IF_OUT 0x0008
22 #define NFC_IP_TOS 0x0010
24 #define NFC_IP_PROTO 0x0020
26 #define NFC_IP_OPTIONS 0x0040
28 #define NFC_IP_FRAG 0x0080
30 /* Per-protocol information: only matters if proto match. */
32 #define NFC_IP_TCPFLAGS 0x0100
34 #define NFC_IP_SRC_PT 0x0200
36 #define NFC_IP_DST_PT 0x0400
37 /* Something else about the proto */
38 #define NFC_IP_PROTO_UNKNOWN 0x2000
39 #endif /* ! __KERNEL__ */
42 /* After promisc drops, checksum checks. */
43 #define NF_IP_PRE_ROUTING 0
44 /* If the packet is destined for this box. */
45 #define NF_IP_LOCAL_IN 1
46 /* If the packet is destined for another interface. */
47 #define NF_IP_FORWARD 2
48 /* Packets coming from a local process. */
49 #define NF_IP_LOCAL_OUT 3
50 /* Packets about to hit the wire. */
51 #define NF_IP_POST_ROUTING 4
52 #define NF_IP_NUMHOOKS 5
54 enum nf_ip_hook_priorities {
55 NF_IP_PRI_FIRST = INT_MIN,
56 NF_IP_PRI_CONNTRACK_DEFRAG = -400,
58 NF_IP_PRI_SELINUX_FIRST = -225,
59 NF_IP_PRI_CONNTRACK = -200,
60 NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
61 NF_IP_PRI_MANGLE = -150,
62 NF_IP_PRI_NAT_DST = -100,
63 NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
65 NF_IP_PRI_NAT_SRC = 100,
66 NF_IP_PRI_SELINUX_LAST = 225,
67 NF_IP_PRI_CONNTRACK_HELPER = INT_MAX - 2,
68 NF_IP_PRI_NAT_SEQ_ADJUST = INT_MAX - 1,
69 NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
70 NF_IP_PRI_LAST = INT_MAX,
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
80 extern int ip_route_me_harder(struct sk_buff **pskb, unsigned addr_type);
81 extern int ip_xfrm_me_harder(struct sk_buff **pskb);
82 extern unsigned int nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
83 unsigned int dataoff, u_int8_t protocol);
86 #endif /*__LINUX_IP_NETFILTER_H*/