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