linux/include/linux/netfilter_ipv4.h
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   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
  57enum 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_HELPER = 300,
  70        NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
  71        NF_IP_PRI_LAST = INT_MAX,
  72};
  73
  74/* Arguments for setsockopt SOL_IP: */
  75/* 2.0 firewalling went from 64 through 71 (and +256, +512, etc). */
  76/* 2.2 firewalling (+ masq) went from 64 through 76 */
  77/* 2.4 firewalling went 64 through 67. */
  78#define SO_ORIGINAL_DST 80
  79
  80#ifdef __KERNEL__
  81extern int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type);
  82extern int ip_xfrm_me_harder(struct sk_buff *skb);
  83extern __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
  84                                   unsigned int dataoff, u_int8_t protocol);
  85#endif /*__KERNEL__*/
  86
  87#endif /*__LINUX_IP_NETFILTER_H*/
  88
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