LXR linux/include/linux/netfilter

   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/* IP Hooks */
  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
  53
  54enum nf_ip_hook_priorities {
  55        NF_IP_PRI_FIRST = INT_MIN,
  56        NF_IP_PRI_CONNTRACK_DEFRAG = -400,
  57        NF_IP_PRI_RAW = -300,
  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,
  64        NF_IP_PRI_FILTER = 0,
  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,
  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__
  80extern int ip_route_me_harder(struct sk_buff **pskb);
  81extern int ip_xfrm_me_harder(struct sk_buff **pskb);
  82extern unsigned int 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