include/linux/netfilter_ipv4.h

   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
  57 enum 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_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__
  80 extern int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type);
  81 extern int ip_xfrm_me_harder(struct sk_buff *skb);
  82 extern __sum16 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*/