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/config.h>
   9 #include <linux/netfilter.h>
  10
  11 /* IP Cache bits. */
  12 /* Src IP address. */
  13 #define NFC_IP_SRC              0x0001
  14 /* Dest IP address. */
  15 #define NFC_IP_DST              0x0002
  16 /* Input device. */
  17 #define NFC_IP_IF_IN            0x0004
  18 /* Output device. */
  19 #define NFC_IP_IF_OUT           0x0008
  20 /* TOS. */
  21 #define NFC_IP_TOS              0x0010
  22 /* Protocol. */
  23 #define NFC_IP_PROTO            0x0020
  24 /* IP options. */
  25 #define NFC_IP_OPTIONS          0x0040
  26 /* Frag & flags. */
  27 #define NFC_IP_FRAG             0x0080
  28
  29 /* Per-protocol information: only matters if proto match. */
  30 /* TCP flags. */
  31 #define NFC_IP_TCPFLAGS         0x0100
  32 /* Source port. */
  33 #define NFC_IP_SRC_PT           0x0200
  34 /* Dest port. */
  35 #define NFC_IP_DST_PT           0x0400
  36 /* Something else about the proto */
  37 #define NFC_IP_PROTO_UNKNOWN    0x2000
  38
  39 /* IP Hooks */
  40 /* After promisc drops, checksum checks. */
  41 #define NF_IP_PRE_ROUTING       0
  42 /* If the packet is destined for this box. */
  43 #define NF_IP_LOCAL_IN          1
  44 /* If the packet is destined for another interface. */
  45 #define NF_IP_FORWARD           2
  46 /* Packets coming from a local process. */
  47 #define NF_IP_LOCAL_OUT         3
  48 /* Packets about to hit the wire. */
  49 #define NF_IP_POST_ROUTING      4
  50 #define NF_IP_NUMHOOKS          5
  51
  52 enum nf_ip_hook_priorities {
  53         NF_IP_PRI_FIRST = INT_MIN,
  54         NF_IP_PRI_CONNTRACK_DEFRAG = -400,
  55         NF_IP_PRI_RAW = -300,
  56         NF_IP_PRI_SELINUX_FIRST = -225,
  57         NF_IP_PRI_CONNTRACK = -200,
  58         NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
  59         NF_IP_PRI_MANGLE = -150,
  60         NF_IP_PRI_NAT_DST = -100,
  61         NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
  62         NF_IP_PRI_FILTER = 0,
  63         NF_IP_PRI_NAT_SRC = 100,
  64         NF_IP_PRI_SELINUX_LAST = 225,
  65         NF_IP_PRI_CONNTRACK_HELPER = INT_MAX - 2,
  66         NF_IP_PRI_NAT_SEQ_ADJUST = INT_MAX - 1,
  67         NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
  68         NF_IP_PRI_LAST = INT_MAX,
  69 };
  70
  71 /* Arguments for setsockopt SOL_IP: */
  72 /* 2.0 firewalling went from 64 through 71 (and +256, +512, etc). */
  73 /* 2.2 firewalling (+ masq) went from 64 through 76 */
  74 /* 2.4 firewalling went 64 through 67. */
  75 #define SO_ORIGINAL_DST 80
  76
  77 #ifdef __KERNEL__
  78 extern int ip_route_me_harder(struct sk_buff **pskb);
  79
  80 /* Call this before modifying an existing IP packet: ensures it is
  81    modifiable and linear to the point you care about (writable_len).
  82    Returns true or false. */
  83 extern int skb_ip_make_writable(struct sk_buff **pskb,
  84                                 unsigned int writable_len);
  85 #endif /*__KERNEL__*/
  86
  87 #endif /*__LINUX_IP_NETFILTER_H*/