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*/ 88