1 #ifndef __LINUX_NETFILTER_H 2 #define __LINUX_NETFILTER_H 3 4 #include <linux/types.h> 5 6 #include <linux/sysctl.h> 7 #include <linux/in.h> 8 #include <linux/in6.h> 9 10 /* Responses from hook functions. */ 11 #define NF_DROP 0 12 #define NF_ACCEPT 1 13 #define NF_STOLEN 2 14 #define NF_QUEUE 3 15 #define NF_REPEAT 4 16 #define NF_STOP 5 17 #define NF_MAX_VERDICT NF_STOP 18 19 /* we overload the higher bits for encoding auxiliary data such as the queue 20 * number or errno values. Not nice, but better than additional function 21 * arguments. */ 22 #define NF_VERDICT_MASK 0x000000ff 23 24 /* extra verdict flags have mask 0x0000ff00 */ 25 #define NF_VERDICT_FLAG_QUEUE_BYPASS 0x00008000 26 27 /* queue number (NF_QUEUE) or errno (NF_DROP) */ 28 #define NF_VERDICT_QMASK 0xffff0000 29 #define NF_VERDICT_QBITS 16 30 31 #define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE) 32 33 #define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP) 34 35 /* only for userspace compatibility */ 36 /* Generic cache responses from hook functions. 37 <= 0x2000 is used for protocol-flags. */ 38 #define NFC_UNKNOWN 0x4000 39 #define NFC_ALTERED 0x8000 40 41 /* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */ 42 #define NF_VERDICT_BITS 16 43 44 enum nf_inet_hooks { 45 NF_INET_PRE_ROUTING, 46 NF_INET_LOCAL_IN, 47 NF_INET_FORWARD, 48 NF_INET_LOCAL_OUT, 49 NF_INET_POST_ROUTING, 50 NF_INET_NUMHOOKS 51 }; 52 53 enum nf_dev_hooks { 54 NF_NETDEV_INGRESS, 55 NF_NETDEV_NUMHOOKS 56 }; 57 58 enum { 59 NFPROTO_UNSPEC = 0, 60 NFPROTO_INET = 1, 61 NFPROTO_IPV4 = 2, 62 NFPROTO_ARP = 3, 63 NFPROTO_NETDEV = 5, 64 NFPROTO_BRIDGE = 7, 65 NFPROTO_IPV6 = 10, 66 NFPROTO_DECNET = 12, 67 NFPROTO_NUMPROTO, 68 }; 69 70 union nf_inet_addr { 71 __u32 all[4]; 72 __be32 ip; 73 __be32 ip6[4]; 74 struct in_addr in; 75 struct in6_addr in6; 76 }; 77 78 #endif /* __LINUX_NETFILTER_H */ 79
