include/uapi/linux/netfilter.h

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